XT XT AM48 & AM48e Family of Products XT AM-44 The AM-4 Series of Hand-Held Transmission Test Sets There are four models in the AM-4 series family. XT XT They are AM-44 and AM-48 which comply with Bell Pub. 41009 and IEEE 743-1984 and the model XT XT AM-44e and AM48e which comply with ITU-T recommendations for most international applications. All units have the same physical size. XT The AM-44 has a built-in dial keypad for dial pulse, touch tone and MF dialing, plus, P/AR send XT and measure functions. Using the AM-44 you can achieve measurements up to 5000Hz. XT At the top of the line, the AM-48 includes all XT XT AM-48 features of the AM-44 and combines the transient XT test functions AM-44 necessary to test both voice and high-speed data lines. XT The AM-48 has an extended bandwidth of 20kHz and performs all the tests most often required when testing transmission quality on analog lines. The AM-4 series product line offers service personnel, engineers, and technicians the means to quickly and conveniently test for transmission impairments on two and four wire analog voice and data facilities. Below is a feature comparison of the available units: Here’s Everything Yo Battery compartment Speaker (4 "AA" size batteries) Flip up wire stand Permanent on/Auto Shut-off and power off Switch Speaker Volume control Display selection of measurement Speaker Monitor (absolute or relative) selection and push or send to talk Damping of display refresh rate High Impedance Bridge/Terminate Filter select Switch Measure select On Hook/off Hook/ Send select Pulse-Tone Switch Tone dialing selection/ secondary keypad Terminate Impedance function select Selection 2 Wire/ 4 Wire 2713 Hz Send/SF skip 4 Wire Rev Switch switch Microphone Store/recall and print switch Rugged injection molded case Dual Bantam Dial and parameter Connectors for send entry keypad and receive pairs AC Wall Adaptor RJll line connector Unit shown is actual size, You Need In An Analog Tr XT The AM-48 is a powerful hand-held Simple Operation Transmission Impairment Test Set. Through the use XT XT of surface mount technology the AM-48 incorpo- The hand-held AM-48 is easily operated. Simply rates measurement capability and features use the color-coded controls and menu selection to unmatched. choose the desired measure mode and send mode. The proper units of measurement are automatically displayed and the autoranging measurement circuitry Designed for field testing of voice and data on 2 or automatically 4 wire telecommunications transmission circuits over the extended voice band (200 Hz to 20 kHz), the XT AM-48 fully complies with IEEE 743-1984 (Bell XT Standard 41009). The Model AM-48e is the export version and fully complies with world standard ITU-T recommendations. Large easily-read LCD with simultaneous display of test The unit is actually three instruments in one: set-up menu and measurement. It is a measurement set able to measure: displays the reading. If the measurement is out of • dBm level or dB loss • Noise with Tone • Frequency • Signal/Noise Ratio range, the display will indicate "over" or "under." • Frequency Response • P/AR (Attenuation • 3 Level Impulse Noise All controls are edge-mounted rocker switches or Distortion) • Phase and Gain Jitter slide switches with descriptive labeling on the front • Noise • Hits and Dropouts of the unit for all switch functions. It is a full function signal generator able to The keypad, normally used for dialing, has a generate all of the test tones and waveforms needed secondary function which allows setting of all control to perform the above-listed measurements. parameters associated with the more complex tests. The keypad also allows setting of signal generator It is a telephone set with dial, talk and listen levels and frequencies. capability. As an added convenience, there is a mini instruc- tion manual on the back of the unit to act as a The unit is memory jogger operation guide. furnished com- plete with alka- line batteries, Store and Recall AC adapter, A user-programmable, non-volatile memory is input cord, and contained within the unit. It allows up to ten instruction operator-defined send/measure test configurations to manual. be stored as well as up to ten operator-defined test Optionally tone frequencies. Any of these can be recalled by a available are single keystroke thereby greatly simplifying opera- soft carrying tion of the unit. case and a wide selection of input cords. ransmission Test Set Compact Convenience XT About the size of a calculator, the AM-48 weighs 23 ounces. Carry it in your briefcase, in your tool kit or even in your pocket. It is powered by four size AA alkaline batteries or an accessory AC adaptor. With its built-in stand/hang bale, the unit can be propped on a table or hung from a hook. You can take it anywhere and it will always be available when you need it. Built-In Telephone Set With its selection of 600 or 900Ohm termination impedances as well as high impedance bridge capa- bility, the unit can be used in a variety of applica- XT tions. A unique feature of the AM-48 is the built-in dialing capability. The unit can signal