dias@iris.ucdavis.edu (Gihan Dias) (11/09/90)
Hi, I have been trying to connect with a site in Sri Lanka from the U.S. using 2400 b/s V.22bis modems (Everex 24+) on both sides and am having problems in connecting. The remote modem (in Sri Lanka) answers and I hear carrier but sometimes I don't get a CONNECT message, and sometime I do get a connect message but can't transfer any data (not a single byte). This happened both with MNP4 on and off (MNP5 was always off). The connection appears OK, a bit noisy and with satellite delays and echoes but voice communication is no problem. O.K., the question is: What am I doing wrong? What should I look out for and what parametes of the modem should be set for this type of circuit. A side question: What does the guard tone do? Should I turn it on? Thanks for your help, Gihan
bruce@ccavax.camb.com (11/11/90)
In article <7955@ucdavis.ucdavis.edu>, dias@iris.ucdavis.edu (Gihan Dias) writes: > A side question: What does the guard tone do? Should I turn it > on? If it is what I think it is, it inhibits echo suppressors that you very much do not want in your connection. They are switch gain repeaters that perform an electronic push-to-talk function leaving the signal path in the opposite direction attenuated. Certainly try turning it on. The newer active echo cancelers used on satelite circuits are probably a different issue. They are also what is built into the v.32 modems to allow full use of the bandwith both directions at once.