thinder@NSWC-WO.ARPA (07/29/87)
We have recently installed a group of Racal Vadic 4224E
modems to serve as dial in access to our local area network and to
selected host machines. Prior to this installation these
connections were handled by Ven Tel MD212 modems with no problems.
Soon after cut over we received complaints from a few users
that they could no connect to the LAN using a variety of PC's/
terminals and modem combinations. After investigation it "seems"
that the problem is related to our modem/phone line and "ring".
If a user dials into the rotary and the modem answers without any
ring, the users modem may not "see" the connection. It is not
consistent, sometimes a line will answer with a ring then a tone
nine times in a row, then on the 10th time fail, the reverse also
occurs.
To further compound the problem, one line that is connected
to a VAX and Racal Vadic modem ALWAYS provides one ring and then
the modem tone.
I have more information about the connection, including the
cabling and specifications of the network devices. Rather than
list all this information I will respond to any questions
concerning the problem directly.
Any help or suggestions would be greatly appreciated.
Thomas K. Hinders
Naval Surface Weapons Center
Silver Spring MD
(301) 394 4225/1802
thinder@nswc-wo.arpa
or
thinder@nswc-oas.arpa