User's Manual

Chapter 10: DMC8 debug port
Overview
The ability to monitor messages on the DMC8 card is an important aid to resolving problems
on DECT
. Monitoring messages is an important part of the Serviceability program for DECT.
Use the information in this Appendix to identify how far messages are travelling, and where
they are getting lost in the system.
For example, an investigation of a DMC card lockup problem shows that messages are leaving
the PBX through LD 77, coming into the DMC card through the DS30 monitor, and being sent
to the Cordless Controller Unit (CCU) through the IPC monitor. It is verified that there is a
problem on the CCU because there are no responses from the CCU, although the "Hello
messaging" is ok.
DMC card
The DMC is divided into the following sections:
•
CCU section that is primarily derived from the existing Philips DAS CCC hardware
• Backplane Conversion Unit (BCU) section that connects to the CCU
The BCU section of the DMC includes software to connect the Philips system to the PBX
backplane. It effectively makes the CCU look like an Intelligent Peripheral card to the system.
In fact, the DMC emulates an analogue line card with 32 handsets attached.
The CCU (Philips part) is connected to the BCU (Avaya part) through a 2Mbit EuroISDN link.
Figure 219: DECT interface on page
328 shows the components of the DECT interface. For
the purposes of this Appendix, the BCU is the key component. For preliminary investigations,
the DS30 monitor and Inter Processor Communications (IPC) monitor are the most important
points to monitor from the DMC card.
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