Platform Notes: SunFDDI Adapter

PCM (Physical Connection Management)

PCM shows the current state of the Physical Connection Management state machine that controls the following features and facilities:

Connection initialization
Maintenance support

This heading is modified to indicate the type of port that is being managed:

PCMS: single-attached station, S-port
PCMA: dual-attached station, A-port
PCMB: dual-attached station, B-port

TABLE 2-3 lists the states that may be returned by pf_stat under the PCM heading.

Table 2-3 pf_stat States Under the PCM Heading


State	Meaning
`OFF`	PCM is inactive (initial state).
`BREAK`	PCM is starting the connection synchronization phase.
CONNECT	PCM is synchronizing the connection end-points prior to the signaling sequence.
NEXT	PCM is transmitting PDUs prior to entering `SIGNAL` state.
SIGNAL	PCM is transmitting and receiving signal bits (information) following a `NEXT` state.
JOIN	First state in the sequence leading to a synchronized connection.
VERIFY	Second state in the sequence leading to a synchronized connection.
ACTIVE	Final state indicating that the port is successfully incorporated in the token path.
TRACE	`PCM` is localizing a stuck beacon condition.

The normal sequence of PCM states leading to a fully synchronized connection and incorporation of the port into the token path is shown in Figure 2-1. Note that the minimum interval between interrogations is one second and that this is not always fast enough to recover and display the complete sequence of PCM states.

Figure 2-1 Normal Sequence of `PCM` States

PCM (Physical Connection Management)

Figure 2-1 Normal Sequence of PCM States

Figure 2-1 Normal Sequence of `PCM` States