TeCHnICal DaTa anD TrOuBle SHOOTInG |
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Replaceable modules
While we do not expect you to do much repair or troubleshooting of the individual circuit boards, the
system does have several removable modules which can be replaced. The system has the following replace-
able modules:
1.
Power Supply
2.
ISDN Line interface card
3.
Analog POTS Line Interface
Fuse Replacement
A fuse is located on the power supply PCB. If fuse replacement is required, note: For continued protection
against fire, replace fuse only with same type and value.
Access to the Main PCB
The main PCB, closest to the bottom of the enclosure, is mounted component-side down. You can gain ac-
cess to the component side of the PCB without taking it out by removing the bottom plate of the enclosure box.
5.6 ISDN Cause Phrases/Values
When there is an ISDN problem in the network, a phrase appears in the ISDN protocol log that communi-
cates information about the cause of the trouble.
CLASS 1.1 (normal)
Cause No. 1 - Check number, redial (unallocated number)
This cause indicates that the called party cannot be reached because, although the called party number is in
a valid format, it is not currently allocated (assigned).
Cause No. 2 - No route to network /Prefix 0 dialed in error
This cause indicates that the equipment sending this cause has received a request to route the call through a
particular transit network which it does not recognize. The equipment sending this cause does not recog-
nize the transit network either because the transit network does not exist or because that particular transit
network, while it does exist, does not serve the equipment which is sending this cause.
or
This cause indicates the prefix 0 is invalid for the entered number
Cause No. 3 - No route to dest./Prefix 1 dialed in error
This cause indicates that the called party cannot be reached because the network through which the call has
been routed does not serve the destination desired. This cause is supported on a network-dependent basis.
or
A 1 was dialed when not required. Redial without the 1.
Cause No. 4 – No prefix 1/Special Information Tone
The prefix 1 is not required for this number
or
This cause indicates that the called party cannot be reached for reasons that are of a long term nature and
that the special information tone should be returned to the calling party.
