Applications For Stm-1; Monitoring Stm-1, Full Test (Approx. 25 Min - Wavetek ANT-20 Operating Manual

ANT-20SE
5

Applications for STM-1

Most of the applications described in the following sections are also available as "quick check"
versions.
5.1

Monitoring STM-1, full test (approx. 25 min)

Monitoring/Analysis of unknown STM-1 SDH signals
Fig. SA-5
Connecting the item under test
The electrical or optical output socket of the item under test is connected to input [16] or [17] of
the receiver (RX) for the "Monitoring STM-1, full check (approx. 25 min)" application.
Note: If you want to feed high power (> 0 dBm) optical signals into socket [17], use the
Measurement
The "ANT-20 NEXT" software automatically detects whether the optical or the electrical input is
being used. The equalizer is switched in for electrical receive levels (ITU-T or PMP) to
compensate for any possible line attenuation.
The application then starts a measurement to typify the line by establishing the signal type
present at the receiver:
• STM-1 with AU-4 structure
• STM-1 with VC-12 structure
• Unknown (if a LOF-STM alarm is detected, e.g. because of an incorrect bit rate)
The clock frequency deviation of the incoming signal is measured. The measured value will be
displayed if it is more than ±2 ppm.
Standard Applications
Monitoring/Analysis of unknown STM-1 SDH signals
(optional) built-in power splitter of the ANT-20 or another attenuator to reduce the level.
ANT-20 NEXT
SA-19