Motorola 68471 Operation Guide - Page 34

Input Signal, Value Displayed, Differences in CTP Statistics, CTP Loopback Modes, Function, DSU

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Use the CTP "Monitor" function from the Main menu to view these signals. Input Signal RS (Reset) LL (Local Loopback) CL (CSU Loopback) IDL (Idle) CLK (Clock Mode) Value Displayed Normal operating state is "H." Resets the DSU option hardware. When "L", the DSU hardware is locally looping data back to the Vanguard hardware. When "L", the DSU hardware is looping the remote connection's receive to transmit. An "H" informs the DSU hardware to send idle bipolar violations to the remote system. When "H", denotes network clock use. When "L", the DSU option provides the clock. Differences in CTP Statistics CTP statistics output also differs in the following ways: • Detailed Port Statistics show DSU input/output signaling, as well as noting the installed DSU. • Detailed Node Statistics show DSU installation. CTP Loopback Modes Two additional CTP loopback modes now exist. Mode DSU Internal Loopback DSU Internal and External Loopback Function Does not affect the external interface. Loops the local transmit data back to the receive data. Failure indicates no connection. Performs the internal loopback by looping the external transmit to the external receive to allow manual testing of the remote interface. DSU Troubleshooting Use the following information to help troubleshoot installation problems. Potential Installation Problems Installation problems may include the following: • Improper telephone company interface connection • Incorrect DSU port Clock Source option • No signal from telephone company interface

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Use the CTP "Monitor" function from the Main menu to view these signals.
Input Signal
Value Displayed
RS (Reset)
Normal operating state is "H."
Resets the DSU option hardware.
LL (Local Loopback)
When "L", the DSU hardware is locally looping data
back to the Vanguard hardware.
CL (CSU Loopback)
When "L", the DSU hardware is looping the remote
connection's receive to transmit.
IDL (Idle)
An "H" informs the DSU hardware to send idle bipolar
violations to the remote system.
CLK (Clock Mode)
When "H", denotes network clock use.
When "L", the DSU option provides the clock.
Differences in CTP Statistics
CTP statistics output also differs in the following ways:
•
Detailed Port Statistics show DSU input/output signaling, as well as
noting the installed DSU.
•
Detailed Node Statistics show DSU installation.
CTP Loopback Modes
Two additional CTP loopback modes now exist.
Mode
Function
DSU Internal
Loopback
Does not affect the external interface.
Loops the local transmit data back to the receive data.
Failure indicates no connection.
DSU Internal and
External Loopback
Performs the internal loopback by looping the external
transmit to the external receive to allow manual testing
of the remote interface.
DSU Troubleshooting
Use the following information to help troubleshoot installation problems.
Potential Installation Problems
Installation problems may include the following:
•
Improper telephone company interface connection
•
Incorrect DSU port Clock Source option
•
No signal from telephone company interface