External Timing Cables
A-4 SmartEdge 1200 Router Hardware Guide
To bring a signal from external equipment into the SmartEdge router:
• For the DS-1 interface (BITS):
You must connect the DS-1 output of the external equipment to pins 2 and 6 of the DB-9 connector on
the rear panel of the SmartEdge chassis. The polarity of the signal does not matter. The SmartEdge
system accepts a standard BITS source transmitting a framed-all-ones pattern at the DS-1 rate of
1.544 Mbps.
• For the E1 interface (SSU):
You must connect the E1 output of the external equipment to pins 2 and 6 of the SSU DB-9 connector
on the rear panel of a SmartEdge chassis. The polarity of the signal does not matter. A SmartEdge
system accepts a standard synchronization source transmitting an HDB3-encoded, framed-all-ones
pattern at the E1 rate of 2.048 Mbps.
Table A-6 lists the pin assignments for either cable.
Note An adapter, available as an option, provides wirewrap pins to allow you to attach a cable
without a connector.
Table A-6 External Timing Cable Pin Assignments
# Signal Name
1
1. The direction, input or output, is with respect to the controller card: input describes data flowing
into the controller card; output describes data being transmitted by the controller card.
Color Notes
1. Shield Bare Wire Frame ground connection
2. External equipment input (+) White Twisted pair with pin 6
3. – – No connection
4. External equipment output (+) White Twisted pair with pin 9
5. Shield Bare Wire Frame ground connection
6. External equipment input (–) Blue Twisted pair with pin 2
7. – – No connection
8. – – No connection
9. External equipment output (–) Orange Twisted pair with pin 4
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