Operating instructions

Installation RCS20 M:N Redundancy Switch
2-16 TM056 - Rev. 2.3
9 CS-A Clear to Send A (-) Output
10 MF Mod Fault - Open
Collector
Output
28 DF Demod Fault - Open
Collector
Output
27 CS-B Clear to Send B (+) Output
11 DM-A Data Mode A (-) Output
29 DM-B Data Mode B (+) Output
13 RR-A Receiver Ready A (-) Output
31 RR-B Receiver Ready B (+) Output
15 BAL EXC-A External Clock A (-) Input
33 BAL EXC-B External Clock B (+) Input
16 RX-0-A Receive Octet A (-) Output
34 RX-0 B Receive Octet B (+) Output
17 TT-A Terminal Timing A (-) Input
35 TT-B Terminal Timing B (+) Input
1, 19, 20, 37 GND Signal Ground
2.6.11 Digital Data Switch (DDS20) J1 through J10 - Switch Connector
J1 through J10 are the 68-Pin high-density data connectors that carry data to and from the modem.
The pinouts for these connectors are shown below in Table 2-12.
Table 2-12. J18 - Switch Connector - 68-Pin High-Density Female
Pin No. Signal Description Direction
1 G.703B SD-A G.703 Send Data Input A (-) Input
2 SYNC SD-A Synchronous Data Send Data Input -A (-) Input
3 ESCBWO 1C IDR ESC Backward Alarm Out - 1 Common None
4 G.703B IDI-A G.703 Insert Data Input - A (-) Input
5 SYNC ST-A Synchronous Data Send Timing Output - A Output
6 ESCBWO 1NO IDR ESC Backward Alarm Out - 1 Normally
Open
Input
7 SYNC TT-A Synchronous Data Terminal Timing Input A Input
8 ESCBWO 2NC IDR ESC Backward Alarm Out - 2 Normally
Closed
9 DDO-A RT-A G.703 Drop Data Out A - Synchronous Data
Receive Timing Output - A
Output