ADC H2TU-C-388 User Manual

Page 54

Testing

152-388-100-02, Issue 2

June 6, 2000

H2TU-C-388 List 1

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:

2 seconds of AIS (all ones pattern)

2 seconds of returning data pattern

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

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 42

). If the Time-out Override code 1101-0101-1101-0110

(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).

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 Time-out Override function is only valid for the current active loopback. The automatic
time-out timer is restored during subsequent loopback sessions.

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.