| Publisher | Cisco Systems | ||
|---|---|---|---|
| Format | 114.0KB PDF | Date added | 01 Jan 2003 |
| Topics | Modems | ||
| Downloads | 93 | ||
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.
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