18
MULTIPORT CSU/DSU
Switch S2-7: Data Set Ready During LOCAL Loopback Test
Use Switch S2-7 to control the behavior of the DSR signal at the DTE interface
during the local loopback test.
Table 3-12. Settings for Switch S2-7.
S2-7
Setting
On
DSR is on during local line loop
Off
DSR is off during local line loop
Switch S2-8: Circuit Assurance
On dedicated circuits, you can configure the transmitter and the CTS output 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. Use Switch S2-8 to
configure circuit assurance.
Table 3-13. Settings for Switch S2-8.
S2-8
Circuit 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.
