Lucent Technologies 5ESS-2000, Инструкции по эксплуатации и техническому обслуживанию

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measurement.
The gain slope measurements involve making loss measurements at the following three frequencies and levels:

404 Hz at -16 dBm

1004 Hz at -16 dBm

2804 Hz at -16 dBm.
The three frequencies are used to measure the bandwidth of the trunk which is the range of frequencies that the
trunk can transmit.
Table 7-3 summarizes the ROTL responder interpretation of the MF signals from CAROT or other locations. The
column labeled "MF Signals" shows the sum of two frequencies. The power of the two tones is measured as though
the tones were continuous.
There are four columns called "LAYER" numbered 0 through 3. These indicate the state of the MF receiver in the
responder. The first two layers, 0 and 1, are used only for a near-end responder interfacing with a ROTL. The
purpose of layer 0 is to inform the responder (in the ROTL office only) that the impedance of the trunk under test is
600 ohms, that the office is arranged for testing at test point 0, and that the far-end test line is code 100, 102, or
105. This information is transmitted via the first MF pulse received in the 0 layer of the MF receiver. When the
responder in the ROTL office is in the 0 or 1 layer, no MF information is forwarded to the far end of the trunk under
test.
The release MF signal in any layer causes the responder to signal the test line that the trunk under test should be
released. If the two pulses are received in succession, then the responder will signal the ROTL that the trunk under
test should be made busy and then released. A delay of 200 ms is begun, after the receipt of the first 900 Hz plus
1300 Hz MF signal, to check for the occurrence of another 900 Hz plus 1300 Hz MF signal within that interval.
The layer MF pulse causes the MF detector in the responder to go to the next higher state (for example, from layer 0
to layer 1). When an MF signal other than RL or layer is received with the MF receiver in layer 0, it must shift to layer
2 so that the next MF will be interpreted as a test instruction and be transmitted to the far end of the trunk under test.
Note that the far-end responder is initially in layer 2. Layers 0 and 1 signals are not transmitted to the far end.
When the responder is used with a code 105-type test line or a miniresponder is used at the terminating end of the
trunk under test, the initial state of the MF receiver must be layer 2. This is necessary because the first MF pulse will
contain test rather than conditioning information. At the conclusion of a transmission test, CAROT normally sends a
release digit (MF 5 digit) to accomplish the following:

Release the test equipment

Return the trunk to its prior test condition

Recycle ROTL in preparation for a new set of priming.
The CAROT can also send a release/make-busy command (two MF 5 digits). This command recycles ROTL but
leaves the trunk in an out-of-service/maintenance/CAROT (OOS/MTCE/CAROT) state. The CAROT can also send
a recycle command (1 second, 1300 Hz) which has the same effect as the release. The recycle command can be
given at any time and is also used at the conclusion of each nontransmission test command to recycle ROTL. The
ROTL responses to the previous three commands are summarized in Tables 7-4 and 7-5 .
Table 7-4 ROTL Responses to Recycle, Release, and Release/Make Busy After Transmission Tests
235-105-210 October 1999
Copyright © 1999 Page 12