Specifications
CHAPTER
2-1
Cisco TV CDS 2.5 ISA Software Configuration Guide
OL-24788-01
2
Network Design
This chapter describes the different network topologies for the Cisco TV CDS, the different network
connections of the CDS servers, the CDS workflow, and network configuration considerations. The
topics covered in this chapter include:
• Overview, page 2-1
• TV CDS and VVI Topologies, page 2-2
• CDS Workflow, page 2-7
• Vault Virtualization, page 2-12
• BMS Considerations for ISA Environments, page 2-17
• Network Connections, page 2-19
Overview
The TV CDS enables cable operators and multiple service operators (MSOs) to offer VOD and MediaX
services to consumer customers over their existing hybrid fiber coaxial (HFC) network, with existing
next-generation digital STBs. The TV CDS solution uses a gigabit Ethernet (GE) transport network from
the headend to the distribution hub, where the HFC network terminates.
TV CDS grows seamlessly from a single server implementation to multiple servers. As growth
continues, TV CDS allows operators to install distributed servers to address concentrations of
subscribers while leaving content ingest and management centralized.
Stream Groups can be distributed close to the subscriber and linked back to the central Vault locations
by way of the Cisco Cache Control Protocol (CCP). Cisco CCP automatically ensures that any new
content that is required by a customer edge device is transferred within a maximum of a 250-millisecond
delay to the appropriate edge location; as a result, all content appears local to each edge site, even though
most content is stored at the central Vault location.
The TV CDS offers different configurations with regards to network topology, business management
systems (BMSs), and streaming modes.
CDS with Vaults and Streamers
In a TV CDS with Vaults and Streamers, MPEG-2 transport stream (TS) video is stored on the Vaults
with the associated trick-mode files. Content is transported from the Vaults to the Streamers as needed,
by using CCP over gigabit Ethernet networks. Content is sent unicast from the Streamers and delivered