224028 Section 312-552-20A � Equipment Issue A 030-100940 Rev. D, July 2008 Westell� 3125-52 DS1 Network Interface Unit CLEI* Code: T1SMM055AA CONTENTS PAGE # 3125-52 DS1 NIU 1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 XMT O O U U 2. APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 T T M M 3. CIRCUIT/FUNCTIONAL DESCRIPTION . . . . . . . . 2 O O M M 4. OPTIONS & FEATURES . . . . . . . . . . . . . . . . . . . . . . . 6 II N N 5. INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 PWR 6. TESTING & TROUBLESHOOTING . . . . . . . . . . . . . 9 LB 7. CUSTOMER & TECHNICAL SERVICES . . . . . . . 11 RLOS 8. WARRANTY & REPAIRS . . . . . . . . . . . . . . . . . . . . . . 12 TLOS 9. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 MAN LB 1. GENERAL TP1 1.1 Document Purpose This document describes the Westell 3125-52 DS1 Network In- TP2 terface Unit (NIU), shown in Figure 1. Table 7 lists other II models in the same product family. N N M M O O 1.2 Document Status M M O O Whenever this practice is updated, the reason will be stated in U U T T RCV this paragraph. Revision D updates the company contact infor- mation. Revision C updated the description of S3 in Figure 9 A90-312552 and includes a format update. Revision B updated the S4 silks- Figure 1. Front View of 3125-52 creen labels. 1.3 Product Purpose and Description that are available in both backboard (wall) and rack mount ver- sions for NIUs. In some applications it may be desirable to The Westell 3125-52 DS1 Network Interface Unit (NIU) serves situate the NIU in outside plant (OSP) cabinets or enclosures. as the network interface between a T1 metallic span (or other The NIU is fully qualified for operating over the temperature DS1 facility) and the Customer Premises Equipment (CPE). range of -40 to +65°C (temp hardened). For these applica- The primary purpose of the NIU is to provide a maintenance tions, Westell also offers a range of pre-wired compact OSP loopback for T1 facilities. The 3125-52 can be optioned to ei- enclosures. ther regenerate or pass the T1 bit stream in the transmit and/or receive paths. The NIU monitors the incoming T1 bit stream for control codes from the network and takes the appropriate 1.5 Product Features action, such as loopback, upon detecting these codes. These The 3125-52 NIU offers the following features. codes can be either inband patterns or bit-oriented messages � Adjustable transmit-path signal limiter protects the net- in the ESF Facility Data Link. work from cross talk or regenerator overload due to mis-optioned CPE LBO 1.4 Product Mounting The 3125-52 is half the width of a standard 400-type NIU and � Remote Loopback activation/deactivation via inband mounts in a 200 MECHANICS� mounting assembly or shelf. loop up/loop down codes or can be controlled locally via The NIU makes electrical connection to the Facility and CPE front panel push button switch sides of the circuit through a 56-pin card-edge connector on the mounting assembly using industry-standard pin assignments. � Automatic detection of unframed, SF or ESF framed loopback codes The NIU mounting assembly is usually mounted on an equip- ment backboard at the customer location, after the building � Regenerates the T1 bit stream while in loopback entrance terminal and primary protection. Westell offers a wide range of single and multiple-slot mounting assemblies � Loopback path Line Build Out of 0, 7.5, 15 or 22.5 dB �Copyright 2008 Westell, Inc. All rights reserved. 0807IARD *CLEI is a trademark of Telcordia Technologies. 200 MECHANICS� is a registered trademark of Westell, Inc. Page 1 of 12 Section 312-552-20A 030-100940 Rev. D � 22.5dB 7.5dB 15dB Network LINE Interface NIU RPTR 1dB CPE Figure 2a. Maximum Section Loss with XMT & RCV Regenerators Out 30dB 15dB 7.5dB Network LINE NIU Interface RPTR CPE Figure 2b. Maximum Section Loss with XMT & RCV Regenerators In Figure 2. Typical Application 2.1 Transmission Design, REGEN Disabled � Loopback Timeout feature of 60 minutes; Can be disabled locally via switch or remotely via control codes Normal design parameters allow from 0 to 15 dB of loss from the last repeater in the span to the network interface, and a � Continuously monitors the transmit (customer-side) and maximum of 7.5 dB of loss for internal wiring to the CPE. This receive (facility-side) paths for loss of signal represents a total loss of 22.5 dB as shown in Figure 2a. � Unit can be configured to enter loopback or send AIS 2.2 Transmission Design, REGEN Enabled (Alarm Indication Signal) or CDI (Customer Disconnect If the maximum loss objectives described in Paragraph 2.1 can- Indication) toward the network upon detecting a loss-of- not be achieved, the NIU provides the option to regenerate the signal in transmit path; Feature can be overridden or signal in the transmit