Mitel 5760 VC User's Guide download pdf (Page 86)

Chapter 6 Video over IP

6-2 Mitel Networks 5760 VC User’s Guide

Packet Based

In a packet-based network, multimedia streams are broken into packets, sent over

the network through various routes, and reassembled into streams when they reach

their destination. Packet-based bandwidth is dynamic—it depends on how busy and

capable the network routes are at the time of the call.

IP (Internet Protocol) is a set of rules (a protocol) governing how packets are sent

and received over a packet-based network.

Packet-based networking greatly differs from circuit-switched networking (used for

ISDN lines), which opens a dedicated route by turning on switches along the way

to make a permanent circuit between the caller and the party being called for the

duration of the call. ISDN bandwidth is fixed—other calls are not allowed to use

the same circuits until the call has ended.

Although ISDN networking offers a fixed bandwidth, and therefore a Quality of

Service unavailable to IP, there are certain advantages to packet-based networking:

q Packet-based networks use the existing network and infrastructure. This

means lower costs for setup and maintenance. ISDN lines are expensive to

buy, install, manage and service.

q While packet-based endpoints connect to the existing network at the

office, ISDN-based endpoints require separate installations for each.

q Only IP can integrate interactive and streaming video into a single

solution, such as VCON’s Interactive Multicast.

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 161 162

No comments

Mitel 5760 VC User's Guide Page 86