M7/M7L/M7LT Modular Satellite Modem MaintenanceM7/M7L/M7LT - Rev. 0.05 2-92.3.8. Data Interface OptionsThe modem is supplied with an electronically programmable data interface assembly2.3.8.1. Synchronous Serial Data Interface2.3.8.1.1. Synchronous Serial Data Interface Connection (J11):The connection to the primary data signals on the Synchronous Serial Data Interface is on a 25-pinfemale “D” sub connector. The physical connector and pinout is per the RS-530 interface standard.The electrical interface however can be changed under front panel or remote program control toinclude the types of interfaces shown above.NOTE: Connecting the Data Interface to other types of equipment involves building cables betweenthe M7 and that other equipment’s physical interface. Additional information aiding thecreation of adaptor cables from the modem’s 25-pin female “D” sub connector to other typesof interface connections such as V.35 “Winchester” type connector standard pin-outs ispresented in Appendix C - Cabling Specifications”Table 2-6 shows the pin assignments for the selectable standard electrical interfaces.Table 2-6 – Synchronous Serial Data Interface Connector Pinout (J11)J11Pin #EIA-449 SignalName V.35 Signal Name EIA-232 SignalName *(3)EIA-530 SignalName Direction1 Shield (GND) Shield (GND) Shield (GND) SHD (GND) GND2 Transmit Data (A) – SD A (SD-) SD TD A Input14 Transmit Data (B) + SD B (SD+) TD B Input15 Transmit Clock (A) – SCT A (ST-) ST TTSETC A Output12 Transmit Clock (B) + SCT B (ST+) TSETC B Output3 Receive Data (A) – RD A (RD-) RD RD A Output16 Receive Data (B) + RD B (RD+) RD B Output17 Receive Clock (A) – SCR A (RT-) RT RSETC A Output9 Receive Clock (B) + SCR B (RT+) RSETC B Output4 RTS (A) – RTS RTS RTS A Input19 RTS (B) + RTS B Input5 CTS (A) – CTS CTS CTS A Output13 CTS (B) + CTS B Output6 Data Mode (A) – DSR DCR DCR A Output22 Data Mode (B) + DCR B Output20 TR (A) – DTR DTR DTR A Input23 TR (B) + DTR B Input8 Receive Ready (A) – RLSD RLSD RLSD A Output10 Receive Ready (B) + RLSD B Output24 Terminal Timing (A)– SCTE A (TT-) TSETT TSETT A Input11 Terminal Timing (B)+ SCTE B (TT+) TSETT B Input18 Mod Fault Alarm OC TTL output 25 Output21 Demod Fault Alarm OC TTL output 23 Output7 Signal GND SIG GND GND SGND GND25 Aux RS-232Transmit/ReceiveAux RS-232Transmit/ReceiveAux RS-232Transmit/ReceiveAux RS-232Transmit/ReceiveInput /Output
