Verilink C100 (880-502893-001) Product Manual - Manual (Page 109)

Interfaces and Cables
6/15/99 Verilink C100 and C150 T1/FT1 CSU/DSU C-3
RS232/RS530/RS4
22 channel
interfaces The DB25 pin female on the rear of the unit may be used for either
RS232 or for RS422/RS530 interfaces based on the interface selection
on the DIP switches or console. This interface will appear as a DCE
(modem) to the Customer Equipment. When RS232 is selected, the
interface on the rear of the unit will appear as follows:
Table C-3 DB25 Pin Female Connector Wiring on Rear of Unit When RS232 Is Selected
RS530/422 interface
When RS530/422 interface is selected, the signals on the DB25 pin
connector will also appear as a DCE (modem) to the Custome
Equipment. The interface actually is wired for RS530. A 25 pin to 37
pin RS422 adapter cable (not supplied) must be used for RS422.
wiring diagram for the RS422 cable is included at the end of this
section. When RS530 is selected, the interface on the rear of the unit
will appear as follows:
Pin Number Signal Name Direction
1 Shield both ways
2 Transmitted Data to T-1 CSU/DSU
3 Received Data from T-1 CSU/DSU
4 Request to Send to T-1 CSU/DSU
5 Clear to Send from T-1 CSU/DSU
6 DCE Ready from T-1 CSU/DSU
7 Signal Ground both ways
8 Carrier from T-1 CSU/DSU
15 Transmit Signal Element Timing from T-1 CSU/DSU
17 Receiver Signal Element Timing from T-1 CSU/DSU
20 Data Terminal Ready to T-1 CSU/DSU
24 DTE Transmit Signal Element
Timing to T-1 CSU/DSU