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BS = Block Size. This specifies the maximum size of |
the <Body> divided by 128. Thus 0x04 represents |
512 bytes and 0x08 is 1024 bytes. The value 0x00 |
implies the default size of 512 bytes. |
CM = Check Method. 0x00 is standard checksum; 0x01 is |
XMODEM CRC-16 initialized to 0xffff. Note that |
CompuServe recommends the use of CRC-16 instead |
of the standard checksum due to its superior error |
detection capability. The default is Standard |
Checksum, 0x00. |
7 |
DQ = Data Quoting Level. This parameter is part of an |
interim version of the B Plus Protocol. It has |
been superceeded by the eight byte Quoting Set in |
Parameters Q1 thru Q8 (below). For historical |
purposes, the Quoting Levels are: |
0x00: 0x00 0x03 0x05 0x10 0x11 0x13 0x15 |
0x01: 0x03 0x05 0x10 0x11 0x13 0x15 |
0x02: 0x03 0x05 0x10 0x11 0x13 0x15 0x91 0x93 |
0x03: 0x00 thru 0x1f and 0x80 thru 0x9f |
If a Parameters packet contains Q1-Q8, the DQ must |
be ignored and the quoting set established from |
Q1-Q8. If Q1-Q8 are absent, the above definitions |
must be used. |
TL = Transport Layer. The Initiator sets the TL |
parameter to 0x01 when it is running an |
application that must run under the Transport |
Layer. If the Responder`s half of the application |
also utilizes the Transport Layer, it must also |
set the TL parameter to 0x01. The default value |
is 0x00. More information is in Section "J. B |
Plus Transport Layer." |
Q1-Q4 = A mask indicating which characters in the range |
0x00 thru 0x1f the entity wants quoted. The |
mapping of bits to characters is: |
Bit: 7 6 5 4 3 2 1 0 |
----- ---- ---- ---- ---- ---- ---- ---- ---- |
Q1: 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 |
Q2: 0x08 0x09 0x0a 0x0b 0x0c 0x0d 0x0e 0x0f |
Q3: 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 |
Q4: 0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f |
CompuServe Hosts currently use: |
0x14 0x00 0xd4 0x00 |
Q5-Q8 Same as Q1-Q4 for the range 0x80 thru 0x9f. |
CompuServe Hosts currently use: |
0x00 0x00 0x00 0x00 |
DR Download Resume. |
0x00 : Download Resume not supported |
0x01 : Supports `Tr' Packet |
0x02 : Supports `Tr' and `Tf' Packets |
8 |
UR Upload Resume. |
0x00 : Upload Resume not supported |
0x01 : Supports `Tu' Packet |
0x02 : Supports `Tu' and `Tf' Packets |
FI File Information. This parameter specifies the |
level of extended file handling supported. |
0x00 = No extended file handling |
0x01 = `TI' (File Information) Packet |
These are the currently defined Transport Layer Parameters. |
CompuServe reserves the right to define additional |
parameters at any time. Programs should be capable of |
accepting any number of parameters. Received parameters |
beyond the known ones must be ignored. If fewer Transport |
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