AT&T SB67060 T1 Installation Guide Page 112

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System Configuration 111
Synapse Installation Guide
To configure the T1 settings: (Continued)
Figure 122. T1 Settings
3. 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).
4. Select the Line Buildout value from the drop-
down list. The value and its 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.
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