CNI and PCI Serial Interface

In some sections of Clipsal Documentation they state that serial interface command buffer is limited to a maximum of 21 bytes (42 charcaters) and in other sections the manual says that the "SAL Data" part of the command stream is limited to (14 - 21 bytes) - depending on network bridges.

Can anyone clear up some confusions on this matter

1. Does the 21 byte maximum include the "\" and the "header byte" at the start and finally the "checksum" byte at the end of the command string?
For example "\05..............CS"

2. If the maximum number of bridges are used, then 8 bytes are required (for additional bridge addressing) so if they state that the SAL Data portion needs to be limited to 14 bytes then something doesn't seem right if slash, header and Checksum bytes are included ?

3. Also does this 21 btye buffer limit place any restrictions on the length of data that the Serial Interface can recieve and relay on to third party devices -- for example is the serial interface reception responses limited to 21 bytes also? - ie can they recieve longer data lengths in response to say SAL or CAL commands?

4. Also can anyone confirm that the CNI moudule behaves exactly the same as the PC Serial interface module (expect for access via telnet) - in other words does the CNI accept exactly the same commands and behave exactly as the Serial interface once a TCIP connection has been established?

many thanks
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See here