masticol@paul.rutgers.edu (Steve Masticola) (04/23/89)
Does anyone know whether there's a bug in setting the S9 register in the Practical Peripherals PM2400SA modem? It's supposed to set the minimum time the modem has to detect the answering carrier, but changing the setting seems to have no effect. This is important to me because the system I work with answers by emitting a 1200-baud tone for 5 seconds, then switching to 2400.* The modem picks up the 1200-baud tone immediately and drops the speed. Any help is appreciated! Please reply by mail if you have any suggestions or knowledge of this problem. - Steve (masticol@paul.rutgers.edu) * BTW, is this speed switching in the CCITT v2.2 standard?
masticol@paul.rutgers.edu (Steve Masticola) (04/23/89)
Please ignore my previous blatherings about answer tones. (Unless I'm further mistaken, though, the S9 register still doesn't do anything meaningful.) - Steve.
rwp@cup.portal.com (Roger William Preisendefer) (04/23/89)
I think S9 is used to set how long the modem will wait for a carrier once the other phone has picked up. If it does not have to wait that long, it will pick up immediately. Roger Preisendefer
bdb@becker.UUCP (Bruce Becker) (04/24/89)
In article <Apr.23.11.13.55.1989.8840@paul.rutgers.edu> masticol@paul.rutgers.edu (Steve Masticola) writes: |Please ignore my previous blatherings about answer tones. (Unless I'm |further mistaken, though, the S9 register still doesn't do anything |meaningful.) The S9 register is certainly useful! There are a number of Hayes clones which cannot talk to my Telebit without setting this register to a higher value than the default, since they attempt to lock to the "PEP" tones & get confused. The object is to make the calling modem wait longer before deciding it has a valid carrier. "ATS9=12S10=15" or similar seems to do the trick. |- Steve. Cheers, -- __ Bruce Becker Toronto, Ont. w \cc/ Internet: bdb@becker.UUCP, bruce@gpu.utcs.toronto.edu `/v/-e BitNet: BECKER@HUMBER.BITNET _< >_ "A divine sparc turned me from nextrophilia" - NoNuke of the North
bdb@becker.UUCP (Bruce Becker) (04/25/89)
In article <17532@cup.portal.com> rwp@cup.portal.com (Roger William Preisendefer) writes: |I think S9 is used to set how long the modem will wait for a carrier once |the other phone has picked up. If it does not have to wait that long, it |will pick up immediately. | |Roger Preisendefer In Hayes modems and most clones, S9 is the value of 100-millisecond units which the modem waits after detecting a carrier to decide if the carrier is valid. It is often set to a higher value than the default in situations where a Telebit Trailblazer is being accessed which has the "PEP" carrier tones first in the answer sequence, which can confuse some modems. S10 ought to have a value greater than S9 so that a momentary carrier dropout won't break the connection. Cheers, -- __ Bruce Becker Toronto, Ont. w \cc/ Internet: bdb@becker.UUCP, bruce@gpu.utcs.toronto.edu `/v/-e BitNet: BECKER@HUMBER.BITNET _< >_ "A divine sparc turned me from nextrophilia" - NoNuke of the North