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Magnum P80F & P80C Personal Switches Installation and User Guide (07/03)
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processing resumes. This flow-control sequence occurs in a small fraction of a second and is
transparent to an observer. See Section 4.6 for additional details.
Another feature implemented in Magnum P80 & P80F Personal Switches is a
collision-based flow-control mechanism (when operating at half-duplex only). When the Switch
detects that its free buffer queue space is low, the Switch prevents more frames from entering by
forcing a collision signal on all receiving half-duplex ports in order to stop incoming traffic.
The latency (the time the frame spends in the Switch before it is sent along or
forwarded to its destination) of the P80 & P80F Personal Switches varies with the port-speed
types, and the length of the frame is a variable here as it is with all store-and-forward switches.
For 10 Mb-to-10 Mb or 10 Mb-to-100Mb or 100Mb-to-10 Mb forwarding, the latency is 15
microseconds plus the packet time at 10 Mb. For 100Mb-to-100Mb forwarding, the latency is 5
microseconds plus the packet time at 100Mb.
2.6 Features and Benefits
100Mb switching services for high performance Ethernet LANs
Magnum P80 & P80F Switches provide Fast Ethernet switching on all ports.
They perform high speed filter/forward operations on the traffic, giving each
port’s segment a full 100Mb (or 10 Mb) of bandwidth.
Option for one “future-proof” fiber ports connector, Model P80F
Built-in fiber ports may be ordered with 100Mb full-duplex mm ST, SC, MTRJ
and single-mode SC, SSCL-type connectors. The fiber port can be set as full or
half-duplex mode by a manual switch selection. No Media Converter needed.
Model P80C with all RJ-45 (copper) ports
RJ-45 ports provide twisted pair segment connections, with N-way auto-
negotiation to all the ports. All RJ-45 ports are capable of half- or full-duplex.
Top-mounted LEDs for convenient viewing
The LEDs that indicate operating status are on the top of the unit for easy viewing
in any situation. For the difficult near-the-floor mounting locations that are
convenient for keeping the cables out of the way, the LEDs are still easily
viewed.