Chapter 24: IP Video
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 759
Video Encoding Attribute Mask/ Service Flow Attributes
The use of attribute masks in the assignment of service flows to downstream bonding groups and channels is described in
Channel Assignment (page 685). When viewed in a slightly different manner, an individual downstream channel’s attribute
mask can provide a hint of the types of service flows which will use the channel. This aspect of attribute masks is leveraged
to allow the C4/c CMTS to selectively collect extra IP Video statistics only on the channels that are to carry IP Video
services. However, the bit-level encoding of an attribute mask is not specified by the DOCSIS 3.0 standard and is left to be
defined by the MSO user. Because of this, the C4/c CMTS must be told which bit or bits in an attribute mask indicate an IP
video capability. The MSO user communicates the IP Video bit encoding(s) by setting the bit(s) in the video encoding
attribute mask. The C4/c CMTS will compare the bits set in the video encoding attribute mask against the bits set in each
individual downstream channel’s attribute mask to determine upon which channels to collect IP Video statistics.
Note that the attribute mask in downstream bonding groups is NOT used for this purpose.
The video encoding attribute mask is used for monitoring and management. The characteristics include:
Bits are set in the video encoding attribute mask. Multiple bits can be used to differentiate types of video (For
example, VOD versus linear can be identified.)
The attribute masks are configured for each downstream channels for which video metrics are to be gathered.
Configure Video Encoding Attribute Mask
To Configure a Video Encoding Attribute Mask
1. To configure the video encoding attribute mask, enter:
configure ip-video attribute-encoding 0x00000002
2. To display the IP Video encoding attribute mask value:
show ip-video global
3. If desired, configure the individual DS channel attributes to segregate HSD (14/0 through 14/3) and Video (14/4
through 14/7) using connector as shown in this example. For HSD:
configure interface cable-downstream 14/0 cable attribute-mask value 0x80000001
configure interface cable-downstream 14/1 cable attribute-mask value 0x80000001
configure interface cable-downstream 14/2 cable attribute-mask value 0x80000001
configure interface cable-downstream 14/3 cable attribute-mask value 0x80000001
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