Site Preparation
1.15 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 the SmartEdge 600 router. Using two cables you can
connect the SmartEdge 600 router to primary and secondary inputs on the
external equipment.
Table 15 Cable Specification for External Timing Cable
Interface Description Chassis Connectors
(1)
Cable Connector
External Timing Shielded twisted-pair DB-9 female DB-9 male
(1) The chassis connectors are on the rear of the chassis.
A cable consists of two individually shielded, twisted-wire pairs: one pair for the
synchronization input and another pair for the synchronization output.
Note: The XCRP4 Controller card can receive timing data only.
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 wire wrap posts
of the external equipment. Both of the DB-9 connectors (PRIMARY and
SECONDARY) on the rear panel of the SmartEdge 600 router have identical
pin assignments.
Note: An adapter, available as an option, provides wire wrap pins to allow you
to attach a cable without a connector.
To bring a signal from external equipment into the SmartEdge 600 router:
• For the DS-1 interface (BITS)—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
router. The polarity of the signal does not matter. The router 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)—Connect the E1 output of the external
equipment to pins 2 and 6 of the SSU DB-9 connector on the rear panel
of the router. The polarity of the signal does not matter. The router
accepts a standard synchronization source transmitting an HDB3-encoded,
framed-all-ones pattern at the E1 rate of 2.048 Mbps.
Table 16 External Timing Cable Pin Assignments
Signal Name
(1)
Color Notes
Shield Bare Wire Frame ground connection
External equipment input (+) White Twisted pair with pin 6
––
No connection
1527/153 30-CRA 119 1170/1 Uen A | 2010-04-09
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