and/or receive paths. In this mode the changed remotely via codes NIU additionally functions as the �last span repeater", allow- ing the loss from the previous repeater to the NIU to be up to � Powered from the span or from an external local supply 30 dB. � Operates over the -40 to +65° C range allowing use in out- - NOTE - side plant cabinets and enclosures Local design practices or other span design considerations may restrict this loss to less than 30 dB. The NIU with Regenerator IN � Internal per-circuit fusing is shown in Figure 2b. � Front-panel test points for measuring span current 2.3 Power � Front-panel LED indicators for: The NIU can be powered either from the T1 span or from a lo- cal external supply. When span powered, the NIU has a � PWR (Power - green LED) nominal voltage drop of 15 Volts (250 Ohms at 60 mA). When locally powered, the external supply should be capable of sup- � LB (Loopback - yellow LED) plying 22 to 56 Vdc and can be positive or negative ground � RLOS (Receive Loss Of Signal - red LED) referenced. This allows the NIU to operate from +24 Vdc sup- plies at certain wireless and PCS (personal communication � TLOS (Transmit Loss Of Signal - red LED) service) sites. In the local power mode, the NIU completes the � Monitor jacks on the input ports T1 span simplex power loop and drops negligible span voltage. � Breaking-type access jacks on all ports 3. CIRCUIT/FUNCTIONAL DESCRIPTION 3.1 Normal Operation 2. APPLICATIONS The following paragraphs describe the operation of the NIU The 3125-52 NIU has several applications, as described in the during normal operation. Figure 3 provides a simplified view following paragraphs. The 3125-52 provides a maintenance in- of the circuit during normal operation and should be referred terface between the DS1/T1 facility and the customer to during this discussion. For additional details refer to interface, see Figure 2. It also provides loopback and local test Figure 8, the 3125-52 Block Diagram. access to aid in sectionalizing telco span vs. CPE problems. The 3.2 Receive Path NIU can be configured to be passive to the DS1 signal or can be configured as the last repeater in the span and regenerate The receive bipolar T1 bit stream from the facility enters the the DS1 signal. NIU on the RCV IN port, through an overvoltage protection 0807IARD 2 030-100940 Rev. D Section 312-552-20A � RCV OUT RCV MON IN RCV RCV REGEN DISABLE 7 T CT1 5 S4-2 RCV RCV ENABLE IN OUT 13 R CR1 15 CUSTOMER TELCO RCV LOS CONTROL CODE NETWORK RLOS T1/DS1 DETECTOR INTERFACE DETECTOR FACILITY XMT LOS TLOS (CPE) DETECTOR DISABLE 41 T1 SIGNAL XMT CT 55 LIMITER OUT ENABLE S1 XMT 47 R1 IN CR 49 XMT S3 REGEN 0 7.5 15 SIGNAL LIMITER XMT OUT XMT IN XMT MON Figure 3. Transmission Path During Normal Operation RCV RCV MON RCV IN OUT LOOPBACK REGEN 7 T CT1 5 RCV RCV IN OUT 13 R CR1 15 RCV LOS CONTROL CODE RLOS TLOS CUSTOMER DETECTOR TELCO DETECTOR NETWORK T1/DS1 INTERFACE FACILITY (CPE) XMT LOS DETECTOR DISABLE 41 T1 SIGNAL XMT LBO CT LIMITER 55 OUT ENABLE S1 XMT 47 R1 IN 7.5 15 CR 49 S3 XMT S2 REGEN 0 7.5 15 0 0 SIGNAL LOOPBACK LIMITER LBO XMT OUT XMT IN XMT MON Figure 4. Transmission Path During Normal Loopback Operation circuit and is transformer coupled to the receive path circuitry. a loss-of-signal detector. If a loss of signal is detected in the The receive path is continuously monitored for loss of signal transmit path for more than 150 ms, a loss-of-signal condition and control codes by the detectors as shown in Figure 3. If a loss is declared and the front-panel TLOS LED lights. of signal is detected in the receive path for more than 150 ms, a loss-of-signal condition is declared and the front-panel 3.5 Transmit Channel Regeneration RLOS LED lights. The NIU provides the option of regenerating or transparently passing the transmit path signal toward the facility. The trans- 3.3 Receive Channel Regeneration mit path regenerator feature is controlled by switch S1, XMT The NIU provides the option to either regenerate or transpar- REGEN. ently pass the incoming T1 signal toward the customer network - NOTE - interface. This feature is controlled by option switch S4-2, RCV REGEN. The output is then transformer coupled to the RCV When the XMT REGEN is set to IN, the Signal Limiter circuit must be set to 0. OUT port. 3.4 Transmit Path 3.6 Signal Limiter The T1 bit stream from the CPE is routed into the NIU via the The Signal Limiter limits the peak amplitude of the transmit XMT IN port. The transmit path is continuously monitored by path signal to the facility. It effectively prevents far-end cross 0807IARD 3 Section 312-552-20A 030-100940 Rev. D � RCV RCV MON RCV IN OUT RCV 7 T REGEN CT1 5 RCV RCV IN OUT 13 R CR1 15 CDI/AIS RCV LOS CONTROL CODE RLOS TELCO DETECTOR GENERATOR TLOS CUSTOMER DETECTOR T1/DS1 NETWORK INTERFACE FACILITY