ORDERING SRM-5AC SRM-5AC/*/+ Asynchronous Short Range Asynchronous Short Range Modem Modem * Specify DTE connector: F for female 25-pin connector M for male 25-pin connector + Specify line connector: RJ-12 for RJ-12 jack and terminal block RJ-45 for RJ-45 jack and terminal block (Default is RJ-45 and terminal block) 119-100-08/00 Specifications are subject to change without prior notice.  2000 RAD Data Communications Ltd. • SRM-5AC features a switch-selectable FEATURES DESCRIPTION DTE/DCE interface, and a switch-selectable Printer Support Mode. It also includes • SRM-5AC, asynchronous short range • Asynchronous, full or half duplex a jumper for configuring the modem's carrier modem, is used for local data distribution, to be constantly ON or controlled by RTS • Data rates up to 19.2 kbps connecting full or half duplex asynchronous (see Figure 1). DTEs to DTEs operating over unconditioned • Point-to-point or multipoint 4-wire lines (two twisted pairs). SRM-5AC When set to DCE, the modem carrier can ensures integrity of data transmission for • Transmission range up to 6.8 km be set to constantly ON, or controlled by distances up to 6.8 km (4.1 miles), (4.1 miles) the RTS signal (Circuit 105). Operation depending on wire gauge (see Table 1). with controlled carrier enables connection • Internal filter for high noise immunity Table 1. Approximate Range of SRM-5AC in a multipoint configuration. and for surge protection Controlled carrier can also be used in Data 19 AWG 24 AWG 26 AWG • DCE/DTE mode applications requiring passing of a control Rate (0.9 mm) (0.5 mm) (0.4 mm) signal end-to-end (RTS on one SRM-5AC kbps km miles km miles km miles • Transformer isolated is passed to DCD on the other unit). 1.2–19.2 6.8 4.1 3.0 1.9 2.3 1.4 SRM-5AC also includes a LED to indicate • No AC power required carrier detection. • LED indicator for carrier detection • SRM-5AC is equipped with an internal filter When set to DTE, SRM-5AC operates as a for high noise immunity. The internal filter DTE for connection to DCE (such as a overcomes both radiated and conducted multiplexer port), without the use of a APPLICATIONS interference, and is recommended for noisy environments, such as industrial locations. cross cable. When set to Printer Support Mode, SRM-5AC supports printer flow control by transmitting DTR on the printer side (busy signal) to CTS on the other side. As a result, CTS at the computer side will drop when the printer becomes busy. • SRM-5AC is coupled to the line through • Line Interface SPECIFICATIONS isolation transformers, which, in conjunction 5-screw (4-wire and ground) terminal block, with additional circuitry, protect against AC • Data Rates and RJ-12 or RJ-45 jack (see Ordering) or DC overvoltages. As the transformers are Up to 19.2 kbps • Power rated at over 1,500V RMS, the modem is • Transmission Format For proper operation, at least two of the suitable for connection to local circuits Asynchronous provided by most national telephone following DTE interface connector pins must administrations. be active: • Transmission Line • Innovative circuitry allows SRM-5AC to 4-wire unconditioned line (two twisted pairs) DCE mode: 2, 4, 20, 24 operate without connection to the mains • Transmission Mode DTE mode: 3, 6, 8 supply by using ultra-low power from the Full or half duplex 4-wire operation The typical power drawn from DTE is 40 mW data and control signals. The modem will (at least +6V signal level). operate even if only TD (Circuit 103), • Transmission Controls RD (Circuit 104) and RTS (Circuit 105) are DSR (Circuit 107), turns on immediately • Physical connected. after DTE raises DTR (Circuit 108) Length: 69 mm / 2.7 in • The low transmit level minimizes cross talk DCD turns on after recognizing the receive Height: 18 mm / 0.7 in onto adjacent circuits within the