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Switch S1-3: Circuit Assurance
On dedicated circuits, the transmitter and the CTS output can be
configured to go On only when a working communication circuit is
established. If Circuit Assurance is used, enable it on only one end of
the communication link.
Circuit
S1-3 Assurance Description
On Enabled CTS will go low and the
transmitter will be held off if the
receiver is in the No Signal state
or CD is low
Off Disabled The transmitter and CTS will
operate without regard to the
receiver state
Switch S1-4: RTS
The RTS input can be forced on, ignoring the terminal’s RTS
signal. RTS controls the transmitter by either sending the user’s data
or sending an idle code.
S1-4
RTS Description
On Forced On Transmitter is always ON
Off Follows The RTS input controls the
DTE Signal transmitter
Switches S1-5: Data Rate
This switch controls the data rate on the line (RJ-48S port) and
must match the speed of your digital service.
S1-5
Setting
Off 56 kbps
On 64 kbps
6
Switches S1-1 and S1-2: Clock Mode
The setting for switches S1-1 and S1-2 determines the transmitter
clocking mode for the Model 2450.
S1-1
S1-2 Clock Mode Description
On Off External (DTE) Transmit clock derived
from terminal interface
Off On Network (Looped) Transmit clock derived
from the received line
signal; Use this mode
for Dedicated DDS
operation
Off Off Internal (Master) Transmit clock derived
internally
On On Campus Clock Transmit clock derived
from received line
signal. Allows remote
device (in
campus
clock
mode) to initiate
V.54 loopback. For use
only in campus short-
haul configuration.
(Note: Local device
must be in
internal
clock mode.)
5
S1 SUMMARY TABLE
Position Function Factory Default
S1-1 Clock Mode Off
S1-2 Clock Mode On
S1-3 Circuit Assurance Off Disabled
S1-4 RTS On Forced On
S1-5 Line Rate Off 56 kbps
S1-6 Front Panel Switches Off Enabled
S1-7 DTE Loop Control On Disabled
S1-8 Receive RDL Off Enabled
Network
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