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computers, and to provide added utility for its large family |
of users. |
As the name implies, B Plus is an extension of the B |
Protocol. In particular: |
o Ability to send multiple packets without waiting for |
individual acknowledgements. |
o Larger data packets (up to 1k at present). |
o Optional use of modified XMODEM CRC-16 check method. |
o Extensions to the standard control character |
quoting. |
o Provision of a mechanism to exchange transport and |
application parameters. |
2 |
B. Notation. |
Throughout the remainder of this document the following |
notational conventions will be used: |
o Protocol elements are enclosed within angle |
brackets. For example: |
<DLE> |
specifies the ASCII code for Data Link Escape. |
o The C-language notation for hexadecimal values will |
be used. Thus, the <DLE> character will also be |
shown as 0x10. |
Two entities (computers) are involved in a B Plus session. |
The term "Initiator" is used to refer to the entity which |
initiates the session. "Responder" refers to the entity |
which receives the initiate command. |
CompuServe host computers will always be the Initiator in |
any communication established with them. |
For further information regarding Host support, see Section |
"K. Initiation of a B Plus Session." |
3 |
C. B Plus Packets. |
1. B Plus Packet Structure. |
B Plus Protocol packets consist of five parts as follows: |
o Lead-in <DLE> <B> |
o Sequence <0x30 thru 0x39> |
o Type <Single byte> |
o Body <zero to 1024 data bytes> |
o Trailer <ETX> <Check Value> |
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