Cisco - Advanced voiceband modem configuration and

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All rights reserved. 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?

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 80 40 Addressing the Underlying Causes—Circuit Quality • Circuit quality problems? • Reengineer the circuit • This may prove difficult, as it may require pulling new cable, replacing equipment, involving multiple providers, paying for new carrier facilities, etc • To locate the problematic portion of the circuit, experiment with various call paths 210 1081_06F9_c2 © 1999, Cisco Systems, Inc. 81 Addressing the Underlying Causes—Modem Quality • If all modems were of infinite quality, then, controlling for circuit quality, they would always select the optimal modulation/speed • If you hold the peer modem and circuit constant, you can vary the modem to find another of higher quality (for that particular circuit and peer) • If you have quality issues with a modem, you may contact the vendor for improved firmware, etc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. 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.

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