Racal-Vadic_18008-067_VA2440,45_PSGX_Modem_Installation_Operation_Manual_May1985.pdf

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Racal-Vadic
VA2440,45 P/S/G/X MODEM
INSTALLATION/OPERATION
MANUAL
Publication No. 18008-067
...,.-~.
~u~lication
No.
18008-256
\'
~
Addendum to The VA2440
Installation and Operation Manual
Use this addendum with The VA2440,45 p/S/G/X
Installation and Operation Manual, publication
number 18008-067.
The VA2440 modem has been enhanced to include
4-wire leased-line operation formerly available in
the VA2430 modem. The new model is identified as
the VA2440K. This addendum provides information
required for 4-wire operation. However, note that
switch C2 has been changed which will affect
2-wire operation.
VA2440 addendum
1
August 4, 1986
This page is an addition to page 2-10:
Installation
For 4-wire operation with the 1S044-XXX cable, the
4 spade lug connections are identified as follows:
~'lhi
te
Black
Green
Red
=
Receive Tip
=
Receive Ring
=
Transmit Tip
=
Transmit Ring
VA2440 addendum
2
August 4, 1986
-
:~
The following is an addition to page 4-1:
Testing
In the 4-wire leased-line configuration, no tests
are available.
VA2440 addendum
3
August 4, 1986
This page replaces Table 5-1 on page 5-2:
Table 5-1.
Switch/
strap
Al
A2
A3
A4
standard setting
p/S/X
G
K
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
VA2440 Factory-Set Options
Option Selected
Local Copy disabled
105 ms Turnaround Delay. Disabled
for K model
106 ms Clear To Send (CTS) delay
p/S/X Models--Data Terminal Ready
(DTR) controlled by the terminal
equipment
G
and
K
Models--DTR forced
ON
Attended disconnect operation
Terminal control of fall back (1200
bps operation) disabled
Data Set Ready (DSR) OFF in test
mode
Internal clock selected
~
P/S/X Models--Receiver sensitivity
set to
-50
dBm
G
and
K
Models--Receiver sensitivity
set to -35 dBm
Constant carrier with forced RTS
Constant carrier without RTS
Receiver equalizer disabled
Answer tone frequency set to 2025 Hz
Bell 201B/C (V.26B) encoding
(*
strap b replaced with 1 kohm
resistor)
p/S/X Models--Chassis DLB switch
forces answer tone
G and K Models--DLB switch turns on
transmitter for remote test
Analog loopback (ALB) test
controlled from chassis front-panel
switch only
p/S/X Models--Line current
disconnect enabled
G and K Models--Line current
disconnect disabled
2-wire and 4-wire operation
Bl
B2
B3
B4
Cl
ON
ON
OFF
ON
ON
ON
ON
OFF
ON
ON
OFF
ON
ON
ON
OFF
C2
C3
C4
ON
OFF
OFF
IN
ON
OFF
OFF
OFF
OFF
OFF
IN
a
b
IN
*
IN
*
OUT
*
OUT
c
d
IN
OUT
IN
IN
IN
e
IN
WI
W2
a
a
a
a
b
b
VA2440 addendum
4
August 4, 1986

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