Video services are supported on:
MS-ISA
MS-ISA2
MS-ISM (two MS-ISA2 on a single line card)
ESA
These MS-ISA and ESA variants are referred to as ISAs in this section.
Both MS-ISA and MS-ISA2 support FCC/RET, VQM, and perfect stream functionality. The ESA supports only FCC/RET.
When configured in the router, ISAs are logically grouped into video groups for video services. A video group allows multiple ISAs/ESAs for an application. The system performs load balancing between the ISAs. Mixing ISA, ISA2, and ESA in the same video group is not recommended. All ISAs within a video group are always active, there are no standby ISAs.
Video groups provide a redundancy mechanism to guard against hardware failure within a group where the system automatically re-balances tasks to the group excluding the failed MS-ISA or ESA-VM. Video groups also pool the processing capacity of all the group members and increases the application throughput because of the increased packet processing capability of the group. The buffer usage is typically identical for all members of the video group, so increasing the number of members in a group does not increase the scaling numbers for parameters bounded by available buffering, but there is still the increase in performance gained from the pooled packet processor capacity. A video service must be enabled at the video group level before that service can be used.
A video application may restrict the number of ISAs supported in a video group to a smaller number. Please contact your local Nokia representative for more information about video application specifications.