AMT/PTD/PBX/0058/4/6/EN Installation and Maintenance Manual - Aastra 5000
Page 260 01/2011 Description des sous-ensembles
4.14 Equipment cards
4.14.1 LA16X card
4.14.1.1 Description
The LA16X card is used to connect 16 analogue set lines to an iPBX.
4.14.1.2 Functional description
The LA16X card mainly ensures:
• The transmission of the status and command signals between the UCV card and each
analogue set:
- the commands for analogue sets: for each connection a ring signal command
supplied by the UCV card authorises passage of the current to the analogue set
connected.
- the statuses from the analogue sets (on/off hook detection)
• Voice transmission and conversion:
- in digital form, from the UCV card to the analogue sets
Each of the 16 PCM TSs exchanged with the UCV card is the medium for the voice
carried over the line of an analogue set.
- in analogue form, from the analogue sets to the UCV card.
- This transformation uses parameters for converting digital signals into analogue
signals, and analogue signals into digital signals.
- These parameters stored initially in the UCV card are loaded into the memory of
the LA16X card when the latter is started.
• A power supply function: the LA16X card receives the following on the backplane
connector (J1):
- +5 V, -5 V used for the operation of its internal circuits,
- -48 V used to supply the analogue set lines,
- 70 V AC of the ringing current for each of the analogue sets connected.
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