White Papers

Understanding Upstream Modulation Profiles

Overview Modulation profiles define how information will be transmitted upstream, from a cable modem to the cable modem termination system (CMTS). Many upstream modulation profile variables can be changed, such as guard time of the burst, preamble, modulation (quadrature phase shift keying [QPSK] or 16-quadrature amplitude modulation [QAM]), and forward error correction (FEC) protection. Cisco has created three default profiles, qpsk, 16qam, and mix to eliminate confusion, but changes may be necessary depending on the application.

By downloading you agree to our Terms and Conditions. These include information regarding use of your personal data.

Publisher: Cisco Systems
File Format: PDF
Date Published: Nov 28, 2007
Format: White Papers
Topics: Modems

Similiar White Papers

Palm & Treo Hacks: Use Your Treo as a Modem

If one has signed up for the carrier's wireless data plan, one can get the entire Internet on the Treo. It may not seem

Publisher: O'Reilly Media | Tags: data, dsl, laptop, treo

Design and Simulation of Orthogonal Frequency Division Multiplexing (OFDM) Signaling

A MATLAB program has been written to investigate Orthogonal Frequency Division Multiplexing (OFDM) communication systems

Publisher: Bradley University

OFDM Receiver Design

Othogonal Frequency Division Multiplex (OFDM) has gained considerable attention in recent years. It has been adopted for

Publisher: Regents of the University of California | Tags: 802.11a, applications

Intercarrier and Intersymbol Interference Analysis of OFDM Systems on Time-Varying Channels

In intersymbol interference (ISI) and intercarrier interference (ICI) for OFDM systems with insufficient guard length wa

Publisher: University of Hannover

Extended Loops for Distant Phones and Fax Machines, Higher Ringing Voltage and Loop Current

Enterprises are turning to Voice-over-IP (VoIP) and IP telephony solutions for voice communications in corporate and bra

Publisher: Cisco Systems | Tags: applications, ip, network, voip

Cisco Systems White Papers

Understanding Multiple Spanning Tree Protocol (802.1s)

Featured white papers

The Value of Location Intelligence in the Communications Industry

Pitney Bowes

Public Services are under pressure, the challenge is to do more with less. How do you improve citizen satisfaction, increase cost efficiencies and improve service delivery? The power of location intelligence is helping many local authorities...

Download now »
Best Practices for Translating Customer Satisfaction into Revenue

Citrix Online

Today's support organisations are focused on two top-level metrics: financial results and customer satisfaction. For most, it's easy to track financial performance, but customer satisfaction is akin to speaking a foreign language...

Download now »
HP print solutions and 3M

Hewlett-Packard (HP)

The objective for 3M was to optimize office printing infrastructure at 3M locations worldwide, reduce total cost and environmental footprint. Some of the business benefits acheived by switching to HP print solutions...

Download now »