7705 SAR Interfaces
80
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
3.2.5.3 Network Synchronization on DS3/E3 Ports
Each clear channel DS3/E3 port on a 4-port DS3/E3 Adapter card can be
independently configured to be loop-timed (recovered from an Rx line), node-timed
(recovered from the SSU in the active CSM), or differential-timed (derived from the
comparison of a common clock to the received RTP timestamp in TDM pseudowire
packets). When a DS3 port is channelized, each DS1 or E1 channel can be
independently configured to be loop-timed, node-timed, or differential-timed
(differential timing on DS1/E1 channels is supported only on the first three ports of
the card). When not configured for differential timing, a DS3/E3 port can be
configured to be a timing source for the node.
3.2.5.4 Network Synchronization on DS3 CES Circuits
Each DS3 CES circuit on a 2-port OC3/STM1 Channelized Adapter card card can be
loop-timed (recovered from an Rx line) or free-run (timing source is from its own
clock). A DS3 circuit can be configured to be a timing source for the node.
3.2.5.5 Network Synchronization on T1/E1 Ports and Circuits
Each T1/E1 port can be independently configured for loop-timing (recovered from an
Rx line) or node-timing (recovered from the SSU in the active CSM).
In addition, T1/E1 CES circuits on the following can be independently configured for
adaptive timing (clocking is derived from incoming TDM pseudowire packets):
• 16-port T1/E1 ASAP Adapter card
• 32-port T1/E1 ASAP Adapter card
• 7705 SAR-M (variants with T1/E1 ports)
• 7705 SAR-X
• 7705 SAR-A (variant with T1/E1 ports)
• T1/E1 ports on the 4-port T1/E1 and RS-232 Combination module
T1/E1 CES circuits on the following can be independently configured for differential
timing (recovered from RTP in TDM pseudowire packets):
• 16-port T1/E1 ASAP Adapter card, version 2
• 32-port T1/E1 ASAP Adapter card
• 4-port OC3/STM1 / 1-port OC12/STM4 Adapter card (DS1/E1 channels)
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