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Cabling the SRP IOA

Before powering up the router, you must set up a management console. The console enables you to communicate with your system during the power-up process and to manage your system using the command-line interface (CLI).

When connecting a console directly to the SRP IOA, use a cable appropriate for your terminal connector. The cable must have a female DB-9 connector to attach to the RS-232 port on the SRP IOA. See Figure 19.

The console port is considered a data terminal equipment interface (DTE). Direct connection to a terminal or PC (which also have DTE interfaces) requires a crossover cable.

The router has network timing ports and management ports located on the SRP IOA. See Figure 19 and Table 7 for details on each component.

Table 7: SRP IOA Ports

Port

Description

Network timing ports

  • Two dual-purpose BNC connectors for BITS timing clock sources (E1 or T1)
  • User-configurable through the CLI
  • Primary (A) and secondary (B)
  • 75-ohm E1 2.048-Mbps/T1 1.544–Mbps inputs terminating with a 120/75 ohm or 100/75 ohm balun

Management ports

  • One 10/100Base-T Ethernet management port with an RJ-45 connector
  • Two RS-232 ports with a DB-9 connector for direct CLI (Console) and debug (Auxiliary) access.

    The Auxiliary port is used to debug ports on a specific processor (SRP module, LM).

Network Timing Ports

The SRP IOA has two input ports for external network clock sources (75-ohm E1 2.048-Mbps/T1 1.544–Mbps inputs with BNC connectors). These ports provide a way to ensure that the router system clock remains synchronized with the network's system clock. The primary clock is labeled A; the secondary, redundant clock, is labeled B. See Figure 19.

Use shielded cables to connect the external clock sources to the clock source input ports.

Figure 19: SRP IOA

Image g015329.gif

To connect the clock source input ports:

  1. Attach the BNC connector to Clock A's network timing port.
  2. Attach the opposite end of the network timing cable to your network's clock source A.
  3. Repeat steps 1 and 2 for the Clock B connections.

Management Ports

The Management section of the SRP IOA has three ports (Figure 19) for management access:

The management port is considered a data terminal equipment interface (DTE). Direct connection to a terminal or PC (which also have DTE interfaces) requires a crossover cable.

See Accessing E-series Routers for more information about management access.

Connecting to the Network

To connect the router to the network:

  1. Insert an Ethernet cable (RJ-45) connector into the 10/100Base-T (RJ-45) port on the SRP IOA until it clicks into place.
  2. Connect the other end of the cable to the appropriate Ethernet network for an out-of-band connection.

Connecting to a Console Terminal

When you connect a console directly to the SRP IOA, use a cable appropriate for your terminal connector. The cable must have a female DB-9 connector to attach to the RS-232 port on the SRP IOA.

To connect the console to the SRP IOA:

  1. Insert the female DB-9 connector into the RS-232 port, and tighten the screws.
  2. Connect the other end of the cable to your terminal's serial port (VT100/ANSI).

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