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CHAPTER 4: Operation
Continue with standard operating procedures to select menu options.
At the end of the options, the system briefly displays “Command Accepted”
and returns to the DTE OPTIONS menu with the Transmit Clock selection
active.
Table 4-14. Transmit Clock Commands.
Front Panel
AT Command
Description
1=NORMAL
&X0
TX clock from CSU/DSU selected
2=EXTERNAL
&X1
ETC clock from DTE selected
NOTE
The External clock option is normally used in modem tail circuit
applications. A CSU/DSU to modem interconnect diagram for this
application is shown in
Fig. B-1.
The External clock option is also recommended when the EIA 232
connector is used for 56 Kbps applications. A special CSU/DSU SW56
cable diagram for this application is shown in
Fig. B-2
. Using this option
and special cable eliminates data errors caused by excessive delays in
the DTE transmit clock receiver and transmit data driver.
Submenu 6 CS Options
The CS OPTIONS menu is used to select one of five different control modes
for the Clear to Send (CS) lead.
Menu Map
3=CONFIG/1=LOCAL/2=DTE OPT/6=CS OPTIONS
Operation
Follow standard operating procedures. When 6=CS OPTIONS is flashing,
press the Enter button. The first of the submenu items is displayed.
Summary of Contents for CSU/DSU MS/DBU
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