AT&T SB67030 Administrator's Manual page 164

To configure the T1 settings: (Continued)
Figure 156. T1 Settings, Part 2
System Configuration
Synapse Administrator's Guide
164
4. Select the Clock Source for Gateway
synchronization:
Network. The telephone network maintains
an extremely accurate timing source.
Local. A clock source that is internally
generated in the CSU (Channel Service Unit).
5. Select the Line Buildout value from the drop-
down list. The value and it units are determined
by whether the CSU is on your premises or not.
The default value is 0-133 feet/ 0 db.
For short haul installations, where a CSU is at your
location, the T1 Gateway supports Line
Equalization based on the distance between the
T1 Gateway and the CSU in feet. Estimate the
cable length and select accordingly.
For long haul installations, where the T1 Gateway
connects directly to a Network Interface Device,
the T1 Gateway supports Line Attenuation.
Estimate the line loss and set the Line Buildout
value accordingly.