VTEL HS 2000, Руководство системного администратора

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Chapter 4. Monitoring System Operation HS 2000 System Administrator’s Handbook
90 H.221/HDLC
Port Channel
Indicates whether the connection(s) are structured as B or H0 channels.
These are H.221 designations that describe how the data will be arranged.
The H.221 subsystem looks for the various frame alignment signals based
on this indicator.
Port Status parameters
Port Active
Indicates whether the port is currently being used (on) or not (off).
It is the first flag activated at the initialization of a connection.
Only one port should be active during a single channel connection; both
ports should be active during a dual channel connection.
We are MFA
Indicates whether the port is currently multi-framed aligned at the local
site (on) or not (off).
The H.221 standard requires that a certain number of frame alignment
signals must be successfully received on each end before a connection
is considered established.
This flag is set when the local system has received the prescribed frame
alignment signals from the remote site and reflects the current state of the
A-bit in the frame alignment word currently being transmitted.
They are MFA
Indicates whether the port is currently multi-framed aligned at the remote
site (on) or not (off).
This flag is set when the remote system has received the prescribed frame
alignment signals from the local site and reflects the current state of the
A-bit in the frame alignment word currently being received.