Speed-Fault Protection; Active Re-Timing With Jitter Reduction Circuitry - Cabletron Systems MCC-16 User Manual

• Speed-fault protection that prevents stations from causing a beaconing
condition when entering the ring at the wrong speed.
• Dual load-sharing, fully redundant power supplies.
CMs and power supplies that can be installed or removed without
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interrupting the operation of the other CMs and power supply in
the MCC-16.
Support for any combination of interchangeable CMs to provide
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flexibility in choosing media types accommodating a wide variety of
topologies.
Integrated rack-mount brackets that allow the MCC-16 to install into
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any 19-inch rack.
Autowrap feature on RI/RO ports that disables the appropriate port if
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the cable is disconnected or fails – preserving ring integrity.
LANVIEW LED system that reports the status of the physical layer.
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1.1.1 Speed-Fault Protection

The CMs prevent any device from entering the ring at the wrong speed by
wrapping (closing) the port to which the device is trying to insert. This
prevents the device from beaconing the ring.

1.1.2 Active Re-timing With Jitter Reduction Circuitry

Active Re-timing with Jitter Reduction Circuitry uses a dual-digital,
Phase Lock Loop (PLL) that utilizes First-In, First-Out (FIFO) processing
to track and accurately receive even poor quality signals. This circuitry
effectively reduces jitter on a ring and removes jitter budget restraints.
This permits the use of longer cable lengths and mixed media types
without penalty and supports 250 stations per ring.
INTRODUCTION
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