CPE XMT LOS DETECTOR 41 T1 CT 55 SIGNAL XMT XMT LBO LIMITER OUT IN 47 R1 CR 49 7.5 15 S3 S2 0 0 0 7.5 15 SIGNAL LOOPBACK XMT IN XMT MON XMT OUT LIMITER LBO Figure 5. Transmission Path During a TLOS-(AIS/CDI) talk and over driving of the last span repeater in situations 3. automatically, when the NIU detects a loss of signal from where the LBO in the customer CSU is set incorrectly. The Sig- the CPE (S6 dependent). nal Limiter has no affect on the customer signal when the CSU LBO is set correctly. The Signal Limiter is controlled by S3, and 3.8.1 Remote Loopback Operation limits the signal as shown in Table 1. These limits are approxi- Remote loopback activation/deactivation is done from a test mate and are also dependent on the signal’s ones-density and center by sending inband or ESF control codes toward the test set type. NIU. See Table 2. The output of the Signal Limiter is transformer coupled toward Function Code Sequence Type the facility via the XMT OUT port. Activate 11000 Unframed, SF or ESF (Loop-Up) S3 Setting Peak Voltage Limit Approx. Equivalent Level � 0001 0010 1111 1111 ESF Data Link 0 dB No Limit No Limit Deactivate 11100 Unframed, SF or ESF (Loop-Down) 7.5 dB 1.2 to 1.5 V -3 to -5 dBdsx � 0010 0100 1111 1111 ESF Data Link 15 dB 0.6 to 0.75 V -5.5 to -12 dBdsx 0001 0100 Unframed, SF or ESF 60 Minute Loopback � � Table 1. Signal Limiter Limits , 0010 1010 1111 1111 ESF Data Link Time-out Disable or � 0101 0100 1111 1111 ESF Data Link Notes: 1. Right-most bit first. 2. T-Berd, Sunrise, or similar test sets. 3. Phoenix test sets. 3.7 Loopback Table 2. Loopback Control Codes The loopback function is used during maintenance and circuit troubleshooting to verify the integrity of the DS1 facility up to 3.8.1.1 Inband Control Codes and including the NIU. The NIU performs a dual loopback, Inband codes are repetitive patterns at the 1.544 Mb rate and one is toward the T1 facility and the other is toward the custom- may be unframed, SF or ESF framed and must be applied for er equipment. These loopbacks are metallic and effectively a minimum of five seconds. verify all active components of the NIU. Figure 4 provides a simplified view of the circuit during loopback and can be re- 3.8.1.2 ESF Control Codes ferred to during this discussion. For additional details see ESF codes are bit-oriented messages in the ESF DataLink. The Figure 8. message must be received for a minimum of four consecutive error-free repetitions (approx. 16 ms). 3.8 Loopback Activation/Deactivation Loopback activation/deactivation can be accomplished by one 3.8.1.3 Dual Loopback Transmission Path of three ways: When in loopback, the received signal from the DS1 facility is regenerated to 0 dBdsx and passed through an LBO circuit that 1. remotely, via control codes in the DS1 signal from a net- provides 0, 7.5, 15 or 22.5 dB of loss to meet T1 facility design work test location, requirements. During loopback the customer signal is also 2. locally, via the front-panel MAN LB push button switch, or looped back toward the customer as shown in Figure 4. 0807IARD 4 030-100940 Rev. D Section 312-552-20A � 3.8.1.4 Loopback Timeout 3.8.3.2 TLOS AIS (S6-AIS) With S6 set to AIS, the NIU, upon detecting a loss of signal During a code-activated loopback, the unit provides a Loop- from the CPE, will light the TLOS LED and send an unframed back Timeout feature, controlled by switch S4-1, that all ones-signal AIS toward the network as shown in Figure 4. automatically releases the unit from loopback after 60 minutes. When the CPE signal is restored the NIU will return to normal During a timed loopback condition, the LB LED will flash. (idle) operation. Loopback can be released prior to the 60-minute timeout expi- ration period by sending loopdown code or by pressing the 3.8.3.3 TLOS CDI (S6-CDI) front-panel MAN LB switch, S5. With S4-1 set to disable, the With S6 set to CDI, the NIU, upon detecting a loss of signal NIU will remain in loopback until a loop-down code is received from the CPE, will light the TLOS LED and send a CDI code or until the MAN LB switch is pressed. When the Loopback toward the network as shown in Figure 5. When CPE signal is Timeout feature is disabled, and the unit is put into loopback, restored, the NIU will return to normal operation. The specific the LB LED will be lit continuously. type of CDI signal sent toward the network is a function of the DS1 signal received from the network. - NOTE - � If the received signal is SF, the CDI signal will be SF and The Loopback Timeout can also be disabled remotely via con- trol codes. provide a 0001 0111 repeating pattern in each of the 24 DS0 time slots, 3.8.1.5 Remote Loopback Timeout Disable � If the received signal is ESF, the CDI signal will be ESF and The Loopback Timeout feature can be remotely disabled if provide