Console And Auxiliary Port Connection Equipment - Cisco 7000 Series Hardware Installation And Maintenance Manual

Preparing Network Connections
Figure 2-39
Caution
the HSSI cable specification is more stringent than that for a SCSI-II. We cannot guarantee proper
operation if a SCSI-II cable is used instead of an HSSI interface cable.
A null modem cable (CAB-HNUL) allows you to connect two routers directly back to back between
an available HSSI port on each. This setup allows you to verify the operation of the HSSI port or to
directly link the routers in order to build a larger node. The null modem cable uses the same 50-pin
connectors as the HSSI interface cable, but the signals are wired differently. For instructions for
connecting a null modem cable, refer to the section "HSSI Connections" in the chapter "Installing
the Router." The appendix "Cabling Specifications" lists the cable pinouts.

Console and Auxiliary Port Connection Equipment

The RP (and RSP7000) contain two EIA/TIA-232 ports: a DCE-mode console port (DB-25
receptacle) and a DTE-mode auxiliary port (DB-25 plug). These are asynchronous ports (unlike the
synchronous FSIP serial ports), so be sure that any devices you connect to these ports are
asynchronous. Synchronous transmission uses precise timing to synchronize transmissions between
the transmitter and receiver, and maintains separate clock and data signals. Asynchronous
transmission uses control bits to indicate the beginning and end of characters instead of a precise
clock signal.
You need a console terminal to configure the interfaces and bring the system online. You also need
an EIA/TIA-232 DCE console cable to connect the terminal to the console port on the RP (or
RSP7000). After you establish normal operation, you can disconnect the terminal. Both ends of the
console cable should be EIA/TIA-232 plugs to enable you to connect to the RP (or RSP7000) DCE
console port DB-25 receptacle and to the DB-25 receptacles used on the DTE ports on most
terminals.
Before you connect a terminal to the console port, configure the terminal to match the router console
port as follows: 9600 baud, 8 data bits, no parity, 2 stop bits (9600 8N2).
The auxiliary port is a DTE DB-25 plug that you can use to connect an asynchronous modem,
another router, a CSU/DSU, or other DCE equipment. You also must supply your own interface
cable between the auxiliary port and the equipment you are connecting. For console and auxiliary
port pinouts, refer to the appendix "Cabling Specifications."
2-44 Cisco 7010 Hardware Installation and Maintenance
HSSI Interface Cable Connector
Although the HIP connector and the HSSI interface cable are similar to SCSI-II format,