3Com 3C780 User Guide - Page 109

PHY Type, Neighbor, PCM State

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Using the Hub 5-7 PHY Type The PHY (Physical Layer) protocol specifies the rules for encoding data for transmission from one FDDI station to another. Table 5-4 lists and defines the physical port types for the PHY Type line in Figure 5-7. Table 5-4. Physical Layer Port Types Physical Port Type Definition A The port in a dual attachment station or hub that attaches to the Primary In and the Secondary Out when attaching to the dual ring B The port in a dual attachment station or hub that attaches to the Secondary In and the Primary Out when attaching to the dual ring M A port in a hub that serves as a Master to a connected station or hub S A port in a single attachment station or hub designated as a Slave U Unknown port type Neighbor Neighbor displays the port type when PCM (Physical Connection Management) State is Active. When PCM State is no longer Active and you enter the show ports command again, the Neighbor field displays the last reported port type. This is true even if you have physically removed the cable that was previously connected to the port. PCM State The PCM (Physical Connection Management) protocol initializes the connection of neighboring ports and manages the signaling between ports. Table 5-5 lists and defines the Physical Connection Management states for the PCM State line in Figure 5-7.

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5-7
Using the Hub
PHY Type
The PHY (Physical Layer) protocol specifies the rules for encoding data for
transmission from one FDDI station to another.
Table 5-4 lists and defines the
physical port types for the PHY Type line in Figure 5-7.
Table 5-4.
Physical Layer Port Types
Physical Port
Type
Definition
A
The port in a dual attachment station or hub
that attaches to the Primary In and the
Secondary Out when attaching to the dual ring
B
The port in a dual attachment station or hub
that attaches to the Secondary In and the
Primary Out when attaching to the dual ring
M
A port in a hub that serves as a Master to a
connected station or hub
S
A port in a single attachment station or hub
designated as a Slave
U
Unknown port type
Neighbor
Neighbor displays the port type when PCM (Physical Connection Management)
State is Active.
When PCM State is no longer Active and you enter the
show
ports
command again, the Neighbor field displays the last reported port type.
This is true even if you have physically removed the cable that was previously
connected to the port.
PCM State
The PCM (Physical Connection Management) protocol initializes the
connection of neighboring ports and manages the signaling between ports.
Table 5-5 lists and defines the Physical Connection Management states for the
PCM State line in Figure 5-7.