Black Box LRU4240 - Manual (Page 100)

88 SALES: 0870 90 10 750 Dual Trunk E1 Router User’s Guide
Dual Trunk E1 Router
Current user initiated tests
terminate themselves without user
intervention. • Misconfiguration for Menu-9A
Timeout.
• Make sure the system is set to run
the test for an unlimited amount of
time.
• Test length options are 15 min., 1
min., 60 min., Unlimited.
With Self Test, Loop Up Remote
and Loop Down Remote, Unlimited
does not apply.
• If the above step does not correct
the problem, call Black Box
Technical Support for assistance.
The system cannot be put into
network loopback from the remote
unit. • Unit does not recognize Loop
command being sent.
• Loopback detect is disabled on
unit.
• Circuit is down or in Loop towards
remote unit.
• Make sure the remote unit is
sending the correct loop code.
• Make sure the system is set to
receive the same standard or
alternate code as the remote unit.
• Using your E1 test set, send a loop
up code into the system. If the
system still does not loop up, call
Black Box Technical Support for
assistance.
The system cannot be put into
payload loopback from the
network. • Framing protocol choice.
• Wrong timeslots used for test
signal.
• Make sure the system is set for
T1.403 Annex B fractional
loopback code, if the network is
sending T1.403 Annex B to loop it
up.
• Make sure the payload portion you
are attempting to loop up has
assigned bandwidth.
• If the LRU4240 still does not loop
up, use your E1 test set to inject a
fractional loopback signal into the
payload you wish to loop up.
• If the above steps fail, call Black
Box Technical Support for
assistance.
After power-up, the menu clock no
longer shows the correct time or
date. • Time not set. • Set the time in Menu-4.
• If the time is still incorrect, call
Technical Support.
Table 11-1 Unit Problems (2 of 4)
Symptom Probable Cause Solution