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Scr 78 39 The Underlying Causes There are Three Fundamental Causes of Imperfect Modem Connections, the First Two Causes are Just Corollaries of Each other: • Poor circuit quality (relative to the desired modulation/speed) • Excessive modulation/speed (relative to the circuit quality) 210 1081_06F9_c2 © 1999, Cisco Systems, Inc. ) The Third Underlying Impediment to Perfect Modem Connections is What One Can Call Modem Quality. Quality There are Several Aspects to Modem Quality: • The ability of the modem optimally to resolve the data from the analog signal received • The ability of the modem to select the optimal receive modulation/speed for the given circuit • The ability of the modem to interoperate nicely with the vast and evershifting range of peer modems (of various quality) encountered in the field 210 1081_06F9_c2 © 1999, Cisco Systems, Inc.

Printed in USA. g. 115200 bps), and will use flow control as needed if it can’t keep up. • However, it has been reported that that some Windows systems can prematurely disconnect unless the DTE speed is reduced and/or the async serial buffer sizes are reduced. 210 1081_06F9_c2 © 1999, Cisco Systems, Inc. 0) Microcom: Increase S10 (Lost carrier timer), disable rate renegotiates (:t110=0), increase EQM trip threshold (:t34) © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. 34 may be somewhat degraded 210 1081_06F9_c2 © 1999, Cisco Systems, Inc. 75 Trend: Particular Client Modems Have Particular Problems • So now the great majority of calls connect in the desired modulation with the desired speed • …but there are still a few particular client modems running some particular firmware on some particular POTS lines calling via some particular circuits which are failing to behave as desired… • So you can now adjust to living with imperfection, or else move in for hand-to-hand combat 210 1081_06F9_c2 © 1999, Cisco Systems, Inc.

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Cisco - Advanced voiceband modem configuration and Troubleshooting 210


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