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Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
OL-16506-17
Chapter 11 Network Synchronization Support
Network Synchronization Overview
Note The Cisco ASR 1001-X Router does not have an on-board BITS port, hence it does not support those
features that use BITS ports.
Table 11-1 lists the framing modes for a BITS port on the Cisco ASR 1002-X Router.
Table 11-2 lists the framing modes for a BITS port on the other Cisco ASR 1000 Series Aggregation
Services Routers.
You can configure network synchronization on the Cisco ASR 1000 Series Aggregation Services Routers
by using one of the following features:
• Clock Recovery from SyncE
When this feature is configured, the system clock is recovered from the SyncE clocking source
(SyncE-enabled interfaces only). The router uses this clock as the Tx clock for other supported
Shared Port Adapters (SPAs).
• Clock Recovery from an External Interface
When this feature is enabled, the system clock is recovered from a BITS clock source.
• Clock Recovery from a GPS (10M) Source
Table 11-1 Framing Modes for a BITS or SSU Port on the Cisco ASR 1002-X Router
BITS or SSU Port Support
Matrix
Framing Modes
Supported
SSM or QL
Support Tx Port Rx Port
T1 T1 ESF Yes Yes Yes
T1 T1 SF Yes Yes Yes
T1 T1 D4 Yes Yes Yes
E1 E1 CRC4 Yes Yes Yes
E1 E1 FAS Yes Yes Yes
E1 E1 CAS Yes Yes Yes
E1 E1 CAS CRC4 Yes Yes Yes
2048 kHz 2048 kHz Yes Yes Yes
Table 11-2 Framing Modes for a BITS or SSU Port on the Other Cisco ASR 1000 Series
Aggregation Services Routers
BITS or SSU Port Support
Matrix
Framing Modes
Supported
SSM or QL
Support Tx Port Rx Port
T1 T1 ESF No No Yes
T1 T1 SF No No Yes
E1 E1 CRC4 No No Yes
E1 E1 FAS No No Yes
E1 E1 CAS No No Yes
E1 E1 CAS CRC4 No No Yes
2048 kHz 2048 kHz No No Yes