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either a no-test or an MDF trunk. A no-test access connects you to the entire
line but a loop request tests only the outside portion. An MDF access is only
connect to the outside portion. Use a no-test trunk when you are fairly sure
the trouble is out of the co and an MDF when you are not sure.
Lrm: Get fast loop resistance measurement
lrm gives you a quick measurement of the DC resistance on a line. Lrm can't
be run unless either the receiver is off-hook or the line is strapped tip to
ring (an intentional short is placed on the line by the repair person). Also,
MLT will not accept an lrm request if there is a hard ground on the line. Lrm
does not access the line so you must already have access to do an lrm. You
can use lrm when you are talking to a repair person who is fixing a coinset.
The resistance values obtained from the lrm can be compared to the old
resistance values that are stored inside each coinset.
MDF(#): Access a specific MDF trunk
MDF(#) lets you choose the MDF trunk that you want MLT to access. Use this
request when an MDF trunk is connected to a telephone line at the MDF but is
not connected to the loop testing system. This may occur in small offices
where the frame attendant doesn't work for the entire day. You can also use
this request when an MDF trunk has to be tested and repaired. The MDF entry
must be a five character entry consisting of the wire center identifier and
the trunk number.
Mdf: Access a main distributing frame (MDF)
MDF connects the mlt testing equipment to an MDF trunk. Before you can enter
any requests, you must have the frame attendant connect the MDF trunk to the
subscriber's line. Remember that MLT automatically accesses a no-test trunk
unless you specifically request an MDF trunk. An MDF trunk goes directly from
the loop testing system to the main distributing frame. Bypassing the central
office switch. Using an MDF trunk allows you to test loops that are connect
to co equipment that is not MLT-testable. Also, you can sectionalize a fault
in or out of the co by testing "in" or "out" using MDF.
MDF(gr): Access a trunk from a certain mdf trunk group
MDF(gr) lets you choose the MDF trunk group from which MLT will choose an MDF
trunk. Use the MDF(gr) request when the NPA-NXX that you are using has more
than one frame associated with it and you can't enter cable and pair numbers.
For example, to request MDF trunk group a, you should enter MDFA in the req
field. To find out which trunk groups are available for your NPA-NXX you can
either enter an mdf or an info request. Remember that you still have to call
the frame attendant to have the trunk and line connected and also disconnect
when you are finished.
Mdfin: Test the inside part of a line
Mdfin starts a series of tests that do an extensive analysis of the inside
line. This includes line circuit and dial tone tests. The mdfin request uses
a special line that runs from the MLT testing equipment to the MDF. You must
ask the frame attendant to connect this line to the subscriber's line. Then
you must enter the telephone number of this special line on the test mask
along with mdfin and the subscriber's number. For more information see the
mdfio module in the MLT-2 user guide.
Mdfout: Test the outside part of a line
Mdfout starts a series of tests that do an extensive analysis of the outside
line. This includes the DC and AC tests. The mdfout request uses a special
line that runs from the mlt testing equipment to the MDF. You must ask the
frame attendant to connect this line to the subscriber's line. Then you must
enter the telephone number of this special line on the test mask along with
mdfin and the subscriber's number.
Mon: Monitor a subscriber's line
Mon lets you monitor a subscriber's line. Sometimes you are a better judge of
whether there is noise, speech, or a recording on a line than MLT is. If you
want to listen to a line to determine if one of these conditions does exist,
use the mon request. You can also be automatically placed in the monitor mode
by MLT in some cases. You will be put in monitor mode if you request ring,
talk or psr but MLT thinks the line is busy, or if you must talk to the
subscriber to run a rev, dial, or tt. A callback number is required. You can
request quick, look, or full while in monitor mode.
Psr: Release a permanent signal
Psr attempts to release a permanent signal in a step-by-step central office.
A permanent signal is a steady dial tone on a line. A frequent cause is a
receiver that is off-hook. Psr lets you remove the permanent signal so that
you can monitor for room noise. If when you monitor the line you still hear
steady dial tone, you should suspect permanent signal on the line. Psr
requires a callback path between your callback line and the subscriber's line.
You should already have the callback path established before you enter a psr
request.
Qin: Run a quick series in toward the co
Qin starts a series of tests that make a "quick" check of the loop toward the
central office. It includes the same tests as quick. It can also identify a
co line circuit if one is present and will report a line circuit if the DC
resistances look like one is present. An MDF access is required for a qin
request. You can use qin to test special switching machines. For example, if
the circuit has 2 loops connected at the frame, qin lets you look at the 2nd
loop (both full & loop only test toward one loop).
Rev: Identify touch-tone polarity reversals