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Table 3. Data Port Options (2 of 3)
Bilateral Loopback
Possible Settings: Enable, Disable
Default Setting: Disable
If enabled, when a DSU loopback is initiated, a local DTE loopback is also automatically
initiated. A Bilateral Loopback can be started by the ATI or by detection of a V.54 Loop 2
Up sequence.
Enable – When Bilateral Loopback is enabled, running a DSU loopback also
automatically starts a local loopback. The local loopback ends when the DSU loopback
terminates.
Disable – Running a DSU loopback does not start a local loopback.
Carrier Control by RTS
Possible Settings: Constant, Switched
Default Setting: Constant
Simulates Constant or Switched Carrier operation.
Constant – The internal RTS is forced on and the DSU is in a constant Data Mode on
the transmit line. The external RTS lead is ignored. The actual signal on the line is either
all ones (DMI) or DTE transmitted data.
Switched – RTS is monitored and CMI codes are transmitted when RTS is off.
CTS Control
Possible Settings: Standard, Follow RTS, Forced On, Circuit Assurance,
Short Delay, Medium Delay, Long Delay
Default Setting: Standard
Specifies the operation of the Interchange Circuit CT106, Clear to Send (CTS), which is
an output from the DSU.
Standard – CTS follows the internal RTS with a fixed delay, except that CTS will be off
when a network interface related alarm is detected or a test is active. The active test
may be initiated locally, remotely, or by the network.
Follow RTS – CTS follows the external RTS lead without delay, regardless of alarms
and tests.
Forced On – CTS is always forced on after the unit is powered up with a successful
self-test.
Circuit Assurance – With circuit assurance, CTS operates the same as the Standard
option, except that CTS will also be deasserted when CMI codes are being received.
Short Delay – CTS operates as described for the Standard option except that a 50 ms
delay is inserted before CTS is turned on and after RTS is turned on.
Medium Delay – CTS operates as described for the Standard option except that a
150 ms delay is inserted before CTS is turned on and after RTS is turned on.
Long Delay – CTS operates as described for the Standard option except that a 500 ms
delay is inserted before CTS is turned on and after RTS is turned on.
12
December 1998
7520-A2-GN10-10
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