VeEX VePAL TX300M, User Manual

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This function captures and analyzes the DS3 (44.736Mbits/s) pulse shape. The purpose of maintaining the correct pulse shape is
to reduce inter-symbol interference – if the logic 1s and 0s cannot be detected by the receiver correctly, bit and code errors will
result.
The pulse amplitude and overall shape are superimposed and compared with the Telcordia TR-TSY-000499 and ITU-T G.703
pulse conformance template. Telecommunications signals require specific load impedance for pulse mask compliance testing to
be accurate. When high frequency pulses are transmitted down a transmission line, a portion of the pulse will be reflected when
and wherever it encounters an impedance mismatch. The reflection is proportional to the impedance mismatch (i.e., the greater
the mismatch, the greater the reflection of the pulse).
DS3 Pulse Mask
Left/Right button
: To move the pulse mask to the left or right, press the Left or Right button first and re-run the test.
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12.6 DS3 FEAC
DS3 FEAC responses (Far End Alarm and Control Channel Responses)
Enabling this option allows loopback to be configured from any “far-end” equipment connected on the other end of the line. These
can be used to send and receive loop up codes and information from the far-end T3 device. Enable or disable this option through
a drop-down menu in this field.
Loop Up Activate: 00010010 11111111 sent >10 repetitions
Loop Down Deactivate: 00100100 11111111 sent >10 repetitions
FEAC alarms are sent from the remote end device towards the local device by means of the C bit in the Subframe. When a
failure is declared on the remote end unit, this is how it notifies the near end unit. Some FEAC Codes are shown below.
FEAC Tasks TX Setup
TX300S_e-manual_D07-00-064P_RevA00