31
CHAPTER 4: Operation
Submenu Items
• Data Mode—Current operation mode of the CSU/DSU MS/DBU.
• Loop is Normal—Current status of the network interface.
• Loop XX—Indicates the rate of the service from the network.
• DTE 56K Sync—Indicates the DTE data rate and format.
• DBU Status Idle—Indicates the status of the DBU function .
Possible messages: IDLE, DIALING, or DATAMODE.
• TR SR LLB RLB—Lists four of the DTE interface leads.
• Off/On—State of the respective leads displayed immediately above.
Operation
Follow standard operating procedure.
To view additional information, press the Up or Down scroll key.
Two new lines of information will be displayed.
To exit the Status menu, press the Cancel key.
4.6 2=TEST
The CSU/DSU MS/DBU is able to perform a variety of tests that allow
problems in specific components of the communications circuit to be isolated
and identified. These various test modes for the CSU/DSU MS/DBU are
initiated and terminated from either the front panel or the DTE interface.
When operating in asynchronous mode, AT commands can be used to
control the testing from the DTE interface. For synchronous operation,
V.25bis commands can provide the test control.
The unit also responds to standard DDS network tests initiated from the
telephone company test centers. In addition, it can run several tests such as
local and remote loopbacks to aid in problem isolation. There are six built-in
test patterns that can be used with both local and remote loopbacks. See
Fig.
4-10
.
Summary of Contents for CSU/DSU MS/DBU
Page 100: ...99 NOTES ...
