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Chapter 6 - Implementation of hardware
6.1
Interface card
LDT cards, possibly fitted with one or two ADPCM32B daughter cards are used to connect
DECT base stations to a NeXspan 500.
LDT cards have T0/S0 interfaces for managing 2- or 4-channel DECT base stations. There are
two versions of each card:
•
LDTA: 8 T0/S0 interfaces
•
LDTB: 16 T0/S0 interfaces
LDTA cards allow sixteen 2-channel DECT base stations to be connected, and LDTB cards eight
2-channel DECT base stations. 4-channel base stations can be connected by adding one or two
daughter cards ADPCM32B. An ADPCM32B card can manage eight 4-channel base stations.
6.2
Configuring the LDT card
6.2.1 References and equipment
LDTA
LDTB
ADPCM32B
AVADQ
LDTA cable
LDTB cable
LDTA cable
LDTB cable
(1)
Note:
(2
Note:
transmitted to the LDT cards via the back plane
AMT/PTD/PBX/0020/2/4/EN
Designation
16 T0/S0 interfaces for 2- or 4-channel DECT base stations
8 T0/S0 interfaces for 2- or 4-channel DECT base stations
Daughter card for managing 8 x 4-channel DECT base
stations
Synchronous bus link plug (loop DECT clock recovery is not
possible with this plug)
LDTA-distribution frame link cable
LDTB-distribution frame link cable
LDTA-distribution frame link cable
LDTB-distribution frame link cable
Table 1: References and equipment
This cable allows to transmit DECT clock 800 ms by the distribution frame.
New LDT cable to use when the synchronization signal is sent via the loop and
on NeXspan 500
(1)
(1)
(2)
(2)
01/2007
Reference
HJ4758A
HJ4758B
HJ4402B
HR5124B
HG4302A
HG4302B
AHG0013A
AHG0013B
Page 119
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