Instruction manual

61200780L1-1C © 2004 ADTRAN, Inc. 154
ATLAS 800 Series System Manual T3 D&I Option Module
DS3 Test
Tx Clock Selects the source of the T3 transmit clock. The following options are available:
LBO Selects the line build out for the T3 transmitter. The following options are
available:
DS3 Test
Write security: 3; Read security: 5
Executes loops and indicates test status.
Prt Read security: 5
Indicates the T3 port under test.
Loopback Write security: 3; Read security: 5
This field indicates the present loopback selected. The following options will
display:
Every T3 connection should have one RECOVERED and one
INTERNAL transmit clock. Failure to configure these clocks will
result in T3 clock slips.
Formats Description
Internal
The ATLAS 800 Series will derive transmit T3 timing from the internal ±20
PPM crystal source.
Recovered
The ATLAS 800 Series will derive transmit T3 timing from the receive T3.
Options Description
Short
0 to 100 feet of cable
Long
100 to 450 feet of cable
Options Description
None
No loopback in effect
Line
T3 line loopback active