Ericsson LBI-39076B system manual Troubleshooting, No interconnect or radio-to-radio

MAINTENANCE LBI-39076B

TROUBLESHOOTING

The hardware used in the ELI system is extremely reliable, making component failure the unlikely cause of most problems. The most common causes of problems are as follows:

1.Site Controller Computer - The Site Controller may have a version of the Application Software that does not support the ELI option, a personality that does not specify the ELI option, telephone interconnect parameters that are not adequately defined in the database, or a PROM leg bent under a PROM during installation of new Application Software or Personality.

2.GTI Unit - A GTI Unit may have jumper positions that are incorrect for type of telephone line connected, DIP switch settings that are incorrect for the radio channel / line number, user-configurable parameters that are not correctly defined in the database, or no telephone line connected.

3.Interconnect Cable - An interconnect cable may be missing, be connected to the wrong connector, or have a pin pushed back in a connector.

Table 9 lists some of the possible causes and the corresponding corrective action for various symptoms that might be observed. It is assumed that non-interconnect calls (such as group calls) are operating normally for the LIDs and GIDs to be used for interconnect calls.

Table 9 - Troubleshooting Symptoms

SYMPTOM	POSSIBLE CAUSE(S)				CORRECTIVE ACTION
No interconnect calls can be placed to	The GTI unit (that is connected to the				Make sure that the PCM Bus
or from a MASTR II or IIe Repeater	repeater) is connected to an open or				Termination is connected to the
channel, and the GTI unit connected to	unterminated	PCM/Data	bus.	An	PCM/Data bus at the highest channel
this channel won’t stay synchronized.	unterminated section of PCM/Data bus				end.
or	can act as an antenna to pick up stray				Make sure that the PCM/Data bus is
	signals that	could interfere	with	the
					connected between all GTI units.
No interconnect or radio-to-radio	synchronization of the GTI unit,
calls can be placed to or from a	causing it to continually reset in an				Check for defective PCM/Data bus
MASTR III Repeater channel, and the	attempt to regain synchronization.				cable.
transmitter stays keyed all the time
(“TRANSMIT” LED on System
Module stays lit).
All radio-originatedinterconnect calls	Improper software upgrade.				Check the software of the GTIs and
get stuck DTMF tone and tone					upgrade all GTI old software to the new
continues to non-interconnect calls.					release.
All radio-originated interconnect calls	The Dial Tone Required parameter is				Set the Dial Tone Required parameter
from all LIDs get rotary hunt tone.	incorrectly set to Y for E&M lines				to N in the System Configuration area
	(E&M lines have no dial tone).				of the GTI Configurator.
	All telephone lines are not connected or				Check connections and operation of the
	failed.				telephone lines.
	Two or more GTIs have different				Check the version of the software in
	software versions belonging to different				each GTI. If all versions do not belong
	software releases. (All GTIs in a system				to the same software release, upgrade
	must use software versions belonging to				all older software to the newer. Do not
	the same software release.)				mix software from different releases.

(Continued)

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