Re: 7857 Modem not compatible with a 7852

Update on 7852-400 compatibility with 7857's

With the latest flash level update (3.15c - contact IBM for a copy) the
7852-400 is now supposed to be compatible with 7857's up to the 7857's
maximum speed of 19.2Kbps.  (I think that was actually fixed at flash
level 3.14c, and the 7852-400's were originally shipped with 3.13c).
At level 3.15c it's also supposed to fix some compatibility problems
with other modems when the connection speed is greater than 9,600bps.

If you have 7852-013's and are having problems with them, you may want
to try asking IBM nicely if they will replace them with 7852-400's.


Neil Palmer wrote:
> 
> Neil Palmer wrote:
> >
> > The 7857's should be compatible with other synchronous modems (ie. 5853,
> > 7855-010, 7852-400, UDS etc.) at speeds of 9600bps and lower.
> > I know in sync mode at 19.2Kbps you can only talk to another 7857.
> > (that probably applies to 12K/14.4K/16.8K as well).
> > If you set the switches on a 7852-400 for 9600bps it will dial out at
> > 9600bps - BUT if you dial INTO the 7852-400 it will ignore the switch
> > settings and handshake a higher speed.  You would need to reprogram the
> > modem to connect at a lower speed (just a wild guess here - the manual is in
> > the office - but it may be the &S4 setting).
> 
> Checked the manual - it's the S48 register setting.
> 
> >
> > On Mon, 5 May 1997, Doug Barnes wrote:
> >
> > > Has anyone else experienced this problem?
> > > I spent 2.5 days trying to get two 400s to talk to each other and
> > > finally a support line guy mentioned that the modems we were using
> > > were incompatible. But of course it is not a defect (?????????).
> > > Fortunatley I had a 7852 (I think the # is right it is one of the
> > > Options by IBM 33.6/28.8 modems) to use and it connected on the first
> > > try.

-- 
...Neil Palmer                                      AS/400~~~~~      
...AS/400 Technical Specialist      ____________          ___  ~     
...NxTrend Technology - Canada      |OOOOOOOOOO| ________  o|__||=   
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...Phone: (905) 731-9000  x238       oo      oo   oo  oo   OOOo=o\   
...e-mail: npalmer@nxtrend.com    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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