Installation manual

190 20/10/2004 PS10270JENAA01
Description of the card
The LD4N card has four T0/S0 interfaces and is used to manage 2- or 4-channel DECT base
stations.
There are two possible configurations:
Without ADPCM daughter card:
connection to the ISDN network, ISDN terminals or connection of two-channel DECT base
stations.
With one ADPCM 16 daughter card:
the card is used to connect 4 x 4-channel DECT base stations on 1 to 4 of its interfaces; the
other interfaces can be connected to the ISDN network, ISDN terminals or 2-channel DECT
base stations
Fitted with a daughter card, the LD4N card uses the TSs assigned to 2 slots, hence forbidding
equipment sharing the same PCM in the associated slot.
The LD4N card is used to manage the M bit channel by channel: for software releases before
3.2, the 4 equipment interfaces on the LD4N 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 LD4N card has its accesses
initialised 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 synchronisation; it uses only the 800ms clock transmitted by the master
base station via the third pair