
Configuring the PortMaster 3 11-13
Using the T1 Expansion Card
When you specify internal, the built-in 1.544MHz crystal sets timing on the line. This
is useful for dry wire configurations, or for back-to-back connections. When you specify
external, the built-in DSU/CSU extracts timing from the line.
Configuring the T1 Expansion Card for Fractional T1The T1 card is identified as line2 in the PortMaster 3. Follo w these steps to configure the
PortMaster 3 to use fractional T1 service:
1. Set the line for fractional T1.
Command> set line2 fractional
2. Set the channel group for fractional T1.
Command> set line2 group Cgroup channel Channel-list
3. Set the channel rate.
Command> set line2 group Cgroup 56k|64k
Note – 56Kbps is typically used for D4 framing while 64Kbps, the default, is used for
other framing types.
4. Save the configuration and reboot the PortMaster.
Command> save all
Command> reboot
Note – If you reboot the PortMaster before setti ng the group and the channel for
fractional T1, you lose the line.
Configuring the PortMaster 3 for Full T1
To configure the card for full T1, enter the following commands:
Command> set line2 t1
Command> save all
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