ADC HiGain HLU-200 List 2D User Manual page 42

GNLB Loopback Test Procedures
The HLU is now in Logic Loopback. The Loopback Time-out option can be set by the user to:
•
NONE (0 minutes)
•
20 minutes
•
60 minutes
• 120 minutes
These selections determine the duration of this loopback unless it is overridden by the Time-out Override
command or a loop-down command is sent. If the Time-out Override code 1101 0101 1101 0110 (D5D6) is
received, the activation sequence described in step 4, above, is repeated and the automatic timed expiration
of the loopback is inhibited. If this Time-out Override is sent, then the only two ways to loop the HLU-200
down are to:
•
Issue the IR (Intelligent Repeater) LPDN (loop-down) code 1001 0011 1001 0011 (9393)
•
Issue the NI LPDN and Disarm code 11100
The automatic time-out timer is restored during subsequent loopback sessions.
5 Once the test is complete, do one of the following:
• If the system is to loop down but remain ARMED, send the IR (Intelligent Repeater) LPDN code
(universal loop down).
•
If all the equipment is to be looped down, disarmed and returned to normal operation, send the disarm
code 11100.
The ARMED mode has an automatic time-out of 120 minutes but this timer is reset to 120 for any
of the following events:
• Loopback terminates (manually or time-out),
• Query
• Alternate query
• Far end activate
• Another ARM command.
32 February 10, 1999
150-200-124-02, Issue 2
HLU-200 List 2D