STRAP
IDENTITY
FUNCTION
POSSIBLE SETTINGS
FACTORY
SETTINGS
Data Rate
(Kbps)
0 = 19.2 Kbps
1 = 14.4 Kbps
2 = 9.6 Kbps
3 = 7.2 Kbps
4 = 4.8 Kbps
5 = 3.6 Kbps
6 = 2.4 Kbps
7 = 1.2 Kbps
Determines the data rate.
2 = 9.6 Kbps
INT
EXT
RCV
ASY
XMT TIMING
Determines whether the transmit-timing signal
comes from the internal clock, external clock, or
receive clock, or whether the unit operates in async.
INT (Internal Clock)
2W
4W
2W/4W
Determines whether the unit uses 2 wires or 4
wires.
4W (4 wires)
0 ms
8 ms
64 ms
CTS DELAY
Determines the RTS-to-CTS delay
8 ms
Determines the transmit carrier mode.
ON: Transmit carrier is constantly ON.
CTRL: Transmit carrier is ON only when RTS is
high.
CTRL should be used in multipoint
applications.
ON
CTRL
ON
CARRIER
0 dBm
-3 dBm
-6 dBm
-9 dBm
Determines transmit-output level to the line.
XMT LEVEL
0 dBm
600
300
150
LOW
150 [ohms]
Determines transmit-line impedance.
For Multi-point applicatoins, set the master
modem to
LOW
XMT
IMPEDANCE
RCV
IMPEDANCE
Determines receive-line impedance.
For Multi-point applications, set the master
modem and the last modem in line 10 150; set all
others to HIGH.
150
300
600
HIGH
150 [ohms]
EN
DIS
EN
PIN 18
Enables/Disables Analog loopback command from
the DTE on Pin 18
PIN 21
Enables/Disables Remote loopback command from
the DTE on Pin 21.
RLB EN
RLB DIS
RLB EN
STRAP
IDENTITY
FUNCTION
POSSIBLE SETTINGS
FACTORY
SETTINGS
SWITCH
Enables/Disables control of the DIG, ANA, and REM
loopbacks with the front-panel pushbuttons.
EN
DIS
EN
GND
Connect: Connects Signal Ground to Chassis
Ground.
DIS: Isolates grounds from each other.
CONNECT
DIS CONN
CONNECT
AGC
ON: AGC always ON.
CTRL: AGC ON if DCD is ON, remains at last level
of amplification if DCD goes OFF.
ON
CTRL
ON
V.54 Delay
ON: Activates V.54 delay, preventing multiple
loopback of tail-end circuits.
OFF: No delay
ON
OFF
OFF
S3 and S4 determine character lengths when unit is
in async mode.
S3
S4
BITS
OFF
OFF
8
OFF
ON
9
ON
OFF
10
ON
ON
11
10 Bits
S2 determines amount of stop-bit shortening for
async mode.
ON = 25%
OFF = 12.5%
12.5%
S1 is not used.
ASYNC
LENGTH
