User's Manual

W-CMTS

upstream inputs

Hub Rcv/Ant #1

Hub Rcv/Ant #2

Hub Rcv/Ant #3

Hub Rcv/Ant #4

Freq X

Freq Y

Figure 4-5: Four Hub Transceivers as input to W-CMTS.

4.3.3 Available Frequencies

All wireless modems in the same Hub sector must transmit upstream on the same frequency,

and each wireless modem can operate on only one upstream channel.

There are 3 upstream frequencies. The Upstream data rate is 5.12 Mbps with Channel

Bandwidth of 3.2 MHz. See Table 4-2.

The receiver within each Hub Transceiver is factory-tuned to its Receive Carrier Frequency and

Receive Output Frequency to the W-CMTS. Hence the frequency planning must be done prior

to ordering equipment and the frequency must be specified in the purchase order.

The W-CMTS commands the wireless modem to its Upstream Transmit Carrier frequency

during the wireless modem registration process. These are configuration parameters that are

set in the W-CMTS network management system. See the software installation guide for that

product.

June 2003 Page 4-7