with dial pulse, tone (DTMF) or MF. This feature, combined with the built-in DC hold circuit and speaker/ microphone, enables one tester to communicate with another over the line under test. No need for a second communica- tions line and no need for an external "butt" set (field telephone set). XT Use the AM-48 built-in dial capability on dial-up XT networks to access a second AM-48 for centralized 2-wire testing. Use a single unit for centralized loopback testing. Use two sets for a complete end-to-end test of 4-wire data lines. XT AM-48 Technical Specification Quiet: In quiet mode the line is terminated Dropout threshold is -12 dB from the with a passive resistance equal to the initial level of the holding tone. A GENERAL line impedance. Also, when in quiet. dropout will be counted if the Characteristics Specifications one of 10 user programmable tones holding tone drops below the threshold may be momentarily applied to the for at least 4 ms ± .5 ms. Counting of Measurements: Level (dBm), loss (dB relative) line by depressing the 0 9 keys. dropouts, gain hits, phase hits, and Frequency (Hz) Programmable from this mode impulses is inhibited for a blanking Noise (dBrn) with 3 kHz flat, are (1) Touch Tone dial Level interval which lasts until 1 second 15 kHz/ flat, (, to - 50.0 dBm), after the holding tone is restored to a CMsg, or Program filter. (2) Power Auto Time Off (1 to 255 level above the dropout threshold. Notched Noise with 1010 Hz notch minutes), (3) impulse and transient and any of above noise-weighting test Blanking Interval (1 to 255 ms) Gain Hit threshold can be 2, 3, k or filters. and (4)10 user-programmable tones 6 d B. A gain hit will be counted if Signal - to -Noise ratio (dB) for later instant recall. the level of the holding tone changes P/A R up or down by more than the thresh Amplitude jitter (%) X tone: A momentary push button is old for at least 4 ms ± .5 ms. A Phase jitter (degrees) provided for the generation of an blanking interval, that is user-set 3-level Impulse Noise auxiliary tone (2713Hz), used to from 1 to 255 ms, blocks further Transient measurements (with tone): activate remote 829-type loopback counting of gain hits. Dropouts devices. Gain hits Phase hit threshold can be 5 to 45 Phase hits SF Skip: A Signaling Frequency (SF) Skip degrees in 1 degree steps with an 3-level impulse noise mode prevents the generation of accuracy of ±.5 degrees ±10% of the tones between 2450 Hz and 2750 Hz setting. A phase hit will be counted if Dial: Built-in 16 button keypad for dial in variable or sweep modes. the phase of the holding tone pulse, DTMF (Touch Tone), changes by more than the threshold or MF dialing. Distortion: Total distortion is < - 50 dB for the fixed for at least 4 ms ± .5 ms. A blanking 1004Hz Holding Tone Generator and interval, that is user-set from 1 to Talk/Listen: Built-in microphone and speaker < - 40 dB for all other generator modes 255 ms, blocks further counting of with push-talk operation on both 2- and frequencies gain hits. wire and 4-wire lines. Earphone jack for provided earphone. RECEIVER (MEASURE) Three-level impulse noise low, Characteristics Specifications threshold can be set from 30 to Line Hold: A single line holding circuit is 110 dBrn with threshold differences of 2, provided for 2-wire operation, or the Level/Freq: Level is measured with an average 3, 4 or 6 dB. Threshold accuracy send pair of 4-wire circuits. It Responding detector. Range is +10.9 ±1dB. A blanking interval, user-set electronically simulates a holding to - 65.0 dBm with 0.1 dBm from 1 to 255 ms. blocks counting of coil with a D.C. resistance of resolution. impulses independently for each approximately 200Ohms. The A.C. Accuracy is as follows: threshold. impedance is high enough to give no more than 0.2 dB loss at 600 ohm Note: Accuracy is + 0.1 dBm at The study duration timer may be set impedance. 1004 Hz from 0.0 dBm from .1 minute to 1999.9 minutes in to - 20.0 dBm. .1 minute steps, or set to 0 for a Impedances: Terminate: 600 or 900Ohm. Frequency is measured from 200 Hz continuous study Bridge: >25 k Ohm. to 19,999 Hz with an accuracy Balance: > 60 dB below 4 kHz., of ± .01% ± 1 Hz, and a resolution of Each transient has a count capacity decreasing 6 dB/octave above 5 kHz. 1 Hz. Input level + 10 to - 40 dBm. of 09999. Filters same as Noise. Return loss:>30 dB 200-5000 Hz, > 15 Damping: A damp mode reduces the display dB 5-20 kHz. D.C. blocking: P/AR: Peak-to-Average Ratio is measured update rate from approximately 150 volts. from 0 to 120 units to a resolution of 4 times/second to 1 P/AR unit. Accuracy is ± 2 from approximately 2 times/second for 30 to 110, ± 4 outside of this range. reading widely fluctuating Store/Recall: 10 complete Unit setups may be measurements. stored by user in internal nonvolatile P/AR signal level is measured from memory and recalled for ease of 0 to -40 dBm with a resolution The same switch, when in (DAMP) repeating frequently used tests. In of 1 dBm. using an RMS detector. position, also changes the monitoring addition, the results of the point of the receive (RCV) monitor last impulse or transient