TSW200E1
F1 F2 F3 F4
FAS = 00000000
NFAS = 00000000
MFAS = 0000
NMFAS = 0000
MONITOR - RUN
WORDS
DATA ABCD1 ABCD2
If the frame structure is PCM30 or PCM30C, it is possible to monitor the CAS state for all
30 telephone channels simultaneously. To do this, press <F3> (ABCD1 – channels 1 to 15) or <F4>
(ABCD2 - channels 16 to 30). The channel marked with “
✓
” indicates busy channel; otherwise, the
channel is idle. This analysis takes into account the selected idle code.
Appendix A details the PCM30C and PCM31C frames, making it easy to locate the status
and channel words. For example, when it is desired to monitor in real-time the signalling changes of
the associated channel (CAS) for any telephone channel, choose the value 16 for the timeslot
parameter, and change the frame to monitor the ABCD bits of each channel (Example: Frame=1
indicates channels 1 and 16, Frame=2 indicates channels 2 and 17, etc.).
The figure below demonstrates the realization of a test in the Monitor mode.
5.8 - FREQUENCY/LEVEL Mode
In this mode, the TSW200E1 allows one sinusoidal signal or data from the microphone
to be
inserted in any timeslot of a 2048 kbps G.704 frame. This sinusoidal signal can have user-definable
level (from -55 to +3 dBm0) and frequency (1 to 4000 Hz).
Simultaneously, the TSW200E1 analyses and evaluates, for the same timeslot of a received
frame, the level and the frequency of a sinusoidal signal sampled using PCM A-law. The level
ranges from -55 to +5 dBm0 and the frequency ranges from 1 to 4000 Hz. The TSW200E1 also
monitors, in dBm0, a tone in any timeslot, decoding the structured 2048 kbps signal. Thus it allows
the audio output of one timeslot to be user monitored in the internal loudspeaker.
The frequency/level mode allows testing a voice frequency multiplexed card. The test can be
done by setting analogue loopback on the subscriber end. The performance of this loopback is
evaluated in the 2048 kbps interface.
Besides this analogue loopback, it is possible to employ an analogue frequency/level test to
Wise Telecommunications Industry
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Summary of Contents for TSW200E1
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