AMT/PTD/PBX/0058/4/6/EN Installation and Maintenance Manual - Aastra 5000
Page 218 01/2011 Description des sous-ensembles
The S0 interface can supply remotely the terminal connected to it. This function is
implemented through a dip-switch. The LD4NX card can be configured to use:
• The -48V trunk or
• On an AXL cabinet only, the 40V ISDN as remote power supply voltage of the S0
interfaces; the current is limited to 100 mA per interface.
-48 V is supplied by the iPBX backplane.
ISDN 40 V is supplied only by the AXL iPBX backplane and by external remote power
supply cards (not provided on AXS).
The card also receives the +5 V supply voltage on the backplane connector (J1), used for
the operation of its internal circuits.
Management of M bit channel by channel
For software releases before 3.2, the 4 equipment interfaces on the card generate the M
bit in the S frame every 800 ms (factory setting). This setting can be changed to 5 ms for
particular ISDN applications (video conference, router) if the set of resistors on the card
(R91 and R67) are modified.
From release 3.2, operation at 5 or 800 ms is determined automatically. The card has its
accesses initialized channel by channel, depending on their configuration:
• DECT M bit S frame: the interface generates the M bit in the S frame to the base
station every 800 ms.
• DECT master base station, DECT slave base station or non-DECT S0 terminal: the
interface generates the M bit in the S frame to the base station every 5 ms. The slave
base station does not use this synchronization; it uses only the 800ms clock
transmitted by the master base station via the third pair.
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