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Installation and Maintenance
V
olume
Octel Overture 200/300 Serenade 3.0
PB60014–01
Solutions for Trunk Problems
Perform
the following steps to solve trunk problems:
1.
Make sure the transmit and receive portions of the cable are not reversed. If it is possible to swap the
transmit and receive parts of the cable, do so, and check to see if the DTIC comes up.
2.
Make sure the cable is not broken. Find a loopback cable to loop the DTIC to itself. If it comes up,
the cable could be a problem.
3.
Make sure the PBX is sending a correct E1 framing pattern. T
ry looping the PBX to itself and seeing
if it operates with what it receives.
4.
Check that the PBX and DTIC both are in the same CRC4 mode — either both disabled or both
enabled.
5.
Make sure that the impedance switches (sw1 and sw2) on the DTIC are set correctly according to
cable type. Both switches
must
be set the same.
6.
Check the alarm queue on the DTIC for clues about why it is down. Log on to the card and enter
LIST ALARM.
For example,
@CONN 2
Connecting to E1 in slot 2
dtic>LIST ALARM
03/22/97 08:05:25 Trunk Loss of Signal
03/22/97 08:05:25 Trunk Out of Frame
03/22/97 08:05:25 Trunk Traffic Disabled
03/22/97 08:05:25 Trunk Out of CAS Multiframe
dtic>EXIT
Disconnecting from E1
7. Check
the LEDs on the front of the card for trunk problems. The LEDs have the same information as
the status screens although without as much detail. However
, if you are unable to get terminal access
to the system, the LEDs might be a good alternative. The meanings of the LEDs are as follows:
LED Meaning
Red boot (top)
Apcode is initializing
Green Power
DTIC has power
Red 1 (top)
Loss of signal on trunk (LOS)
Red 2
Loss of frame on trunk (LOF)
Y
ellow 3
Remote alarm indication (RAI)
Y
ellow 4
“Other” trunk alarm
Y
ellow 5
Alarm history
Green 6 (bottom)
One or more ports of
f hook
.
All red LEDs should be OFF when the card is correctly initialized.
If LEDs Red 1 and Red 2 are ON, it indicates that there is no
incoming clock, possibly due to incorrect cabling.
For further help, contact T
echnical Support.