KE LOGEM 928, Operation Manual

Page: 140 / 200

140 Operation Manual V.34 - Modems, Version 07/97
Chapter 6
For operation without a dial backup board the connectors La, Lb, E,G, a2
and b2 have to be allocated. A 2 wire leased line operation is possible via
the La and Lb connectors as well. The FKS8 jack at the front panel of the
LGM 28.8D1 is connected in parallel to the 96pole connector as well.
Please notice that only one access type is possible for your appli-
cation! It is not applicable to utilize the FKS8 and the 96pole connector
at the same time!
The optional DBU board comes with active Tx(a), Tx(b), Rx(a) and Rx(b)
connectors. The Tx pins have to be connected for 2 wire leased line
operation with the dial backup board.
The allocation of the VG connector changes according to the selected
switching alternative if the modem operates at telephone access lines
with CEPT standard (ref. to fig. 6.8). In such cases the allocation of the
connectors is performed using jumpers that are installed at the dial backup
board. The jumper positions for the three possible switching alternatives
are printed on the reverse (contact) side of the DBU board. For the
operation mode 2 or 4 wire leased line with dial backup the FKS8 jack is
switched in parallel to the dial line connectors of the 96pole connector.
1
2
3
4
5
6
7
8
9
2/4-Draht-Standltg.
1
2
3
4
5
6
7
8
9
2/4-Draht-Dial Backup
1
2
3
4
5
6
7
8
9
4-Draht-Dial Backup
Tx (a) Tx (b)
Rx (a)
Rx (b)
2-Dr.
a2
b2
La
Lb
Tx/Rx (a) Tx/Rx (b)
Tx (a)
Tx (b)
Rx (a)
Rx (b)
La
Lb
a2
b2
Fig. 6.8: Allocation acc. to CEPT
Dial Backup Features