a 0001 0111 repeating pattern in each of the 24 testing will exceed the 60-minute expiration period. When in DS0 time slots. In addition, the ESF Data Link will contain loopback, the timeout feature is disabled by sending the SF the ESF yellow alarm signal 1111 1111 0000 0000, inter- code 0001 0100 or the ESF code 0010 1010 1111 1111. The NIU rupted each second with a 100ms burst of LAPD idle code will now remain in loopback until a loop down code is sent or 0111 1110, until the MAN LB switch is pressed. � If no signal is received from the network or if the signal is unframed, the NIU will default to the SF CDI mode. 3.8.2 Manual Loopback The NIU can be placed into loopback manually by pressing the 3.8.3.4 TLOS LB/CDI/AIS Mode front-panel MAN LB switch, S5. When the NIU is placed in When the NIU enters one of the TLOS modes (LB, AIS or manual loopback, the loopback will not timeout regardless of CDI) due to a loss of signal from the customer, the NIU will as- the setting of S4-1 and will remain in loopback until S5 is sume the transmission path as shown in Figure 4 (for loopback) pressed a second time or until loopdown code is received. or Figure 5 (for either AIS or CDI). At this point, the test per- son can: 3.8.3 Loss of Signal from Customer Interface 1. Take no action. When the customer signal is restored the The NIU continuously monitors the DS1 signal from the CPE NIU will return to normal operation. for loss of signal. Upon detecting a loss of signal in the transmit path (TLOS), the front-panel TLOS LED will light and the 2. Send a loop-down code. This will place the NIU into a NIU will automatically perform one of the following: TLOS override mode and allow testing through the NIU to the customer interface. Also, while in the TLOS Over- 1. activate loopback, ride mode, a 60-minute TLOS timer is activated. 2. send CDI toward the network, or 3. Send loop-up code. This will cause the NIU to enter the normal loopback mode. 3. send AIS toward the network. The specific action taken on a TLOS is dependent on the set- 3.8.3.5 TLOS Override Mode ting of S6 and each action is described in detail in the following When in the TLOS Override mode, TLOS LED will be lit and paragraphs. the unit will assume the transmission paths as shown in Figure 3. At this point, the test person can: - NOTE - 1. Take no action. When customer signal is restored or The NIU can be remotely queried to determine the present setting when the 60-minute TLOS timer expires, the NIU will of the TLOS mode as well as remotely toggled to change the set- return to idle. If the NIU enters the idle via timeout and ting/configuration. See paragraphs 3.8.3.7 through 3.8.3.8 and the CPE signal is still absent, the NIU will revert to the Figure 6 for details. selected TLOS LB/AIS/CDI mode. 3.8.3.1 TLOS Loopback (S6-LB) 2. Send loop-up code. This will cause the NIU to enter the normal loopback mode of operation. With S6 set to LB, the NIU, upon detecting a loss of signal from the CPE, will enter the loopback state as shown in Figure 4 and 3.8.3.6 Normal Loopback from TLOS Override Mode light the LB and TLOS LEDs. When in the TLOS Loopback mode, loopback will not time out nor can it be manually re- When in normal loopback, the 60-minute loopback timer is ac- leased via the front-panel MAN LB push button. When the tivated, the LB LED will be flashing, the TLOS LED will be lit CPE signal is restored, the NIU will return to normal (idle) op- steady and the unit assumes the transmission path as shown in eration. Figure 4. At this point the test person can: 0807IARD 5 Section 312-552-20A 030-100940 Rev. D � 1. Take no action. NIU will remain in loopback indefinitely - NOTE - if loopback timeout S4-1 is OFF, or return to idle mode Set any/all manual option switches prior to installing the unit. after 60 minutes if S4-1 is enabled. If, after the 60-minute timer expires, the CPE signal is still absent the unit will revert to the TLOS LB/AIS/CDI mode. 4. OPTIONS & FRONT PANEL FEATURES 2. Send loop-down code. This will return the NIU to idle. If The 3125-52 NIU contains various features and switch options the CPE signal is still absent the unit will revert to the located on the front and side (PCB) panels, as shown and de- TLOS LB/AIS/CDI mode. scribed in Figure 9, to condition the module for proper operation and for maintenance and testing purposes. 3.8.3.7 TLOS Remote Query The NIU provides the ability to remotely query the NIU to de- 4.1 Front Panel Features termine the loss of signal mode of operation as optioned by S6. To query the NIU, the test person must first send the loop up code. While in loopback, the test person then sends the inband 4.1.1 Status LEDs query code 0101 1101 0100 0001. The NIU contains four status LEDs. See Table 3 for a descrip- Response tion of the front panel LEDs and Figure 9 for their locations. 