Activating Upstream Differential Encoding - Cisco 7246VXR - uBR Router Software Configuration Manual

Chapter 3 Configuring Cable Modem Interface Features
Cisco CMTS upstream admission control is turned off by default and must be activated. To set the
upstream admission control as a percentage of the upstream channel capacity, use the following
command in cable interface configuration mode. The admission control is set as a percentage of the
specified upstream channel capacity. The acceptable range is from 10 to 1000 percent.
Router(config-if)# cable upstream usport admission-control percentage
For example:
7246VXR(config-if)#cable upstream 0 admission-control ?
Syntax Description usport
percentage
If percentage is left blank or set to 100%, the CMTS will only allow a total up to the real available
Note
upstream bandwidth to be guaranteed. If percentage is set to its maximum of 1000, then up to 10 times
the real interface bandwidth may be "guaranteed".
Verifying Upstream Admission Control
To determine if upstream admission control is configured and activated, enter the show running-config
command in privileged EXEC mode and look for the cable interface configuration information. If
upstream admission control is configured and enabled, an admission control entry appears in the
show running-config command output, indicating the user-defined percentage of upstream channel
capacity allowable. If upstream admission control is disabled, no admission control entry appears in the
output.
Perform these steps if you are having difficulty with verification:
Ensure that the cable connections are not loose or disconnected.
Step 1
Ensure that the cable interface line card is firmly seated in its chassis slot.
Step 2
Step 3 Ensure that the captive installation screws are tight.
Verify that you have entered the correct slot and port numbers.
Step 4
Verify that you selected a valid frequency for your router.
Step 5

Activating Upstream Differential Encoding

Differential encoding on the upstream is a digital encoding technique whereby a binary value is denoted
by a signal change rather than a particular signal level. To enable differential encoding on upstream
traffic to a specified cable interface, use the following command in cable interface configuration mode.
Upstream differential encoding is enabled by default.
Router(config-if)# cable upstream usport differential-encoding
OL-2239-03
Max Reservation Limit As Percentage of Raw Channel Capacity
The upstream port that has admission control enabled.
The optional percentage parameter specifies the overbooking rate that will be used
when deciding the amount of bandwidth that is available to be guaranteed.
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
Configuring the Upstream Cable Modem Interface
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