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Connect Modem to a M1 / 1000M

Connect a US Robotics 56K Modem to a 2400bps TTY Port by wbaith
Posted: 31 Jul 04

Setting up the US Robotics
56k Modem at 2400bps

1.    Before starting, change dip switches 3 and 8 on the back to the down position.
2.    Connect the modem to the PC using a standard modem cable.
3.    Start ProComm/Hyperterminal and connect using any speed, 8 data bits, 1 stop bit, no parity and the terminal setting to ANSI BBS.
4.    After the connection is established, enter ôATö.  The modem should return ôOKö.
5.    With the desired settings in hand, enter ôATI4ö to display the current modem settings.
6.    To change the settings on the top line of commands, type "AT" immediately followed by the desired setting.  For example, to change X4 to X1, enter ôATX1ö.
7.    To change the middle set of commands (&xx), enter ôAT&xxö.  For example, to change &A3 to &A1, enter ôAT&A1ö.  All of the changes can be made on one line by continuing the string, i.e. ôAT&A1&B1&U2ö.
8.    To change the S register numbers, enter "ATSr=n" where r equals the resister number and s equals the desired value.  For example, to change the value in S002 from 043 to 040, enter ôATS2=40ö.
9.    Once the settings are correct, they must be transferred to the NVRAM.  The NVRAM holds two tables of data, called Y0 and Y1.  These tables are used to set up the modem at power up.  Either table can be used, but for consistencyÆs sake, use Y0.  The setting that tells the modem where to look at power up is located in the first line at the Yx (see #6) setting.  To save the settings in Y0, enter ôAT&W0ö.
10.    To verify the settings were saved, enter ôATI5ö.  This will display the settings in both the Y0 and Y1 NVRAM tables.
11.    One last test, power down and then back up the modem.  Enter "ATI4" and the settings should reflect the changes.
12.    Turn the modem back off, place dip switches 3 and 8 in the up position and switch 4 down.

Following are the NVRAM settings for running at 2400bps.
U.S. Robotics 56K FAX EXT Settings...

   B0  E1  F1  M1  Q0  V1  X1  Y0

   &A1  &B1  &C1  &D2  &G0  &H0  &I0  &K0
   &M0  &N3  &P0  &R1  &S0  &T5  &U2  &Y1

   S00=001  S01=000  S02=043  S03=013  S04=010  S05=008  S06=002
   S07=060  S08=002  S09=006  S10=014  S11=070  S12=050  S13=000
   S15=000  S16=000  S18=000  S19=000  S21=010  S22=017  S23=019
   S25=005  S27=000  S28=008  S29=020  S30=000  S31=128  S32=002
   S33=000  S34=000  S35=000  S36=014  S38=000  S39=000  S40=001
   S41=000  S42=000

U.S. Robotics 56K FAX EXT NVRAM Settings...

 Template Y0

   DIAL=TONE   B0  F1  M1  X1

   &A1  &B1  &G0  &H0  &I0  &K0  &M0  &N3
   &P0  &R1  &S0  &T5  &U2  &Y1

   S00=001  S02=043  S03=013  S04=010  S05=008  S06=002  S07=060
   S08=002  S09=006  S10=014  S11=070  S12=050  S13=000  S15=000
   S19=000  S21=010  S22=017  S23=019  S25=005  S27=000  S28=008
   S29=020  S30=000  S31=128  S32=002  S33=000  S34=000  S35=000
   S36=014  S38=000  S39=000  S40=001  S41=000  S42=000

Back to Nortel: CS1000 (Meridian) systems FAQ Index
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