User's Manual

March 1, 2002 Page D5

Frequency Planning - Upstream

Available Channels

There are 3 available upstream channels

when channel bandwidth of 3.2 MHz is employed

. See

Table D2. When configuring the system the user must select the upper or lower carrier as well at

the modem transmit frequency. The WMTS commands the modem to its upstream transmit

frequency during the modem registration process. [The frequency of each upstream channel in a

WMTS is set via a parameter of the

regtree.txt

file in the network management system. See the

software installation guide]. All modems utilizing a given upstream channel must transmit on the

same frequency, and each modem can operate on only one upstream channel.

Notes

1. These frequencies are subject to change.

Additional upstream frequencies will be available in 2002.

Contact the factory when upstream channels bandwidths of 400 KHz, 800 KHz or 1.6 MHz are to be

utilized. U.S. FCC-approved systems must employ 3.2 MHz upstream bandwidth.

Table D2 - ARCi Upstream Frequency Plan

Upstream Data Rate 5.12 Mbps; Channel Bandwidth 3.2 MHz

Modem Tx Upper Carrier Up WMTS Rx Lower Carrier Low WMTS Rx

center (MHz) center (MHz) center (MHz) center (MHz) center (MHz)

6.4 5306.4 6.4 5293.6 6.4

9.6 5309.6 9.6 5290.4 9.6

12.8 5312.8 12.8 5287.2 12.8