Wavetek ANT-20 Operating Manual page 38

Optical Interfaces; STM-0/1/4/OC-1/3/12
In Through Mode, anomalies can be inserted in the SOH/TOH or the SOH/TOH bytes can be
manipulated.
Fig. S-6
Block&Replace
Only possible with SDH C4 and C3 mapping and SONET STS3c and STS1 SPE mapping.
The transmitter and receiver are coupled. The received signal is looped through from the
receiver to the transmitter. The ANT-20SE is used as a test channel monitor on the receive side.
The test channel is reconstructed on the transmit side.
Fig. S-7
Jitter can be superimposed on the received signal in through mode when the "Jitter Generator
up to 155 Mbit/s" or "Jitter generator up to 622 Mbit/s" options BN 3035/90.60 to 61 are used.
This applies to all bit rates available in the instrument.
Fig. S-8
S-16
Through Mode: Inserting errors in the SOH/TOH
Block&Replace: Transmitter and receiver coupled
Block&Replace: Jittered through signal
Specifications STM-0/1/4/OC-1/3/12
ANT-20SE