RCS20 M:N Redundancy Switch
Revision 15
Electrical Interfaces
MN-RCS20 and CD-RCS20
5–20
5.3.2
DDS20 – Universal Switch Back Panel Connectors
Figure 5-12 DDS20 Universal Switch – Back Panel Connectors
5.3.2.1
J1 | MODEM 1 through J8 | MODEM 8 68-Pin High Density Min DSUB
Female Connectors
Each connector, J1 | MODEM 1 through J8 | MODEM 8, connects to each prime modem. If a prime
channel is unused, then its corresponding connects should be left unconnected.
Pin No.
Signal Name
Signal
Direction
1
G.703 Send Data Input A (-)
G.703B SD-A
Input
2
Synchronous Data Send Data Input -A (-)
SYNC SD-A
Input
3
IDR ESC Backward Alarm Out - 1 Common
ESCBWO 1C
---
4
G.703 Insert Data Input - A (-)
G.703B IDI-A
Input
5
G.703 Drop Data Out A - Synchronous Data Send Timing Output - A
G.703B DDO-A SYNC ST-A
Output
6
IDR ESC Backward Alarm Out - 1 Normally Open
ESCBWO 1NO
---
7
Synchronous Data Terminal Timing Input A
SYNC TT-A
Input
8
IDR ESC Backward Alarm Out - 2 Normally Closed
ESCBWO 2NC
---
9
Synchronous Data Receive Timing Output - A
SYNC RT-A
Output
10
IDR ESC Backward Alarm Output - 3 Common
ESCBWO 3C
---
11
G.703 Insert Data Out A - Synchronous Data Receive Data A
IDO-A RD-A
Output
12
IDR ESC Backward Alarm Output - 3 Normally Open
ESCBWO 3NO
---
13
External Clock Input - A
BAL EXC-A
Input
14
Ground
GND
---
15
IDR ESC Audio Input Channel 1A
ESCAUDTX 1A
Input
16
IDR ESC Audio Input Channel 2A
ESCAUDTX 2A
Input
17
IDR ESC Audio Output Channel 1A
ESCAUD RX 1A
Output
18
IDR ESC Audio Output Channel 2A
ESCAUD RX 2A
Output
