
5-64 Modems
553-4001-111 Standard 1.0 March 1997
For a NAC 1 system, the second Gandalf LDS 120E or Develcon DS 511A
modem is connected to the terminal concentrator through the NT9D8001
cable. A male DB-25 connector is attached to the second Gandalf LDS
120E or Develcon DS 511A modem’s female DB-25 socket, with the RJ-45
connector attached to the terminal concentrator.
Gandalf LDS 120E modem settings
The following settings are necessary for the Gandalf LDS 120E modem to
be used:
• Termination: T (330 OHM)
• Internal Jumper Plugs: 4
-wire mode, J13-J14 connected and J15-J16
connected
• Front Panel Push-button Switches: ALL OUT
- TP - RL - DL - AL
Table 5-7 lists the external DIP switch settings for point-to-point,
full-duplex for the Gandalf LDS 120E. Table 5-8 lists the internal DIP
switch settings for point-to-point, full-duplex.
Table 5-7
LDS 120E external DIP switch settings for point-to-point, full-duplex
Switch number Switch setting
1 OPEN (OFF)
2 CLOSED (ON)
3 CLOSED (ON)
4 CLOSED (ON)
5 CLOSED (ON)
6 NOT USED
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