Verilink T Lite (34-00292.2) Product Manual - Manual (Page 16)

16 C HAPTER 3: T ESTING
Loopbacks
Equipment Position SW1-5 sets equipment loopback functions. When the
switch is set to Enabled, the unit is placed into an equipment
loopback where the DTE receives all the data it sends. The unit
sends an unframed all 1s pattern to the network end. The unit
remains in equipment loopback until the switch is set to
Disabled.
Figure 3-1 Local Loopback
Network Position SW1-6 sets network loopback functions. NET LOOP
can be set to Auto or Manual. Auto enables the unit to respond
to network loop requests (a 1 in 5 pattern) and remain looped
until it receives a 1 in 3 pattern. Setting the switch to Manual
forces the unit into a manual network loopback until the switch
is returned to Auto. The unit sends an unframed all 1s pattern to
the equipment end unless the equipment is also in loopback.
Figure 3-2 Remote Loopback
Test Jacks
The bantam jacks located on the left side of the unit provide
signal access as follows. The FROM NET and TO NET jacks
can be used to break the network connection to the T Lite
internal circuitry and connect the network to a piece of test
equipment. The NET MON and EQ MON jacks are used for
passively monitoring received signals passing through the unit
(between the DTE and the network). The FROM EQ and TO EQ
jacks can be used to break the equipment connection to the
T Lite internal circuitry and connect the equipment to a piece of
test equipment.
When connected to the TO EQ and FROM EQ jacks, the EQ
LOSS indicator lights. This is due to the test connection and
is not an indication of signal loss from the equipment.
Equipment T Lite Network
AIS
Equipment Network
AIS
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