SRP IOA
The SRP IOA module provides three management ports (console, auxiliary, 10/100Base-T Ethernet). You can connect a console directly to the RS-232 serial console port or debug auxiliary port using a shielded straight-through cable with a female DB-9 connector on one end and a male DB-25 with a crossover adapter on the DB-25 end. These ports are called serial ports, RS-232 ports, or console ports. These ports are considered a data terminal equipment interface (DTE). Direct connection to a terminal or PC (which also have DTE interfaces) requires a crossover cable.
- See Figure 35 and Table 17 for the pinout of the console port.
- See Figure 35 and Table 18 for the pinout of the auxiliary port.
- See Table 19 for the pinout of the Ethernet port.
Figure 35: SRP IOA Console Port and Auxiliary Port Pinout

Table 17: SRP IOA – RS-232 Console Connector Pinout
Pin | Signal |
|---|---|
1 | DCD |
2 | RXD |
3 | TXD |
4 | DTR |
5 | GND |
6 | DSR |
7 | RTS |
8 | CTS |
9 | RNG |
Table 18: SRP IOA – RS-232 Auxiliary Connector Pinout
Pin | Signal |
|---|---|
1 | no connect |
2 | RXD |
3 | TXD |
4 | DTR |
5 | no connect |
6 | DSR |
7 | no connect |
8 | no connect |
9 | no connect |
After you have configured an IP address on the system, you can connect using a host running Telnet over the 10/100Base-T Ethernet port on the SRP IOA. The router is shipped with a straight-through cable having a male RJ-45 Ethernet connector on each end.
See Table 19 for the pinouts of the Ethernet cable's RJ-45 connector.
Table 19: SRP IOA – RJ-45 Connector Pinout
Pin | Signal |
|---|---|
1 | TX + |
2 | TX – |
3 | RX + |
4 | no connect |
5 | no connect |
6 | RX – |
7 | no connect |
8 | no connect |
To facilitate connecting the system to a terminal, the system is shipped with one of each of the following cable adapters:
- DB-9 female to RJ-45 female crossover null modem adapter
- DB-9 female to RJ-45 female straight-through adapter
Table 20 lists the pinouts for the crossover adapter.
Table 20: DB-9 – RJ-45 Crossover Adapter Pinout
DB-9 Pin | Signal | RJ-45 Pin |
|---|---|---|
1 | DCD | 1 |
2 | RXD | 3 |
3 | TXD | 2 |
4 | DTR | 6 |
5 | GND | 5 |
6 | DSR | 4 |
7 | RTS | 8 |
8 | CTS | 7 |
9 | RNG | no connect |
Table 21 lists the pinout for the straight-through adapter.
Table 21: DB-9 – RJ-45 Straight-Through Adapter Pinout
DB-9 Pin | RS-232 Signal Name | RJ-45 Pin | Ethernet Signal Name |
|---|---|---|---|
1 | DCD | 1 | TX + |
2 | RXD | 2 | TX – |
3 | TXD | 3 | RX + |
4 | DTR | 4 | no connect |
5 | GND (signal) | 5 | no connect |
6 | DSR | 6 | RX – |
7 | RTS | 7 | no connect |
8 | CTS | 8 | no connect |
9 | RNG | no connect | none |
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