Instruction manual

61200780L1-1C © 2004 ADTRAN, Inc. 143
ATLAS 800 Series System Manual T3 Option Module
DS3 Test
Frame Configures the framing format for the T3 circuit. Selections are M13 or C-BIT.
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:
Options Description
Recovered
Unit derives transmit T3 timing from the receive T3.
Internal
Unit derives transmit T3 timing from the internal ±20 PPM crystal source.
Every T3 connection should have one RECOVERED and one
INTERNAL transmit clock. Failure to configure these clocks will
result in T3 clock slips.
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