S2-4
RDL Type
Off
Initiate a V.54 RDL loop when selected
On
Initiate a CSU loopback when selected
SWITCH SW2-5 FRONT PANEL SWITCHES
As the Front Panel Switches may be inadvertently toggled, or in the
event that the end-user may not need to use the switches, the installer
may disable the front panel switches. Set Switch S2-5 to determine
whether the front-panel toggle switches are active or inactive.
SW2-5
Option
Off
Front Panel Switches Enabled
On
Front Panel Switches Disabled
SWITCH SW2-6: V.54 RESPONSE ENABLED
(DEFAULT)
V.54 Response is a special in-band loopback facility that sends a pseu-
do-random pattern over the data stream. This is the only loopback that
the unit can initiate. This is useful for campus applications when you
need to put a remote unit in loopback. The unit responds to the V.54
loopback command, and the whole process takes only a few seconds
to complete. When V.54 Loopback is disabled, the unit will not be able
to send or respond to V.54 loopback commands. The duration of the
loopback is limited by the loopback timeout setting.
SW2-6
Option
Off
V.54 Response Enabled
On
V.54 Response Disabled
9
44..00
IIN
NSSTTA
ALLLLA
ATTIIO
ON
N
Once the Model 2701 is properly configured, it is ready to connect
to the G.703/G.704 interface, to the serial port, and to the power
source. This section describes how to make these connections.
4.1 CONNECTING TO THE G.703 NETWORK
The Power, G.703/G.704 and serial Line connections are located
on the rear panel of the Model 2701. The following sections describe
operation of these connections.
4.1.1 Connecting the 2701/D (X.21 version) Dual Coaxial Cable (75
ohm) to the G.703 Network
The Model 2701/D (X.21 version) is equipped with dual female
BNCs (TX and RX) for connection to a 75 ohm dual coax G.703 net-
work interface. If your G.703/G.704 network terminates via dual coaxial
cable, use the diagram below to make the proper connections. See
Figure 3 below.
NOTE: The outer conductor of the coax cables are isolated from
system earth ground.
When using the 75 Ohm interface, jumper straps JP3, JP6, JP7,
and JP8 must be installed over the jumpers. The jumpers are located
next to the BNC connectors. Refer to the following section to open the
case. Open the case and install jumper straps for JP3, JP6, JP7, and
JP8.
4.1.2 Opening the Case
Open the case by inserting a screwdriver into the slots and twist
the screwdriver head slightly. The top half of the case will separate
from the lower half of the case. Take caution not to damage any of the
PC board mounted components.
10
Data TO
Network
Data
FROM
Network
Figure 3: Rear Panel, Showing Location of Connectors.
TX
RX
