Aastra X series Installation And Implementation Manual page 75

LD4 and LD4NX cards.
The LD4 et LD4NX cards have four T0/S0 interfaces and are used to manage 2- or 4-channel
DECT base stations. The T0/S0 interfaces are configured by MMC:
• as T0 for connection of an ISDN network basic rate interface,
• as S0 for connection of an ISDN terminal or DECT base station.
The LD4 et LD4NX cards also allow the connection of four 2-channel DECT base stations or four
4-channel DECT base stations if they are equipped with an ADPCM16 card.
Note: The installation of an LD4 or LD4NX card in an unrackable NeXspan S12 is possible if
the back plane has been added (optional).
Basically, the unrackable NeXspan S12 cannot receive expansion cards.
Basically, the rackable NeXspan S12 is fitted with a back plane and can receive
3 expansion cards (RJ format).
The LD4NX card is used to manage the M bit channel by channel. For software releases earlier
than 3.2, the 4 equipment interfaces on the LD4NX (LD4N mode) 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 LD4NX
card has its accesses initialized channel by channel, depending on its 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.
UCT-S, UCTS-12 and UCT-C cards.
The UCT-S, UCTS-12 and UCT-C are NeXspan S, NeXspan S12 and NeXspan C have four T0/
S0 interfaces.
The T0/S0 interfaces are used to connect:
• Four 2-channel DECT base stations (on UCT1-S) and 4-channel DECT base stations (on
UCT2-S/UCT3-S fitted with an ADPCM16 daughter card)
• Two 2-channel DECT base stations (on UCT1S-12) and 4-channel DECT base stations (on
UCT2S-12/UCT3S-12 fitted with an ADPCM16 daughter card)
• Two 2-channel DECT base stations (on UCT1-C) and 4-channel DECT base stations (on
UCT2-C fitted with an ADPCM16 daughter card)
The T0/S0 interfaces are configured by MMC and by jumper position, see
Figure 4-17:):
• as T0 for connection of an ISDN network basic rate interface,
• as S0 for connection of an ISDN terminal or DECT base station.
Page 4-75 10/2008 AMT/PTD/TR/0020/2/7/EN