KE LOGEM LGH 28.8D1, Operation Manual, Page: 139 / 200

139 Operation Manual V.34 - Modems, Version 07/97
Chapter 6
The connectors ST4, ST5 and ST6 are designed to contact with the dial
backup board.
Remove the DBU board from its black antistatical packaging. At the
component side of the board are three connectors that fit into the
connectors of the main board. Fix the DBU board with the component
side down on the main board and check for proper installation. Fix the
board with the safety screw M2 x 5 as shown in fig. 6.6.
1
23
4
5
6
7
8
9
1
0
ON
1
23
4
ON
1
32
c b a
S1
S2
BU2
S4
BU3
BU1
D5
D4
++
++
• • • •
• • • •
Fig. 6.6: LGM 28.8D1 with DBU Board
6.4 Telephone Access Line Selection
The 96pole connector is electrically allocated acc. to CEPT standard.
The telephone lines are allocated according to the line operation mode.
In delivery state the modems are allocated in a way that is taking care of
all possible switching alternatives (ref. to fig. 6.7).
1
2
3
4
5
6
7
8
9
G
La Lb
Tx (a)
Tx (b)
Rx (a)
Rx (b)
a2
b2
E
c
b a
Fig. 6.7: Allocation of the 96pole Connector (delivery state)
Dial Backup Features