Card, Adapter Card, and Port Command Reference
Page 116 7705 SAR OS Interface Configuration Guide
DS1 and E1 Commands
clock-source
Syntax clock-source {adaptive-timed | loop-timed | node-timed}
Context config>port>tdm>ds1
config>port>tdm>e1
Description This command specifies the clock source to be used for the link transmit timing. Adaptive timing is
supported only if the port is used for TDM pseudowires.
The clock source setting also determines the node sync reference if the port is configured as one of the
node sync references (config>system>sync-if-timing>{ref1 | ref2}> source-port command). Refer
to the 7705 SAR OS Basic System Configuration Guide for more information.
Default loop-timed
Parameters adaptive-timed — clocking is derived from the incoming pseudowire packets from the MPLS
network
loop-timed — the link recovers the clock from the received data stream
node-timed — the link uses the internal clock when transmitting data
framing (DS1)
Syntax framing {esf | sf | ds1-unframed}
Context config>port>>tdm>ds1
Description This command specifies the DS1 framing to be used for the port.
The ds1-unframed parameter allows the configuration of an unstructured DS1 channel on a T1/E1
ASAP Adapter card. When a DS1 unframed channel is shut down, it sends the AIS pattern to the
far-end DS1. The far end does not react to the AIS pattern if the far-end DS1 is configured as
unframed. If the far-end DS1 is configured as framed, the far end declares AIS. The operational status
remains up and no alarms are generated while the near end is operationally down. This is normal
behavior for unframed G.703 mode.
Default esf
Parameters esf — configures the DS1 port for extended superframe framing
sf — configures the DS1 port for superframe framing
Note: If BITS is used as a timing reference on a dedicated T1/E1 port, the port must be
configured as loop-timed.
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