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Design and implementation of the operation and maintenance software for a new GSM transcoder - page 16 / 26

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© NOKIA16 paavo.markkola@nokia.com18.10.2005

Implementation, HDLC channels

HDLC channel is connected to a time slot in a PCM line

Link Access Protocol – channel D (LAPD) protocol is used on top of HDLC channels to established links to other systems

TCSM2 has five HDLC channels; one to BSC (16 kb/s) and four to ET plug-in units (64 kb/s)

TCSM3i has four channels but their usage depends on the role of the unit

All units have BSC connection

Cabinet head master has two connections to the external clocks

Cartridge master has two connections ET plug-in units (Ater and A interfaces

Master has one connection to ET plug-in unit (A interface)

HDLC channel configuration needs an update; PCM time slot etc.

For simplicity LAPD process tries to establish all four links

Only links using a working HDLC channel can get up

LAPD process must also be able to send messages through proper link according to their destination

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