NetXpress LX & CM-30R Installation & Operation Manual
4
–
Configuration & Operation
Version 1.1
4-26
GatesAir, Inc.
Intraplex Products
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Submit:
Click this button to apply all bus configuration changes on this page.
4.3.3.4 TDM Bus Mapping Configuration
The CM-30R module contains a switch fabric that allows manual interconnection of internal TDM
busses when you want to initiate multi-unicast streams to more than two destinations. On the
transmit side, the switch fabric allows four unicast destinations to be sourced from a single source. On
the receive side, it allows incoming content to be replicated to the other backplane bus on the same
time slots. When echo modules are installed, the system automatically detects them and performs
internal mapping to allow non-multi-unicast streams to be created.
The
TDM Bus Map Configuration
page shows each available target receive endpoint (TDM1A,
TDM1B, IP1, IP2, IP3, and IP4) displayed as individual columns and lists the source transmit endpoint
(where each target receives its data) for all available channels. Each item is capable of bidirectional
communication, so the names for transmit endpoints are the same as those for receive endpoints. The
name of an endpoint associated with a particular channel in the table describes the source of data for
that channel. To access the page, point to
System Cfg
and click
TDM Bus Mapping
(Figure 4-30 for
E1 mode and 4-31 for T1 mode).
The NetXpress LX system has an automatic default profile that connects each of the internal TDM
busses once from an IP source and connects to two IP destinations twice, allowing default multi-
unicasting to two IP destinations. If one echo module is installed, it is tied to 1A. If both echo modules
are installed, they are tied to both 1A and 1B.
To allow for further multi-unicasting operation, you need to create a user profile to map the
appropriate internal TDM bus time slots to the corresponding IP busses. This user profile is internally
stored and applied each time the system restarts.
Table 4-1 shows the two types of profiles available.
Table 4-1. TDM Bus Map Profiles
Profile
Connections
Application
Default
TDM 1A and TDM 1B
are connected once
from the WAN and
twice toward the
WAN
Use when all of the audio, voice, and data sources are coming from
Intraplex channel modules in the NetXpress LX system, and the
destination for all of the sources is another NetXpress LX system on
the IP network.
User Defined
Created by the user
through the Web
interface.
Use when your application does not match the predefined profile but
instead requires IP multi-unicast streams to more than two
destinations.
If your network does not support multicasting, you can configure the CM-30R system to multi-unicast
up to four destinations/IP addresses. To use multi-unicasting with this system, a
transmit
unicast
stream must be created for every destination you wish to reach. You must also specify busses for each
stream. These source programs can be replicated to four different IP destinations. You also need to
specify a multi-unicast time slot range for the channel module program that is to be multi-unicasted.
Please note that the process of multi-unicasting consumes a significant amount of bandwidth within
the IP network. As previously mentioned, if you require multi-unicasting beyond the system default,
you need to create a user-defined profile with appropriate internal to IP bus mapping. To access and
configure bus mapping, point to
System Cfg
and click
TDM Bus Mapping
(Figures
4-30 and 4-31).
The
TDM Bus Map Profile
drop-down list offers the default profile (
Default TDM Profile
) and the
User Defined Profile
. To create a different bus map configuration, select
User Defined Profile
to
access the
Edit TDM Bus Configuration
page. All streams must be out of service before the TDM bus
map can be altered.
