The figure below shows the wiring schematic of the cable used to connect the T1/E1 interface module to the
rear of the patch panel.
Figure 61: Wiring Schematic of Cable Between T1/E1 Interface and Patch Panel
Serial Interface Modules Pinouts
The following sections summarize the pinouts on the 14-port serial interface module when used with the cable
types specified in Connecting Serial Cables .
DB-9 Connector Pinouts
The table below summarizes the pinouts for each serial interface type when using a DB-9 connector.
Table 25: DB-9 Pinouts
IRIG-B
RS-485
Description
Direction
Standard DB-9
Pin
NC
NC
Unused
Output
NC
1
NC
NC
Receive
Input
RxD
2
IRIG-B-
(RS232)
-
Transmit
Output
TxD
3
IRIG-B-
(RS485)
TxD-
DTR
Output
DTR
4
GND
GND
GND
-
GND
5
Cisco ASR 902 and ASR 902U Aggregation Services Router Hardware Installation Guide
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Troubleshooting
Serial Interface Modules Pinouts