Advantech MIC-3369C Guia de Instalação descarregar pdf (Página 55)

Dialogic

System Release 6.1 CompactPCI for Windows

Release Update 55

1.15 IP Multicast Client Support

IP Multicast client, which was supported in previous system releases, is now supported in

Dialogic

System Release 6.1 CompactPCI for Windows

on Dialogic

DM/IP Boards.

IP Multicast is a one-to-many protocol that provides a scalable solution that efficiently

uses network resources and bandwidth. Unlike IP Unicast, which requires X copies of

data to be transmitted from a source to each of X number of receivers, IP Multicast allows

a source to transmit only a single copy of the data being sent to multiple receivers.

Routers throughout the network intelligently forward the data only to those IP endpoints

that have requested it.

To enable IP Multicast client when starting a session, set the ipm_StartMedia( ) function

eDirection parameter to DATA_MULTICAST_CLIENT.

Note: Alternatively, you can set the ipm_SetRemoteMediaInfo( ) function eDirection

parameter to DATA_MULTICAST_CLIENT to enable IP Multicast client. However,

ipm_SetRemoteMediaInfo( ) is deprecated and is included in the library for backwards

compatibility only. Application developers should use the ipm_StartMedia( ) function

instead of ipm_SetRemoteMediaInfo( ).

Note: The ipm_ModifyMedia( ) function does not support the DATA_MULTICAST_CLIENT or

DATA_MULTICAST_SERVER direction mode. The session eDirection setting cannot be

modified once it is set.

The following limitations apply when implementing IP Multicast client:

• For dual span DM/IP Boards, the maximum supported number of simultaneous IP

media channels configured for Multicast client is limited to a TDM line (24 for T1 and

30 for E1).

• IP Multicast loopback (i.e., Multicast server and Multicast client channels on the same

DM/IP Board and configured for the same Multicast group) is not supported.

For more information about the Dialogic

IP Media Library API, see the following

documents:

• Dialogic

IP Media Library API Programming Guide

• Dialogic

IP Media Library API Library Reference

Code Example

The following code example shows how to start a Multicast client session. There is a

subtle difference in the way the API is used when starting a Multicast client session vs.

starting other types of IP sessions. When starting a Multicast client session, the IP

address and coder settings of the Multicast group are specified as the local RTP port and

local coder respectively. (When starting a Multicast server session, the IP address and

coder settings of the Multicast group are specified as the remote RTP port and remote

coder.)

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