1. If optioned to enter loopback upon a TLOS condition, the NIU will remain in loopback. LED LED LED Label Color State LED Description 2. If optioned to send AIS upon a TLOS condition, the NIU Green Off Power not applied to unit, P5 is op- will return AIS toward the network. tioned incorrectly for power source being used, or unit has failed, open- 3. If optioned to send CDI upon a TLOS condition, the PWR ing its internal power fuse. NIU will return CDI toward the network. On Power is applied to unit. The NIU will return the response for as long as it is receiving Flashing NIU is powered and TLOS mode is remotely toggled to a state different the query code. To exit the query state and return the NIU to from that set via S6. normal mode, send loopdown code to the NIU. Yellow Off NIU is idle or in normal operation (i.e., LB not in loopback). 3.8.3.8 TLOS Remote Toggle On NIU is in loopback and 60-minute The NIU also provides the capability to remotely override and timeout mode is disabled. change the TLOS mode set by S6. When remotely changed, the Flashing NIU is in loopback and 60-minute NIU will continue to operate in this new mode even if power is timeout mode is enabled. lost. When the NIU has been remotely programmed to a differ- Red On NIU detects a loss of signal from the ent response other than that set by S6, the PWR LED will flash. RLOS network. To remotely override the TLOS mode set by S6: Off NIU is receiving signal from the net- work. 1. Send the loop up code. On NIU detects a loss of signal from the Red TLOS customer interface. 2. Next, send the inband query code 0101 1101 0100 0001 Off NIU is receiving signal from the cus- continuously. The NIU responds with the present setting. tomer interface. 3. Remove the code for at least five seconds, then resend it. Table 3. Front Panel LED Conditions and States 4. The NIU will toggle to the next TLOS option. If this is not the desired response, repeat step 3 to toggle to the 4.1.2 Front Panel Push Button Switch next option state. A push button switch located on the front panel provides manu- 5. Send loopdown code to the NIU. This will then lock the NIU to the new TLOS option state. al loopback activation/deactivation. The switch is labelled �MAN LB" and is described and shown in Figure 9. 3.9 Power 4.1.3 Bantam Jacks The NIU offers a flexible powering option which will allow the The NIU contains breaking-type access jacks on all ports and unit to operate directly from T1 metallic spans, or from a local- monitor jacks on the input ports. See Table 4 for a description ly provided 22 to 56 Vdc source. When locally powered, the DC of these six jacks. source can be negative or positive ground referenced. This al- lows the unit to operate from conventional -48 Vdc sources as well as +24 Vdc source found in certain wireless/PCS applica- 4.1.4 Test Point Jacks tions. The NIU provides a fuse on its power input lead, pin 35. The NIU also contains test point jacks on the front panel which This fuse prevents the failure of an individual NIU from affect- ing other units on the same local power supply. This fuse is not allow a craftperson to measure span current. These signal-in- field replaceable. terrupting jacks are labelled TP1 and TP2, as listed in Table 4. 0807IARD 6 030-100940 Rev. D Section 312-552-20A � SEND START NIU LOOPUP IDLE CODE SEND 16-BIT INBAND QUERY CODE 0101 1101 0100 0001 NO CODE SENT FOR >5 SEC.? YES YES UNIT RESPONDS WITH CODE ABSENT NO PRESENT SETTING OF FOR >5 SEC.? TLOS OPTION CHANGE TLOS YES STOP NO OPTION TO NEXT IS THIS THE DESIRED SENDING CHOICE RESPONSE? CODE (LB/AIS/CDI)? YES NO NO SEND YES CODE SENT LOOPDOWN FOR >5 SEC.? CODE Figure 6. TLOS Query/Toggle Procedure TLOS LOOPUP CODE Override LOOPDOWN Mode 60 MINUTE TIME−OUT or CPE SIGNAL PRESENT CPE LOS TLOS Mode Idle Mode LB, AIS, CDI CPE SIGNAL PRESENT LOOPUP CODE 60 MINUTE TIMEOUT or LOOPDOWN CODE Normal LB LOOPUP CODE Mode Figure 7. Loopback/TLOS Override Diagram 0807IARD 7 Section 312-552-20A 030-100940 Rev. D � Figure 8. 3125-52 Block Diagram 0807IARD 8 Shield 34 38 RCV MON RCV IN RCV OUT FACILITY FROM RCV/LPBK CT1 LB T LB REGEN 5 7 DISABLE S4-2 LB RCV K1 RCV IN OUT ENABLE CR1 R LB LB 13 15 RLOS TO CPE CODE RCV LOS DETECTOR DETECTOR TP1 SPAN 10 CURRENT CDI/AIS OHMS LB GENERATOR TP2 LOCAL SPAN SYSTEM MAN LB S5 LB CONTROLER PWR P5 K1 (−) 35 LOCAL POWER S4 CPE PATH CONVERTER NETWORK POWER P5 S6 LOOPBACK -1 LB T.O. LOOPBACK (+) 17 -2 RCV RGN LB AIS CDI TLOS MODE LOCAL SPAN P5 LOCAL SPAN TLOS XMT LOS DETECTOR TO FACILITY FROM CPE T1 DISABLE 41 CT XMT 55 SIGNAL LB LB LBO OUT LIMITER K1 ENABLE XMT S1 R1 IN 47 XMT CR 7.5 15 49 REGEN S3 LB LB S2 0 7.5 15 0 0 SIGNAL LOOPBACK LIMITER LBO XMT OUT XMT XMT IN MON Shield 1 36 39 SURGE SURGE PROTECTION PROTECTION 030-100940 Rev. D Section 312-552-20A � 5.1 