VTEL HS 2000, Руководство системного администратора

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Chapter 4. Monitoring System Operation HS 2000 System Administrator’s Handbook
92 H.221/HDLC
Sync State
Indicates the current state of the receive synchronization module for each
active port. The H.221 standard requires that a number of frame
alignment signals must be successfully received before the connection
can be considered synchronized. This counter reflects the various states
involved in this process. Sync State values are:
Sync Count
The number of times the receive synchronization modules had to perturb
the clock to optimize the frame alignment signal. Normally this field
indicates a value of 0 or 1. It may indicate some other small number;
the value should not change once the Sync State has reached 5.
Sync State Description
Idle A connection is not being processed.
None A connection has been made but the first frame
alignment signal has not been detected.
FAW 1 The frame alignment word (FAW) has been
detected once.
FAW 2 The FAW has been detected twice.
Sync The FAW has been detected three times.
The connection is considered frame-aligned.
MFA has been
established The multiframe number and active bits have been
detected. This is the expected state once a
connection has been established.