System Management
224
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
On the 7705 SAR-A variant with T1/E1 ports, line timing is supported on T1/E1 ports.
Line timing is also supported on all synchronous Ethernet ports on both 7705 SAR-A
variants. Synchronous Ethernet is supported on the XOR ports (1 to 4), configured
as either RJ-45 ports or SFP ports. Synchronous Ethernet is also supported on SFP
ports 5 to 8. Ports 9 to 12 do not support synchronous Ethernet and, therefore, do
not support line timing.
On the 7705 SAR-Ax, line timing is supported on all Ethernet ports.
On the 7705 SAR-W and 7705 SAR-Wx, line timing is supported on all Ethernet RJ-
45 ports and SFP ports.
On the 7705 SAR-8 and 7705 SAR-18, line timing is supported on the following
adapter cards:
• 16-port T1/E1 ASAP Adapter card (version 1 is not supported on the
7705 SAR-18)
• 32-port T1/E1 ASAP Adapter card
• 8-port Ethernet Adapter card, version 2, on the two Ethernet SFP ports with
SFPs that support synchronous Ethernet
• 6-port Ethernet 10Gbps Adapter card
• 8-port Gigabit Ethernet Adapter card (dual-rate and copper SFPs do not support
synchronous Ethernet)
• 2-port 10GigE (Ethernet) Adapter card
• 10-port 1GigE/1-port 10GigE X-Adapter card (not supported on the
7705 SAR-8)
• 4-port DS3/E3 Adapter card
• 2-port OC3/STM1 Channelized Adapter card
• 4-port OC3/STM1 / 1-port OC12/STM4 Adapter card
• 4-port OC3/STM1 Clear Channel Adapter card
• Packet Microwave Adapter card on ports that support synchronous Ethernet and
on ports that support PCR
6.4.3 Adaptive Clock Recovery (ACR)
Adaptive Clock Recovery (ACR) is a timing-over-packet technology that transports
timing information via periodic packet delivery over a pseudowire. ACR may be used
when there is no other Stratum 1 traceable clock available.
ACR is supported on T1/E1 CES circuits on the following:
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