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3-8
Publication 1756-TD008A-EN-P - August 2002
SynchLink Bypass Switch Block
The SynchLink bypass switch block (1751-SLBP) is a DIN-rail mounted
block that is used in daisy chain and ring configurations where a
node, or group of nodes, needs to be temporarily disconnected from
SynchLink without physical reconfiguration of the cable system. The
bypass switch block requires 24V dc.
Figure 3.3 - Components of the bypass switch block
Indicators
+24V dc
(pin 4)
24V dc
(pin 3)
+24V dc
24V dc common
digital input
digital input
(pin 2)
(pin 1)
The bypass switch block has two modes of operation, pass-through
and bypass. The operational mode is determined by the state of the
24V dc digital input that is driven by the local SynchLink station.
The pass-through mode is entered when the digital input is ON. In
this mode, optical signals from the upstream station are received at
the receiver port RxIN1 and retransmitted to the local station via the
transmitter port TxOUT2. Optical signals generated by the local station
are received at the receiver port RxIN2 and retransmitted to the
downstream station via the transmitter port TxOUT1. There is no
re-timing or signal regeneration in this mode.
The bypass mode is entered when the digital input is OFF. In this
mode, signals received from the upstream station at the port RxIN1
are converted to electrical signals, re-timed, and retransmitted to the
downstream station via the port TxOUT1.
TxOUT1
RxIN1
RxIN2
TxOUT2
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