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- DDN MGT Bulletin 100 DISA DDN Defense Communications System
- 11 August 1992 Published by: DDN Network Info Center
- (NIC@NIC.DDN.MIL) (800) 365-3642
-
-
- DEFENSE DATA NETWORK
- MANAGEMENT BULLETIN
-
- The DDN MANAGEMENT BULLETIN is distributed online by the DDN Network
- Information Center under DISA contract as a means of communicating
- official policy, procedures and other information of concern to
- management personnel at DDN facilities. Back issues may be read
- through the TACNEWS server ("@n" command at the TAC) or may be
- obtained by FTP (or Kermit) from the NIC.DDN.MIL host [192.112.36.5]
- using login="anonymous" and password="guest". The pathname
- for bulletins is ddn-news/ddn-mgt-bulletin-nn.txt (where "nn" is the
- bulletin number).
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-
- Correction to CODEX Modem Procedures
-
- 1. Several users have pointed out that DDN Management Bulletin 95 was not
- solving their problems when logging onto TAC dial-in circuits using CODEX
- modems. Upon reviewing the proposed workaround, DISA determined that a
- portion of the workaround had been omitted from the management bulletin.
- This bulletin corrects that oversight.
-
- 2. Bulletin 95 stated that script or login files could be modified to pause
- approximately 6 seconds, and then transmit the control-q character. In
- addition to the pause, a carriage return must be added to the script
- after the control-q. If this fails to cause the TAC banner to be
- transmitted to the terminal, a second carriage return should be added to
- the script. It has been our experience that this process allows users of
- modems that do not have the Microcomm Network Protocol (MNP) to operate
- with the CODEX dial-in modems. For users that do not use script or login
- files, the workaround would be as follows.
-
- a. Dial the TAC as usual.
-
- b. After receiving the connect message on the modem, transmit
- control Q.
-
- c. If the TAC banner does not print on your terminal, wait a few
- seconds and then transmit a carriage return.
-
- d. If this fails to cause the TAC banner to be displayed, repeat
- the process from step b.
-
- If you do not receive the TAC banner after two attempts, contact the
- NIC (1-800-365-DNIC) for assistance.
-
- 2. The difference between the CODEX modems and the AT&T modems (beside speed)
- is that the CODEX modems implement an error-correcting option called
- the Microcomm Network Protocol (MNP). If you have a modem that uses MNP
- level 4 or 5, you will not experience the 6-second pause. The CODEX
- modems will still ignore the control Q, but the sequence <control Q,
- carriage return> should cause the TAC to issue the banner. If this
- fails, lower your speed setting to 1200 BPS and try again. Remember
- that the AT&T modem's maximum speed is 1200 BPS. If this also fails,
- contact the NIC for assistance.
-
- 3. If the NIC is unable to solve the problem, it should be escalated to the
- CONUS MILNET Monitoring Center for action since these modems are currently
- used only in CONUS. Please contact the Monitoring Center at
- 1-800-451-7413.
-
- 4. This bulleting was prepared by Maj Tatchio, MILNET Mgr, HQ DISA,
- DSN 222-7580, commercial (703) 692-7580.
-
-