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LBI-39224
4-20
the System Errors field and is also counted as a single error in each
individual interface module error count.
Status
Indicates whether the current channel is enabled or disabled (HDLC A
and B only). If disabled, no communications are possible on the
channel. This field is not applicable for the MOM Serial HDLC.
Frame
Describes the HDLC protocol frame type, either I, S, or U.
Qd
A count of I, S, or U frames placed in the respective transmit queue.
Tx
A count of I, S, or U frames copied from the respective transmit queue
to the HSCX chip transmit FIFO.
Rx
A count of valid I, S, or U frames received, where a valid frame is
defined as one in which the HSCX chip receive status (RSTA) register
contains the following bit values:
VFR = 1 (valid frame received)
CRC = 1 (CRC check OK)
RAB = 0 (received frame not aborted from transmitting station)
discd
A count of received I, S, or U frames discarded due to the following:
I-frames – N(R) or N(S) error, address byte indicated a response (I-
frames are always commands), or station in a state that doesn't
accept I-frames.
S-frames – N(R) error, unrecognized command/response, or station
in a state that doesn't accept S-frames.
U-frames – unrecognized command/response, address byte
indicated a command for a response, or vice-versa.
Q Ovf
A count of I, S, or U frames lost due to transmit queue full condition.
Errors Tx
A count of all frame types that had to be re-transmitted due to an XMR
(Transmit Message Repeat) interrupt from the HSCX chip.
Errors Rx
A count of invalid frames received, where an invalid frame is defined as
one in which the HSCX chip receive status (RSTA) register contains
one or more of the following bit values: