User`s guide

6-4 DL3100 User’s Guide—November 1998
6
of the data is performed by the DL3100. This minimizes any impact that
the DL3100 might have on the data so that network problems can be
isolated.
DTE Loopback
The DTE Loopback on the T3MB veriÞes the operation of the signal path
from the DTE equipment, through the T3 framer, and back to the DTE
connectors.
Running this test loops the network transmit signal to the DL3100Õs
network receive circuitry. If everything is working properly, the DTE
equipment will receive the same signal that it transmitted. The T3 network
transmitter continues to transmit towards the network as long as the unit is
in DTE loopback.
Send FEAC Code
The Send FEAC code has two options:
¥ LoopupÑputs the far end unit into network loopback mode
¥ LoopdownÑdisables the loopback mode
Testing the HSDB/HVDB DTE/Network Interface
The HSDB and HVDB feature a bi-directional DTE/Network Loopback
diagnostic test.
You use the HSDB or HVDB Tests Menu to initiate this loopback.
To access these menus the HSDB or HVDB must be the selected device.
From the HSDB/HVDB Main Menu select Tests and press Return.
The HSDB and HVDB Test Menus are exactly the same, except for the
menu name.
Figure 6-2 shows an example of the HVDB Tests Menu.