Limited Distance Modem; Gandalf Lds 120E And Develcon Ds 511A Limited Distance - Northern Telecom NAC Installation Manual

4-36 Peripheral devices

Limited distance modem

Gandalf LDS 120E and Develcon DS 511A limited distance

553-4011-110 Standard 1.0 November 1994
If you need more than 15 meters (50 feet) between the NAC and any
peripheral, you need to use a limited-distance modem. The limited-distance
modem must be self-powered. The added range depends on the modem you
obtain. Limited-distance modems are recommended for use inside buildings
only.
The following settings are used for a limited-distance modem.
9600 baud rate
8 bits, no parity, 1 stop bit
The Gandalf LDS 120E and Develcon DS 511A limited distance modems
allow you to extend the distance between the NAC and any connected
peripheral by up to a maximum distance of five miles. Other limited
distance modems may not provide the five mile distance. It is your
responsibility to check with the particular manufacturer.
The Gandalf LDS 120E and Develcon DS 511A limited distance modems
can also be used for both the remote supervisor login and the network link.
Refer to the "Remote supervisor login modems" and "Network link
modems" sections for more information.
For each peripheral requiring a limited distance modem, you require the
null modem cable NT7D99AA connected between the modem and the
multiport cable connected at the NAC.
If the peripheral device connected to the second modem is DCE, the
NT7D99AA cable is used to connect the peripheral device to this modem.
If the peripheral device connected to the second modem is a female DTE
connection, the NT1R03Dx cable must be used to connect this modem to
the peripheral device. If the peripheral device connected to the second
modem is a male DTE connection, the NT1R03Ex cable must be used to
connect this modem to the peripheral device.
Figure 4-10 illustrates the hardware configuration required to use the
Gandalf LDS 120E modem with an application module system. Figure 4-11
illustrates the hardware configuration required to use the Develcon DS
511A modem with an application module system.