same cable. signal from the line Width: 53 mm / 2.1 in Data is transmitted and received using a CTS (Circuit 106) turns on 40 msec Weight: 26g / 0.9 oz balanced interface, ensuring high immunity (typical) after DTE raises RTS (Circuit 105). • Environment to circuit noise. • Carrier Control Temperature: 0–50°C / 32–122°F • Two connectors are available for the line The carrier is user-selectable for either Humidity: Up to 90%, non-condensing connection: a five-screw terminal block, and continuous operation or switched operation, a modular socket for either RJ-12 or RJ-45 controlled by the RTS (Circuit 105) indicator. (see Ordering). • Transmission Level • SRM-5AC is fully compatible with SRM-6AC and SRM-6ACU. Additionally, it is 0 dBm compatible with CMN-C6AC and • Transmission Range CMN-C6ACU cards for mounting in the Up to 6.8 km / 4.1 miles (see Table 1) CMN-16 compact modem rack. • DTE Interface RS-232/V.24, integral 25-pin connector, male or female (see Ordering) Table 2. Switch/Jumper Setings Declaration of Conformity INSTALLATION Switch/ Function Possible Settings Factory Caution. Be careful when setting jumpers or Mfr. Name: RAD Data Communications Ltd. Jumper Setting performing any actions within the product so that you Mfr. Address: 12 Hanechoshet St. do not bend or break any components. DCE/DTE Selects the DTE – SRM-5AC DCE Tel Aviv 69710 Switch DTE or DCE operates as DTE Israel Install the SRM-5AC modem as follows: operation DCE – SRM-5AC mode declares that the product: 1. Snap the SRM-5AC nameplate out of the operates as DCE plastic cover of the unit. Normal/ Controls the Normal – Normal Normal Product Name: SRM-5AC Printer Printer operation 2. Configure the modem carrier to be Switch Support Mode constantly ON or controlled by RTS (see Conforms to the following standard(s) or other Printer – Printer Figure 1 and Table 2). Support mode normative document(s): EMC: EN 55022 (1987): Limits and 3. Select the SRM-5AC operation mode – DTE CARR Controls the ON – Constantly ON ON methods of measurement of radio or DCE (see Figure 1, Figure 2 and Table 2). Jumper carrier CTRL – Controlled by disturbance characteristics of operation RTS 4. Configure the modem to operate normaly or information technology equipment. in the Printer Support Mode (see Figure 1 EN 50082-1 (1992): Electromagnetic and Table 2). compatibility – Generic immunity Note: The Normal/Printer switch in both modems standards for residential, commercial should be set to the same position. When set to Printer and light industry. operation, the DCE/DTE switch must be set to DCE operation. Supplementary Information: The product herewith complies with the requirements of the EMC Directive 89/336/EEC. The product was tested in a typical configuration. Tel Aviv, November 26th 1995 Figure 2. DCE/DTE Switch Configuration 5. Close the unit by inserting the two tabs of Haim Karshen the SRM-5AC nameplate and pressing the Quality Manager plate down. Figure 1. Switch/Jumper Locations European Contact: RAD Data Communications GmbH, Berner Strasse 77, 60437 Frankfurt am Main, Germany 6. Connect the 4-wire line: • Terminal block connector: Connect +XMT of the local SRM-5AC +RCV of the remote modem Connect -XMT of the local SRM-5AC to -RCV of the remote mode. Reverse the procedure for the second pair of wires. • RJ-12 or RJ-45 connector: Plug the cable into the RJ-12 or RJ-45 jack. Make sure that the correct polarity is maintained throughout the cabling system (see Figure 3 and Figure 4 for the pinouts). Figure 3. RJ-12 Connector Pinout Figure 4. RJ-45 Connector Pinout Note: When operating in a noisy environment, use shielded cables and connect one end of the cable shield to "Ground". 7. Plug the modem directly into the 25-pin connector of the DTE or computer port. Fasten the screws on each side of the connector.