Cabletron Systems MMAC-Plus SFCS-1000, Configuration Manual

Page: 233 / 404

B-81
AMI Configuration Commands
B.8.7.5 Configuring SONET Port Timing
This command allows the user to change the timing source on a port on a
SONET network module.
NOTE:
This option is not available on an OC-12 net-
work module because it always uses internal
timing. To configure distributed timing on an
OC-12 network module, use the
configura-
tion module timing commands.
Enter the following parameters:
localhost::configuration port sonet>
timing <port> (network | internal)
port Indicates the port number from which the timing is
being derived.
network|internal Designates the source of the transmit clock. For all
network modules,
network means that the timing
for this port is derived externally from the incoming
clock on this port.
Internal means that the timing is
derived from either the on-board crystal oscillator or
is derived from a specific port number on a Series C
network module that is defined by the user. If set to a
specific port number, the transmit clock is derived
from that port if available. If the port source becomes
unavailable, the on-board crystal takes over as the
transmit clock source.