ADC HiGain H2TU-C-388 User Manual page 54

Testing
4 Once armed, the H2TU-C-388 can be looped back by sending Intelligent Office Repeater (IOR) LPBK
activation code 1101-0011-1101-0011 (D3D3) for at least 5 seconds. You should observe the following
activation response pattern in the order presented:
a 2 seconds of AIS (all ones pattern)
b 2 seconds of returning data pattern
c Logic errors (including the frame bit) occurring in the returned pattern comprising:
– 231 errors, if IOR LPBK (H2TU-C-388) was sent
– 20 errors, if ILR-2 (H2TU-R) was sent
d normal looped data
This error pattern repeats every 20 seconds as long as the IOR loopback pattern is being sent. This also applies
to ILR, Time-out Override, and Query commands.
The H2TU-C is now in logic loopback if the IOR NLOC loopback command was sent. The Time-out
Override command or a Loopdown command can override the selection made for the loopback time-out (see
"Setting the Loopback Time-out Option" on page
(D5D6) is received after activating a loopback, then the automatic timed expiration of the loopback is
inhibited. If this Time-out Override is sent, then the only way to loop the H2TU-C-388 down is to do one of
the following:
•
issue the Intelligent Repeater (IR) loopdown (LPDN) code 1001-0011-1001-0011 (9393)
•
issue the NI LPDN and Disarm inband code 11100 or the ESF-DL code (FF24).
The Time-out Override function is only valid for the current active loopback. 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 LPDN code.
•
If all the equipment is to be looped down, disarmed, and returned to normal operation, send the disarm
inband code 11100 or the ESF-DL code (FF24).
The Armed mode has an automatic time-out of 60 minutes but this timer is reset to 60 for any
of the following events:
• Loopback terminates (manually or time-out)
• Query
• Alternate query
• Far End activate
• Another ARM command
This timer is inhibited while any of the valid command codes are being sent. Once the codes
are removed, the timer restarts at 60.
46
42). If the Time-out Override code 1101-0101-1101-0110
June 6, 2000
152-388-100-02, Issue 2
H2TU-C-388 List 1