Mounting the Module Jack Jack Description Type Name Before installing the NIU, please observe all safety notes and RCV MON Monitors the RCV IN signal from the cautions and set all option switches to their desired positions network. (see Part 4). RCV IN Breaks signal from the network and pro- vides access to RCV IN port of NIU. The NIU installs in a 200 MECHANICS� or 400-type shelf or mounting assembly. Align the module with the mounting as- RCV OUT Breaks signal from the network and pro- vides access to RCV OUT port of NIU. sembly card guides above and below the module and insert as Bantam Jacks far as it will go into the slot connector. XMT MON Monitors the XMT IN signal from the customer interface. - CAUTION - XMT IN Breaks signal from the customer interface and provides access to XMT IN port of Use care when installing and removing modules - do not force NIU. a module into place. If a module resists insertion, remove it and check for obstructions in or near the connector and XMT OUT Breaks signal from the customer interface and provides access to XMT OUT port of mounting slot, then carefully re-align and re-insert the unit. NIU. Used for measuring span current. Voltage Function Designation Pin Number Test Span Curr measured across these points should be Points TP1, TP2 between 0.57 and 0.63 V which equates to RCV IN T 7 57 to 63 mA of span current. RCV IN R 13 Table 4. Front Panel Test Jacks RCV OUT CT1 5 RCV OUT CR1 15 4.2 PCB Option Switches (Side Panel) XMT IN CT 55 The 3125-52 NIU contains option switches and jumpers on the XMT IN CR 49 side-panel PCB to option the unit for proper operation. The XMT OUT T1 41 location and description of each option is shown in Figure 9. XMT OUT R1 47 Shield 34/38 5. INSTALLATION Shield1 36/39 Installation consists of inspecting the equipment for damages, (-) Local Power 35 POWER following proper safety precautions, mounting the NIU in the proper slot of the mounting assembly, and verifying the pres- (+) Local Power 17 ence of power and signalling as indicated by the status LEDs Table 5. Pin/Lead Designations (see Table 3). 5.2 Making Installer Connections - INSPECTION NOTE - If not previously inspected at the time of delivery, visually inspect The unit makes electrical connection to external equipment the unit for damages prior to installation. If the equipment has through a 56-pin, wire-wrap card-edge connector in the mount- been damaged in transit, immediately report the extent of the ing assembly. Pin connections (pin-outs) are listed Table 5. damage to the transportation company and to Westell (see Part 6 for telephone number). 6. TESTING & TROUBLESHOOTING - PRECAUTIONARY STATEMENT - 6.1 Testing Never install telephone wiring during a lightning storm. After installation is complete, initial testing consists of follow- Never install telephone jacks in wet locations unless the jack ing the steps in Table 6. This equipment should not be field is specifically designed for wet locations. repaired. If the equipment is suspected of being faulty, replace Never touch uninsulated telephone wires or terminals unless it with another unit, optioned identically, and retest. If the re- the telephone line has been disconnected at the network placement unit appears to operate correctly, the original unit interface. may be faulty and should be returned to Westell for repair or replacement (Paragraph 8.2). Use caution when installing or modifying telephone lines. This NIU should be installed behind devices that provide 6.2 Troubleshooting primary lightning protection. If trouble is encountered, verify all installer connections to the assembly and check that the CO power fuse is not blown. Also CAUTION - STATIC-SENSITIVE verify all module connections and option switch settings, and This product contains static-sensitive components! Proper verify the modules are making a positive connection with the electrostatic discharge procedures must be followed to shelf connector. If trouble persists, replace the suspect unit and maintain personal and equipment safety. Do not store units repeat procedures outlined. These procedures are not de- near magnetic, electromagnetic or electrostatic fields. Always signed to effect repairs or modifications. Any tests beyond store or ship units in the original static-protective packaging those outlined herein, or repairs made beyond replacing a from Westell. Use anti-static mats when working on units. faulty unit, are not recommended and may void the warranty. 