KE LOGEM 928, Operation Manual

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138 Operation Manual V.34 - Modems, Version 07/97
Chapter 6
Dial Backup Features
6.3 Installation of the DBU Board (Rackmounted Version)
Remove all cables from your LGM 28.8D1 and extract the modem from
its rack or the switching box. Remove the protective caps (9) to open the
housing (ref. to fig. 6.4). Then extract the screws 4 and 5 using a
screwdriver. Now you can take out the modem board from the casing.
LOGEM
®
LGM
28.8D1
Da/T
e
Hör
er
Answ
. PM1
S1
M1
Leitung
9
4
5
Fig.: 6.4 LGM 28.8D1 Installation of the DBU board
Place your modem if front of you as shown below and remove the jumpers
BR3...BR5 at the position ST5. Then remove the jumpers BR6...BR11 at
ST4. Keep the jumpers in a safe place as you need them after a
deinstallation of the dial backup board.
1
23
4
5
6
7
8
9
1
0
ON
1
23
4
ON
1
32
c b a
S1
S2
OPEN
S3
1 2 3 4 5 6
• • •
• • •
ST2
ST1
BU2
S4
BU3
BU1
D5
D4
++
++
• • •
1
2
3
• • •
• • •
•
17
• •
• • • • • • • • • •
• • • •
• • • •
20 11
10 1
ST4
1 5
2 6
SET1
SET2
SET3
SET4
SET5
SET6
SET7
SET8
SET9
SET10
SET11
SET12
SET13
SET14
LB1
• • • •
• • • • 1
5
4
8
ST6
Fig. 6.5: Main Board of the LGM 28.8D1