amichiel@rodan.acs.syr.edu (Allen J Michielsen) (10/13/90)
I have 2 vms machines seperated by several miles. I need to run decnet
between them, and desire to do this at higher baud rates tnan those dec
officially supports. I also have a quasi political requirement to use
the 'new' hi-tech DOV lines available in this area. (DOV=data over voice)
I have the DOV lines installed, the modems installed, and the basic link
between them and with the serial ports of the vax's debugged. Being basically
overly optimistic, we started at like 9.6 & 19.2 Kb. Each vax will go into
the 'starting' mode but that's all, and the modem lights flash at each end.
DEC says that higher baud rate telephone links are problematic because of the
data compression, error recovery, and flow controll they generally contain.
the phone compant says that all of that is disabled on this line with no
improvement. I have heard some rumours that even the standard 9600 trailblazer
serial decnet modem link often needs some tweeking of parameters to establish
and maintain a stable link. Of course this doesn't seem to be documented
anywhere, so I need help. Any and all constructive suggestions will be gladly
received, here or via email.
System (s): VMS 5.0.2 at one end, VMS 5.0.1 at the other with VWS 4.0
8820++DFH32--txa00--DOVmodem~~~~~~~~~~~txa06--cxy08++3500(station)/8+U.Lic.
(Either actual interface card # may be flawed as I don't have my notes...)
The DOV interface has he following options, Async or Sync up to 19.2Kb.
(both modems need to have switches set, then reset for each change...)
We have RTFM completely, and worked through all the trouble shooting sections,
fixing all the obvious (or obvious things after reading it...) possible stuff.
We also have called in the local 'experts' at dec, phone co, and CSC. None
have been terribly specific of helpful in their recommendations.....
Thanks,
al
--
Al. Michielsen, Mechanical & Aerospace Engineering, Syracuse University
InterNet: amichiel@rodan.acs.syr.edu amichiel@sunrise.acs.syr.edu
Bitnet: AMICHIEL@SUNRISE