study (along Noise: Noise is measured with an RMS speaker to the output of the auto- with the associated setups) are stored responding detector from 10 to range amplifier (significantly to nonvolatile memory at the 99 dBrn to 1 dBrn resolution. increasing the speaker level). completion of the study. They are Accuracy is ±1 dBrn from 20 recalled automatically whenever the to 99 dBrn, and + 2 dBrn from 10 to Term/Bridge: When in terminate, the receiver termi- unit is turned on. 20 dBrn. nates the line in the selected impedance. Weighting Filters are 3 KHz flat, When in badge, the line is bridged by a Also stored in nonvolatile memory 15 KHz flat, CMsg, and high impedance (>25 k ohm), causing no are 10 User-programmable Program filter. more than .2 dB loss on a 600 ohm line. momentary frequencies. POWER PHYSICAL Notched Noise: Notched noise is the same as noise GENERATOR (SEND) with the addition of a 1010 Hz notch Characteristics Specifications filter, minimum 50 dB deep from Characteristics Specifications 995 to 1025 Hz. Power: Four 1.5V "AA" alkaline batteries (furnished) provide about 6-8 hours Variable: Frequency: 200 Hz to 19,999 Hz in S/N ratio: Signal-to-Noise (S/N) ratio displays operation. 1 Hz steps. Frequency may be the ratio of signal (holding tone) to entered directly via the keypad or notched noise. The signal must be stepped up or down in 10 Hz steps or +10 to - 40 dBm. The notched noise auto repeat steps of 100 Hz may be 10 to 70 dBrn. The S/N ratio External AC adapter powers unit with (4 steps/ second) for fast frequency may be from 10 to 50 dB. Resolution 9V DC slewing. Frequencies are is l dB, Accuracy is + I dB for crystal-controlled and accurate notched noise 20 to 70 dBrn, and to +.5 Hz. = 2 dB for notched noise from 10 to Auto shutoff after last switch actuation is 20 dBrn. user-programmable for 0 (no shutoff) or Level: + 10.0 dBm to, -50.0 dBm in . I dB from 1 to 255 minutes. May be overridden steps. Level may be entered directly Amplitude Jitter: Displays the incidental amplitude by placing power switch in the "on" via the keypad or stepped up or modulation of a holding tone. The position. Does not turn itself off while down in .1 dB steps or auto-repeat holding tone must be + 10 study is in progress. steps of 1.0 dB (4 steps/second) for to - 40 dBm, 990 to 1030 Hz. Physical: Size: 4.2" (106mm)W x 7.6" fast level slewing. Amplitude jitter is displayed from (193mm)H x 1.7x (43mm)D. Level accuracy is as follows: 0.0 to 25.0% with a resolution of Weight: 23 oz. with alkaline batteries .1% and an accuracy of ± .2% ± 5% Connections to phone line via dual bantam of reading. jacks* and RJ11C modular jack. * (Mates with Switchcraft TT253 or Weighting filters of 20-300 Hz and ADC PJ777 phone plugs .173" Dia) 4-300 Hz are provided. XT AM-48 TECHNICAL SPECIFICATIONS Phase Jitter: Displays the incidental phase XT AM-48e is an export model which meets world CCIXT modulation of a holding tone. The holding XT standards. All specifications are identical to the AM48 tone must be + 10 to - 40 dBm, 990 except as follows: to W30 Hz. Phase jitter is displayed 1. Provided noise filters are psophometric (in place of in degrees from 0.0 to 25.0 degrees C-Message) and sound weighted (in place of program). 1004 Hz: A fixed 1004 Hz holding tone is with a resolution of .1 degree 2. All noise measurements are in units of dBm instead of provided. The frequency is accurate and an accuracy of ± .2 degree ± 5% dBrn (0dBm = 90dBrn) to +.025%. of reading. Level is same as variable. 3. SF skip range is 2130 Hz to 2430 Hz. Weighting filters of 20 300 Hz and 4. Slope tones are: 304, l004. 2004, and 3004 Hz. 3-Tone: A three tone slope frequency mode 4-300 Hz are provided. (Slope) is provided which cycles continuously between 404 Hz, 1004 Hz, and 2804 Hz, giving 5 Impulse Noise: The three level impulse noise low seconds of each tone. Frequency threshold can be set from 30 accuracy is same as variable. Level to 110 dBrn with threshold is same as variable. differences of 2, 3, 4 or 6 dB. Threshold accuracy ±1dB. A user- Sweep: A programmable frequency sweep selected blanking interval of 1 generator is provided It generates to 255 ms blocks further counting tones continuously from a of impulse independently for each user-specified START frequency (200 Hz threshold. The study for timer may to 19,999 Hz) at, a user specified STOP be set from .1 minute to 1999.9 frequency (200 Hz to 19,999 Hz) at a minutes in .l minute steps, or set to 0 for user-specified frequency a continuous study. Each threshold STEP interval (1 Hz to 19,999 Hz) has a count capacity of 0 9999. and at a user specified step RATE (0.1 second to, 1,999.9 seconds Weighting filters same as Noise. frequency). Frequency accuracy is same Transients: Counts dropouts, gain hits, phase as variable. Level is same hits, and 3 level impulse noise with as variable. tone. Holding tone must be +10 PAR: A PAR waveform generator is to 40 dBm, 995 to 1025 Hz. provided which generates the 16 simultaneous frequency PAR waveform per Bell 41009 specifications. The level may be set from 0.0 dBm to 40.0 dBm with 0.1 dBm resolution. 6-23-06