By Olga Kokoreva
Advisor to utilizing home windows Server registries. how you can plan and enforce a suitable registry backup method, and computer screen and regulate the method registry in keeping with administrative standards and safety coverage. For home windows directors and complex clients. Softcover.
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83 Addressing the Underlying Causes—Excessive Speed • Given that circuits are in fact imperfect, so that they cannot always attain the ideal speed, and given that some modems are imperfect, so that they will not always choose the optimal speed for the imperfect circuit… • The remaining option is to help the modems choose a better (slower) speed for the imperfect circuit 210 1081_06F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 84 42 Detuning Modems • Given a pair of modems and a circuit, they usually can (and sometimes will) select a carrier speed that yields an unstable connection • A nominally higher DCE speed may produce worse performance than a nominally lower one, due to retrains, EC retransmits and lost carrier • If you cap the modems to restrict their range of modulations and/or DCE speeds, they may be able to train up (where they had been unable to do so before), or may achieve more stable connections 210 1081_06F9_c2 © 1999, Cisco Systems, Inc.
Printed in USA. htm#23729 210 1081_06F9_c2 © 1999, Cisco Systems, Inc. txt 210 1081_06F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 68 34 Analyze the Performance Data • Now that you have collected and understood the performance data for your modem system, it’s time to look at any remaining patterns/ components that may have room for improvement 210 1081_06F9_c2 © 1999, Cisco Systems, Inc. 69 Bad Modems/Channels? • Are problems associated with particular NAS modems?
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.