7705 SAR Interfaces
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Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
3.11.1.6 Configuring Adapter Card Clock Mode
Clocking mode is defined at the adapter card level. There are three clocking modes
available: differential, adaptive, and dcr-acr, which is a mixture of both differential
and adaptive. The dcr-acr option enables differential and adaptive clocking on
different ports of the same card or chassis. Differential and dcr-acr clocking modes
also support a configurable timestamp frequency. In order to carry differential clock
recover information, the RTP header must be enabled on the SAP.
The following chassis, cards, and modules support all clocking modes:
• 16-port T1/E1 ASAP Adapter card, version 2
• 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
When the timestamp frequency is configured for differential or dcr-acr mode on a
4-port T1/E1 and RS-232 Combination module, the configured value will take effect
on both modules installed in the 7705 SAR-H.
The following chassis and cards support adaptive clocking mode only:
• 16-port T1/E1 ASAP Adapter card, version 1
The following cards support differential clocking mode only:
• 4-port OC3/STM1 / 1-port OC12/STM4 Adapter card (DS1/E1 channels)
• 4-port DS3/E3 Adapter card (clear channel DS3/E3 ports and DS1/E1 channels
on channelized DS3 ports (E3 ports cannot be channelized)); differential
clocking mode on DS1/E1 channels is supported only on the first three ports of
the card
Use the following CLI syntax to configure adaptive clocking mode.
CLI Syntax: config>card>mda#
clock-mode adaptive
no shutdown
Use the following CLI syntax to configure differential clocking mode or a combination
of differential and adaptive clocking modes with a timestamp frequency.
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