Telos Zephyr User Manual page 102

You can tell whether you have V.35 or X.21 by looking at the
connectors. These are the " footprints" of the two types.
Each V.35/X.21 connection conveys both send and receive digital signals.
A single- port cable has only one V.35/X.21 plug, while the two- port cable version has
two V.35/X.21 plugs. A two- port cable may be used for single- port applications by
simply letting the unused plug go unconnected.
The compact plug at one end of the cable snaps onto the mating connector on the
Zephyr with a locking action. To release the plug, the two pushbuttons at either end of
the plug housing are pressed simultaneously and the plug is withdrawn.
The plugs at the other end are labeled "PORT 1" and "PORT 2" and are connected
to the TA/CSU as follows:
One Port Operation
•
For one- port mono operation, only the PORT 1 plug is used. It connects to the
TA/CSU V.35/X.21 socket.
•
In the MONO/DUAL mode, when used for just one mono audio program, only one
V.35/X.21 connection is required. Audio channel A corresponds to PORT 1 and
audio channel B corresponds to PORT 2.
V.35/X.21
INTERFACE
(MINI-DB40)
TELOS
ZEPHYR•
102
Section 6
X.21
IMPORTANT!
We had to use a small socket in order to make more room on
the rear panel (sorry), so you cannot plug directly into it with
off-the-shelf cables. You must have the appropriate cable from
Telos to connect!
The V.35/X.21 interface, while a single physical plug, has two
electrical ports, of which one or both may be used.
PORT1
PORT
(V.35/X.21)
ISDN TERMINAL
PORT2
(NOT USED ADAPTOR
FOR ENCODE)
NON-ISDN NETWORKS
V.35
ISDN S/T
TERMINAL
(RJ-45)
(RJ-45)
ISDN NT-1
LINE
(RJ-11)
To ISDN
Network