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The Video QAM replication feature allows video carriers to be replicated to support service group alignment between DOCSIS and Video service groups.
Contents
The QAM replication feature allows duplication of content on multiple QAM carriers. This feature is internal to the cBR-8 and replaces the need for external splitters, allowing content to be replicated across multiple ports on a line card.
Multiple Ports: Multiple ports in a Service Distribution Group (SDG) replicate all QAMs from the Virtual Carrier Group (VCG) to output port listed in the same SDG.
Unicast: Unicast (Video on Demand) services cannot be replicated across line cards.
Video on Demand (VoD) or unicast services cannot be replicated across line cards. You can accomplish replication by adding more than one RF port to an SDG. This feature works for the SDG regardless of whether the video sessions are table-based or session-based.
Replication also applies to the QAM PHY parameters. Hence, the QAM PHY parameters like frequency, annex, and symbol rate of the replicated QAM carrier are the same as the QAM PHY parameters on the pilot QAM carrier.
QAM replication is achieved in two ways: software and hardware. The line card performs the hardware QAM replication. Each line card has the capability to replicate an output QAM (Pilot QAM) from one port to another output QAM (Replicate QAM) on another port.
 Note |
QAM replication in the same port is not supported. |
The service-distribution-group construct is used to perform replication. Hardware replication is supported when the replication of individual QAM Carriers is limited to the same line card.
The bind-vcg construct, which is used to determine the physical QAMs to be replicated, is analogous to combiner and splitter combination. The RF ports combine all the QAMs routed to them. Then, one or more inputs are split to one or more RF output ports.
QAM replication reduces the need for external HFC components like splitters and combiners in the RF plant.
The figure below illustrates the bind operation that replaces a combiner and a splitter and performs replication on multiple ports that are assigned to an SDG.
The controller type for the slot/bay/port used for the SDG should be set as 'VIDEO'. The errors corresponding to the incorrect controller type used in the SDG appear during the bind operation.
Perform the following steps to set the controller type:
configure terminal
controller Integrated-Cable slot/bay/port
rf-channel start-channel – end-channel
type VIDEO
start-frequency frequency
rf-output normal
power-adjust number
qam-profile qam-profile number Replication is configured within the SDG by adding a set of RF ports to the same SDG. To configure replication you must choose the Pilot QAM carriers, a set of QAM carriers belonging to a RF port. The Pilot QAM carriers are denoted by the first RF port added under SDG. The rest of RF ports, which carry the replicated content, are specified within this SDG.
Choose the QAM carriers, which carry the content to be replicated, by configuring Virtual Carrier Group (VCG) and specifying the number of QAM channels that are replicated in each RF port. When the pilot QAM carrier is removed, one of the remaining replicated QAM carriers is automatically chosen as pilot QAM carrier.
To configure the replication, complete the following procedure:
configure terminal
cable video
service-distribution-group service distribution group name
rf-port integrated-cable slot/bay/port
rf-port integrated-cable slot/bay/port
virtual-carrier-group vcg_replication id number
virtual-edge-input-ip ip-address vrf vrf-name input-port-number number
rf-channel n-m tsid n-m output-port-number n-m
bind-vcg
vcg vcg_replication sdg sdg_replication To verify the replication information including the replication group ID, pilot or replicant, and the associated status, use the show cable card slot/bayqam-repl group command as shown in the example below:
Router#show cable card 7/0 qam-repl group
-----------------------------------------------------------------
Grp Slot Chan QAM Grp Chan
ID Grp cnt type State List
ID [port:chan state role]
U:Up P:Pilot
D:Down R:Replicant
-----------------------------------------------------------------
57344 0 4 VID U 0:21 UP 1:21 UR 2:21 UR 3:21 UR
57345 1 4 VID U 0:22 UP 1:22 UR 2:22 UR 3:22 UR
57346 2 4 VID U 0:23 UP 1:23 UR 2:23 UR 3:23 UR
57347 3 4 VID U 0:24 UP 1:24 UR 2:24 UR 3:24 UR
57348 4 4 VID U 0:25 UP 1:25 UR 2:25 UR 3:25 UR
57349 5 4 VID U 0:26 UP 1:26 UR 2:26 UR 3:26 UR
57350 6 4 VID U 0:27 UP 1:27 UR 2:27 UR 3:27 UR
57351 7 4 VID U 0:28 UP 1:28 UR 2:28 UR 3:28 UR
57352 8 4 VID U 0:29 UP 1:29 UR 2:29 UR 3:29 UR
57353 9 4 VID U 0:30 UP 1:30 UR 2:30 UR 3:30 UR
57354 10 4 VID U 0:31 UP 1:31 UR 2:31 UR 3:31 UR
-----------------------------------------------------------------
Total number of Replication groups on slot 7/0: 11
To verify the sessions on the pilot QAM carrier, use the show cable video session logical-edge-device id number command as shown in the example below:
Router#show cable video session logical-edge-device id 1
Total Sessions = 22
Session Output Streaming Session Destination UDP Output Input Output Input Output Encrypt Encrypt Session
Id Port Type Type Port Program State State Bitrate Bitrate Type Status Name
------------------------------------------------------------------------------------------------------------------------------------------------------
1048598 21 Remap UDP 172.16.0.1 49152 32 ACTIVE-PSI ON 1104548 1088424 CLEAR - bago_tbv.1.21.49152
1048599 21 Remap UDP 172.16.0.1 49153 33 ACTIVE-PSI ON 1104482 1088424 CLEAR - bago_tbv.1.21.49153
1048600 22 Remap UDP 172.16.0.1 49154 34 ACTIVE-PSI ON 1104922 1090656 CLEAR - bago_tbv.1.22.49154
1048601 22 Remap UDP 172.16.0.1 49155 35 ACTIVE-PSI ON 1105033 1090534 CLEAR - bago_tbv.1.22.49155
1048602 23 Remap UDP 172.16.0.1 49156 36 ACTIVE-PSI ON 1114332 1092488 CLEAR - bago_tbv.1.23.49156
1048603 23 Remap UDP 172.16.0.1 49157 37 ACTIVE-PSI ON 1104353 1092488 CLEAR -
The following example configures replication across four RF ports on line card 7/0:
configure terminal
cable video
service-distribution-group sdg replication id 1
rf-port integrated-cable 7/0/0
rf-port integrated-cable 7/0/1
rf-port integrated-cable 7/0/2
rf-port integrated-cable 7/0/3
virtual-carrier-group vcg_replication id 1
virtual-edge-input-ip 172.31.1.1 vrf vrf-name input-port-number 1
rf-channel 21-31 tsid 21-31 output-port-number 21-31
bind-vcg
vcg vcg_replication sdg sdg_replication
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Note |
The following table lists the software release in which a given feature is introduced. Unless noted otherwise, subsequent releases of that software release train also support that feature. |
|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
Replication |
Cisco IOS XE Everest 16.6.1 |
This feature was integrated on the Cisco cBR Series Converged Broadband Routers. |
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