Table of Contents
Advertisement
show interface cable mac-scheduler
Table 3-53
overhead) for an upstream that is using a specific channel width and modulation scheme combination:
Table 3-53 Maximum Potential Upstream Bandwidth
Channel Width (MHz)
1.6
1.6
3.2
3.2
6.4
6.4
For example, if the upstream is configured for a 3.2 MHz channel width and is using 16-QAM
modulation, its maximum usable bandwidth is 8.9 Mbps. If the average channel utilization field shows
that the upstream is at 50 percent, it indicates that cable modems on that upstream are currently using
(0.5 * 8.9 Mbps) or 4.45 Mbps.
In Cisco IOS Release 12.1(12)EC, Release 12.2(8)BC1, and later releases, you can add a timestamp to
Tip
show commands using the exec prompt timestamp command in line configuration mode.
Related Commands
Command
show interface cable
show interface cable
sid
show interface cable
signal-quality
show interface cable
upstream
Cisco Broadband Cable Command Reference Guide
3-218
shows the maximum usuable bandwidth (total bandwidth minus header and MAC-layer
Modulation
Scheme
QPSK
16-QAM
16-QAM
64-QAM
16-QAM
64-QAM
Description
Displays configuration and status information for the cable interface.
Displays information by service identifier (SID) of each CM on the network.
Displays information about the cable signal quality.
Displays information about one or all upstreams on the cable interface.
Chapter 3
Raw Speed (Mbps)
Usable Bandwidth (Mbps)
2.56
2.2
5.12
4.4
10.24
8.9
15.36
13.5
20.48
18
30.72
27.2
Cisco CMTS Show Commands
OL-1581-08
Advertisement
Table of Contents
