HP 8920A Programmer's Manual page 518

Chapter 8, Programming The Call Processing Subsystem
CALL BIT Screen Message Field Descriptions
CPA
CMAX-1
END
OHD
Parity
518
Combined paging/access field.
1 binary character required.
CMAX is the number of access channels in the system.
7 binary characters required.
End indication field.
• Set to 1 to indicate the last word of the overhead message train.
• Set to 0 if not the last word.
1 binary characters required.
This field displays the overhead message type.
• A '100' indicates a global action message.
• A '110' indicates that this is the first word of the system overhead parameter message.
• A '111' indicates this is the second word of the system parameter overhead message.
3 binary characters required.
Parity field. The contents of the Parity field cannot be set by the user. The Test Set
calculates the parity bits.