PRODUCT OVERVIEW
Copyright 2007
3-7
S SC150e HARDWARE REFERENCE
The electronic bypass switching action is very fast, introducing a total network disruption
of about one microsecond. This is over 10,000 times faster than mechanical optical
bypass switches, and permits ring re-configuration to be performed in real-time with
minimal impact on the system.
As a repeater, each Quad Switch port converts optical signals to electrical signals. These
signals are re-synchronized and re-transmitted. This allows each connection to the Quad
Switch to be the maximum length for the type of media selected.
The Quad Switch can also perform media conversion. Since each port has a Media Card,
each port can be configured to handle coaxial, standard link or long link fiber. This allows
a signal to arrive on one media type, and go out on another.
Visually, LED’s signify the state of node inclusion in the ring and if carrier is detected. If
the carrier is not detected, the port is put into the Isolate state and the port is bypassed
retaining ring integrity. The auxiliary connector and the associated control cable links the
port to the node allowing the application running the node to switch the Quad Switch in
and out of Include or Isolate state. A manual Include/Isolate switch is used to guarantee
that a node is isolated or that it can be included. A serial-port interface is used to send
message packets to the Quad Switch to perform control functions or to obtain switch
status remotely via the RS-232 or RS-422/485 connection. Two mechanical rotary
switches are used to set the serial-interface address.
3.6.3 Fiber-Optic Cables
Fiber-optic cables may be purchased from Curtiss-Wright Controls or third parties. The
recommended fiber-optic cable is 62.5/125 micron core multi-mode fiber-optic cable with
ST connectors. See Appendix A for part numbers for the fiber-optic cables.
Summary of Contents for SCRAMNet+ SC150e
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