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A 25-second watchdog timer is activated between the
35 TIP bytes and 35 LSC bytes, between the 35 LSC
bytes and 100 LBE bytes, and between the 100 LBE
bytes and 32 FEV bytes. The timer requires the
correct receipt of the latter sequences less than 25
seconds after receipt of the prior sequence. This
prevents inadvertent setting of the latching loopbacks.
Latching loopbacks for the FT1 system are
deactivated by transmitting the following latching
loopback sequence in the primary DS0 of the FT1
system:
Minimum of 35 TIP bytes (N0111010).
4. LOOP UP STATE
In the loop up state, the active FT1 loopback will
provide a continuous loop for the FT1 bandwidth.
The data flow is continuously monitored for the loop
deactivation commands to deactivate the loopbacks.
Also, a 20-minute loopback time out is checked. If
the loopback time out is enabled, any loopback that is
in the loop up state for 20 minutes will be deactivated.
A-4
Section 61180405L1-5, Issue 1
61180405L1-5A
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