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4-42 Peripheral devices
Remote diagnostic modems
553-4011-110 Standard 1.0 November 1994
The Remote Diagnostic allows Northern Telecom to diagnose your NAC
system whenever you experience difficulties. Often the solutions can be
sent back through this link directly to your system. Consult your service
contract for more details about the remote diagnostic service.
The Remote Diagnostic Link is the cable which connects the AM to the
modem. Using an RJ-45 cable, attach the DB-9 connector to the NAC
octopus cable. Connect the DB-25 connector (which is at the other end of
the cable) to the modem. The modem is connected to the telephone
network. Figure 4-9 shows the cable arrangements for the Remote
Diagnostic Link.
For the Remote Diagnostic modems, the following standards must be met.
1200 or 2400 baud rate
auto-answer capability
accessible from the public switch telephone network
In order to obtain the Remote Diagnostic support for your NAC system,
you must connect a modem to the Remote Diagnostic Link. The cabling
arrangement for the remote diagnostics port is shown in Figure 4-9.
The following modems are supported for remote diagnostics.
NetComm SmartModem M7F
Racal VI2422PA
UDS 2440
The cable between NAC I/O panel and the remote diagnostic modem is a
DB-25 (male) to DB-9 (female) modem cable, NT7D61Ax. This cable is
connected to the I/O panel at Card 1, Conn 2.
The cable between the remote terminal and the diagnostic modem is a
straight-through DB-25 serial cable NT1R03Dx (male to male) or
NT1R03Ex (male to female). The cable type depends on the configuration
defined by the user. Figure 4-12 illustrates this connection for a NAC
system.
The modem settings at the NAC end must be done before connecting the
modem to the NAC. This is accomplished by first connecting the modem to
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