To Next Page

To Previous Page

External Timing Cables

Cables and Pin Assignments A-3

Ethernet Straight Cable

This shielded cable connects the Ethernet port on a controller card to a LAN hub. Both ends of the cable

are terminated in standard RJ-45 eight-pin modular plugs. Table A-4 lists the pin assignments, which are

for both ends of the cable.

External Timing Cables

An external timing cable provides a connection from an external synchronization source, such as a building

integrated timing supply (BITS) or synchronization supply unit (SSU), to a SmartEdge router. Using two

cables you can connect a SmartEdge chassis to primary and secondary inputs on the external equipment.

Table A-5 lists the cable specifications for the external timing cable.

A cable consists of two individually shielded, twisted-wire pairs: one pair for the synchronization input and

another pair for the synchronization output.

The nominal impedance of the DS-1 wire pairs is 100 ohms; that of the E1 wire pairs is 120 ohms.

One end of the cable is terminated with a DB-9 male connector; the other end of the cable is left

unterminated for attachment to the wirewrap posts of the external equipment. Both of the DB-9 connectors

(PRIMARY and SECONDARY) on the rear panel of a SmartEdge chassis have identical pin assignments.

Table A-4 Ethernet Straight Cable Pin Assignments

# Signal Name Notes

1. Tx (+) –

2. Tx (–) –

3. Rx (+) –

4. – No connection

5. – No connection

6. Rx (–) –

7. – No connection

8. – No connection

Table A-5 Cable Specification for External Timing Cable

Maximum Length

Interface Description Chassis Connectors

1. The chassis connectors are on the rear of the chassis.

Cable Connector Feet Meters

External Timing Shielded twisted-pair DB-9 female DB-9 male None –

Note The XCRP and XCRP3 Controller cards can both receive and transmit timing data; however,

the XCRP4 Controller card can receive timing data only. However, the SmartEdge OS does

not support the transmission of timing data to another SmartEdge router or any other external

equipment.

Ericsson Redback Networks SmartEdge 1200 User Manual

Questions and Answers: