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P300H P300 Series Modem Installation and Operating Handbook Page 77
IDR 8k ESC: [?]
1=Off 2=Sync 3=Async
Change, Tx/Rx, ESC/Aux/BA, Define (IDR), ESC Menu
Tx Aux Circuit: [?]
1=Off (normal) 2=64K in V1&2 3=32K in V1 4=32K in V2
Change, Tx/Rx, ESC/Aux/BA, Define (IDR), Aux Menu
IDR MODE ESC & AUX PORT DEFINITIONS
6.6.26 Change, Tx/Rx, ESC/Aux/BA, DEFINE (IDR) Menu
When operating in IDR or Custom IDR modes, the Define selection is as follows:
OFF The ESC port is disabled (and all ones is sent in the 8k ESC channel)
SYNC Normal 8k synchronous access is provided on the ESC port.
ASYNC This option is only available of the Async ESC feature is available (standard on
P300-IBS and above). The ESC interface is set to be asynchronous. The exact
Baud rate it can support varies with the async character format set on the Async
ESC menu. Typically with 8 bits per character (or 7 + parity) it will support 4800
Baud, but with 8 bits plus parity, it will operate to 9600 Baud.
The reason for this strange situation is as follows: The async data is carrier
synchronously across the 8k ESC link at 9 sync bits per async character (start
+ 8 data bits, no stop or parity). At 9600 Baud with 8 bits/char there are a
maximum of 960 async characters per second (9600 / 10 [start + 8 bits + stop]).
960 async characters per second requires 9 x 960 sync bits per second to convey,
unfortunately 8.64kbps above the 8kbps channel capacity and so characters will
be lost. At 9600 Baud with 9 bits/char (ie 8 plus parity) there are 872 async
characters per second (9600 / 11 [start + 8 bits + parity + stop]). 872 async
characters per second requires 9 x 872 sync bits per second to convey, 7.85kbps,
and so no characters will be lost over the 8K ESC channel. So when set for [8 bits
No Parity] or [7 bits with Parity] the maximum standard Baud rate is 4800 Baud.
When set for [8 bits with Parity] the maximum standard Baud rate is 9600 Baud.
This is followed by the Aux port definition screen:
The Aux port can provide a 32kbps or 64kbps synchronous data circuit in place of one or both of the Audio
ESC channels:
OFF (NORMAL) The Audio ESC channels operate as normal, the Aux port is disabled.
64K IN V1+V2 Both ESC Audio channels are disabled, and the Aux port operates at 64kbps.
32K IN V1 Audio ESC V2 operates as normal, and the Aux port provides a 32kbps channel
in V1.
32K IN V2 Audio ESC V1 operates as normal, and the Aux port provides a 32kbps channel
in V2.