Comtech EF Data CRS-150 - Manual (Page 36)

CRS-150 1:1 Redundancy Switch Revision 2
Connector Pinouts MN/CRS150.IOM
3–10
3.3.2 Rear Panel Terrestrial Data Connectors
3.3.2.1 Balanced G.703 A and B Connectors, DB-15M
The 15-pin ‘D’ Type female (DB-15F) Balanced G.703 A and B connectors
are used for balanced operation at the G.703 data rates of T1 (1.544 Mbps),
E1 (2.048 Mbps), or T2 (6.312 Mbps).
Balanced G.703 A and B Connectors (DB-15F)
Pin # Signal Function Name Direction
1* Drop Data Input ( - ) DDI– Out
9* Drop Data Input (+) DDI+ Out
2 Ground GND
10 Not Used
3* Insert Data Output ( - ) IDO– In
11* Insert Data Output (+) IDO+ In
4 Ground GND
12 Drop Data Output ( - ) DDO– In
5 Drop Data Output (+) DDO+ In
13 Insert Data Input ( - ) IDI– Out
6 Insert Data Input (+) IDI+ Out
14 Not Used
7 Not Used
15 Not Used
8 Not Used
*Use for all non-Drop and Insert and T2/E2 balanced applications.
In order to simplify the cabling between the CDM-600 modems and the CRS-150
Redundancy Switch, all G.703 signals are carried between modems and switch
on the BALANCED connections, regardless of the choice of balanced/
unbalanced connectors on the CRS-150 front panel.
The user should not be concerned about this – the modem signals the
appropriate port type (balanced or unbalanced) to the CRS-150, so correct
operation of the ports is assured.