As recommended by ITU-T, the BAC class of procedure involves
two combined stations operating in the Asynchronous Balanced Mode
in either two-way alternate or two-way simultaneous (half-duplex
or duplex) point-to-point configuration. Combined stations are characterized
by the ability to send both commands and responses, receive both
commands and responses, and provide for data link error recovery.
The protocol optionally provides the ability to use extended
sequence numbering (modulus 128). Extended sequence numbering is
selected by configuration options. Normal operation uses modulus
8 sequence numbering.
Data Rates |
 |
This protocol can be used at data rates up to 76.8k baud for
8-channel ACC multiplexer cards using the HP-PB standard backplane or128k baud
for 8-channel cards installed in the EISA standard backplane. The HDLC
LAP-B (ABM) Protocol product can also be used at higher rates for
high-speed ACC multiplexer cards, such as the 2-Channel HP-PB, 8-Channel
PCI, and the 4-channel T1/E1 products with 2.048M baud capability.
Unformatted Frame or "Pass-through" Mode |
|
This mode is no longer available with the HDLC/LAP-B product.
The "Level 1" protocol can be used to provide this
functionality. Refer to the Level 1- HDLC Framing Protocol
User's Guide for details.
Printable version