0807IARD 9 224028 Section 312-552-20A 030-100940 Rev. D � 3125-52 DS1 NIU XMT O O U U SIG LMTR T T S3 0 S2 M M O O LBO M M 7.5 LOC SPAN II 15 7.5 N N 15 22.5 PWR ENABLE LB P5 RLOS XMT TLOS RGN S1 MAN S5 DISABLE LB S6 TLOS MODE TP1 TP2 II N N M M O O M M O O U U -2 T T -1 RCV A90-312552 Description Option Position SPAN Configures the unit to operate from the T1 facility span power. P5 Jumper LOC Configures the unit to operate from a local 22 to 56V power supply. ENABLE Regenerates the DS1 signal from the customer interface to the network. S1 NOTE: When this option is selected, ensure S3 (Signal Limiter) is set to 0. XMT Regen DISABLE Transparently passes the DS1 signal from the customer interface to the network. 0, 0 Set both segments up (away from values shown) to obtain 0dB of loss in the loopback path. Set left segment up (away from value shown) and right segment down (toward value shown) to S2 0, 7.5 obtain 7.5dB of loss in the loopback path. (2 section) LB LBO Set left segment down (toward value shown) and right segment up (away from value shown) to 15, 0 obtain 15dB of loss in the loopback path. 7.5, 15 Set both segments down (toward values shown) to obtain 22.5dB of loss in the loopback path. 0 Does not limit signal from customer interface to network. S3 7.5 Limits signal from customer interface to network to approx. 1.3 V peak. Signal Limiter Limits signal from customer interface to network to approx. 0.7 V peak. 15 Enables 60-minute Loopback timeout feature for code-activated loopback. A flashing LB LED ENABLE S4-1 indicates LB T.O. timer is activated. T.O. LB DISABLE Disables 60-minute Loopback timeout feature; Loopback can still be activated but with no the time out. ENABLE Regenerates the DS1 signal from the network to the customer interface. S4-2 RCV Regen DISABLE Transparently passes the DS1 signal from the network to the customer interface. S5 PUSH/ Push once to activate loopback manually. Press a second time to deactivate loopback. PUSH MAN LB LB Configures unit to enter Loopback upon detecting loss of signal from customer interface. S6 AIS Configures unit to send AIS code toward network upon detecting loss of signal from customer interface. TLOS Mode Configures unit to send CDI code toward network upon detecting loss of signal from customer interface. CDI Figure 9. 3125-52 Front Panel and Switch Options 0807IARD 10 ENABLE S4 RCVRGN LBTO LB AIS CDI 0 030-100940 Rev. D Section 312-552-20A � IF CORRECT RESULT STEP PROCEDURE CORRECT RESULT IS NOT OBTAINED 1 Option and install unit PWR LED and TLOS LED should be ON. If span powered, verify P5 is set to Ensure connections to the DS1 are If optioned for TLOS-LB, the LB LED will also SPAN. Place a voltmeter across the made properly, and the connections to be ON. 2 XMT & RCV pairs and verify reading the customer network interface are of approx. 15 V disconnected RLOS LED may be ON or OFF depending on the status of any signal from the network Inject a QRSS signal into unit locally via RCV IN jack at the level specified 3 RLOS LED should be OFF NIU may be faulty, replace and retest on the CLR/WORD document. If no level is specified, use -15 dB If RCV REGEN (S4-2) is Disabled, signal NIU may be faulty, replace and retest should be same as injected signal +0 to -1 dB Measure the signal at the RCV OUT 4 jack with a terminated test set If RCV REGEN (S4-2) is Enabled, signal NIU may be faulty, replace and retest should be 0dBdsx �1.5 dB 5 Press the front panel MAN LB switch Verify LB LED is ON steady NIU may be faulty, replace and retest Verify LB LED is OFF 6 Press the front panel MAN LB switch NIU may be faulty, replace and retest Change the signal at the RCV IN jack Verify LB LED is ON steady or flashing 7 NIU may be faulty, replace and retest to loop up code for at least 5 seconds, (dependent on the setting of S4-1, LB T.O.) then return to QRSS Signal should be the level that was set via LB Move test set receiver from RCV OUT 8 NIU may be faulty, replace and retest LBO switch S2 (ex: If S2 is set for 15 dB, the level jack to the XMT OUT jack and measured should be -15dB �1.5 dB) measure the level Change signal at RCV IN jack to loop Verify LB LED is OFF 9 NIU may be faulty, replace and retest down code for at least 5 seconds, then return to QRSS Inject a QRSS signal into unit locally via XMT IN jack at the level specified 10 TLOS LED should be OFF NIU may be faulty, replace and retest on the CLR/WORD document. If no level is specified, use -15 dB If XMT REGEN (S1) is Disabled, signal should NIU may be faulty, replace and retest be same as injected signal +0 to -1 dB Measure signal at XMT OUT jack 11 Be sure Signal Limiter is set to 0. with a terminated test set If XMT REGEN (S1) is Enabled, signal should Otherwise, NIU may be faulty. be 0dBdsx �1.5 dB Replace and retest TLOS LED should be ON NIU may be faulty, replace and retest If TLOS Mode (S6) is set for LB, verify LB LED NIU may be faulty, replace and retest is ON steady Change QRSS signal at XMT IN If TLOS Mode (S6) is set for AIS, verify test NIU may be faulty, replace and retest 12 jack to -30 dB set sees AIS code at the XMT OUT jack If TLOS Mode (S6) is set for