US Robotics COURIER Bedienungsanleitung PDF herunterladen (Seite 118)

U.S. Robotics I-modem Command Reference

Handshaking, Error Control, Data Compression, and Throughput • Page 11-9

instance that this may be necessary. (See Appendix A, Alphabetic Com-

mand Summary.)

Dual Standard Handshaking

We recommend that I-modems retain the default B0 and &N0 settings. This allows them

to make analog connections with

ÒV.Ó protocol

and HST modems in both Originate and Answer modes at a variety of

speeds.

When originating an analog call and the I-modem is set to B1, it sends out a Bell answer

tone, which is the prevalent standard in the United States and Canada for connections at

2400 bps and lower. At higher speeds, the I-modem also recognizes the ITU answer tones

necessary for connecting with V. protocol modems, and adjusts to the answering device.

However, when answering a call, an I-modem sending out the Bell answer tone (B1) won't

be recognized by V. protocol modems. The calling modem, instead, will wait until it

detects a tone it recognizes. The V.22bis tone used at 2400 bps.

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US Robotics COURIER Bedienungsanleitung Seite 118