CDI, verify test set NIU may be faulty, replace and retest sees CDI code with SF framing at the XMT OUT jack NOTE: The procedures above tests the functionality of the NIU only. Please follow local Methods & Procedures to ensure span integrity. The above procedures can be done locally to verify operation of the NIU. These procedures do not verify the integrity of the T1 facility and does not require coordination with the remote test center. Table 6. Test Procedures 7. CUSTOMER & TECHNICAL SERVICES Voice: (800) 377-8766 email: global_support@westell.com 7.1 Customer Service & Technical Assistance If technical or customer assistance is required, contact Westell For additional information about Westell, visit the Westell by calling or using one of the following options: World Wide Web site at http://www.Westell.com. 0807IARD 11 Section 312-552-20A 030-100940 Rev. D � 7.2 Part Numbers 9.3 Electrical and Physical Specifications This equipment is identified by a model number and issue let- The electrical and signalling specifications are listed below, ter imprinted on the front panel (A90-312552). Each time a and the physical specifications are shown in Table 8. change is made to the product which changes the form, fit or function of the product, the issue letter, indicated by the prefix Physical Feature U.S. Metric letter of the assembly number (A90), is advanced. Be sure to in- Height 5.6 in. 14.2 cm dicate the issue level and model number when making inquiries Width 0.7 in. 1.8 cm about the equipment. Depth 6.0 in. 15.1 cm Weight (approx.) 6 oz. 170.1 g 8. WARRANTY & REPAIRS Operating Temp. -40° to 149°F -40° to 65°C 8.1 Warranty Humidity 0 to 95% (non-condensing) Westell warrants this product to be free of defects at the time Mounting Mounts in any 200 MECHANICS� or of shipment. Westell also warrants this product to be fully func- 400-type mechanics mounting or shelf. tional for the time period specified by the terms and conditions Table 8. Physical Specifications governing the sale of the product. Any attempt to repair or modify the equipment by anyone other than an authorized Westell representative will void the warranty. Transmission 8.2 Repair and Return A. XMT Channel Insertion Loss (REGEN OFF): 1.5 dB, max. Westell will repair or replace any defective Westell equipment without cost during the warranty period if the unit is defective B. RCV or XMT Channel Regeneration Range: -31 to for any reason other than abuse, improper use, or improper 0 dBdsx installation. To return defective equipment, first request a Re- turn Material Authorization (RMA) number from Westell by C. Port Impedance: 100 Ohms (±22 %) at 772 kHz calling or using one of the options shown below. Once an RMA Detectors number is obtained, return the defective unit (freight prepaid), along with a brief problem description, to the address we will D. Receive Loss Of Signal Detector (RLOS) Thresh- provide to you when you contact us. old: 175 (±75) consecutive zeros � -31 dBm dsx Voice: (630) 375-4457 E. Transmit Loss of Signal Detector (TLOS) Thresh- email: rgmdept@westell.com old: 175 (±75) consecutive zeros � -24 dBm dsx Replacements will be shipped in the fastest manner consistent with the urgency of the situation. Westell will continue to repair F. Loopback Activation Codes: or replace faulty equipment beyond the warranty period for a � Inband (unframed, SF framed): 11000 (>5 sec.) nominal charge. Contact Westell for details. � ESF: 0001 0010 1111 1111 (right-most bit first) 9. SPECIFICATIONS G. Loopback Deactivation Codes: 9.1 Regulatory/Agency Specifications � Inband (unframed, SF framed): 11100 (>5 sec.) The NIU is designed to meet the following regulatory and envi- � ESF: 0010 0100 1111 1111 (right-most bit first) ronmental specifications or requirements: H. Loopback Timeout Disable Codes: � UL 1459 Recognized Component � Inband: 0001 0100 (>5 sec.) � Lightning and Power Cross: Meets require- ments of Bellcore GR-1089 CORE � ESF: 0010 1010 1111 1111 (right-most bit first) � FCC Part 15 (emissions and susceptibility) � ESF: 0101 0100 1111 1111 (right-most bit first) � TR-TSY-000312 I. Code Detector Range: -31 to 0 dBdsx 9.2 Ordering Specifications -3 J. Code Detector Maximum Error Rate: 10 To order units, call the telephone numbers shown in Paragraph Power 7.1 and please specify a specific model number shown in K. Span Power Voltage Drop: 15 V nominal at 60 mA Table 7. L. Span Power Operating Current Range: 57 to 63 mA Model # Part # Description 3125-52 A90-312552 DS1 Network Interface Unit.. CLEI* Code: M. Local Power: 22 to 56 Vdc, ± reference to ground T1SMM055AA. Barcode/ECI: 224028. CPR: J70795. *CLEI is a trademark of Telcordia Technologies. N. Local Power Current Consumption: 66 mA, max. Table 7. Ordering and Option Information O. Heat Release: 3.5 Watts, max. 0807IARD 12