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A.W. Communication Systems Limited

TRip2 Manual, Version 1.5 Page 8 of 34 © AWCSL 2010

Each unit can also be configured with main and backup remote unit details.

The master unit can be switched between remote units using one of the logic input pins as a control,

or via the command-line interface for more permanent selection.

A master or slave unit can only receive IP data from one IP address (unit) at a time. All other IP data

sources will be ignored, except for ICMP ping and SSH/TELNET traffic. The accepted source IP

address can be either the main or backup remote unit IP address, and this choice is based on the

current setting provided in the command-line parameter or, from the logic control port pin if this

option is enabled.

4.4. Interface Descriptions

4.4.1. Audio Interface

Functional

Supported Compression Algorithms

The audio interface provided by the TRip2 takes a single analogue receive audio path with a

bandwidth between 300 Hz and 3400 Hz and compresses it using its internal codecs. The following

audio codecs are supported:

Codec

Network Data Rate

RTP Payload Type

G.711 A-law (default)

64 kbps

G.726

40 kbps

G.726

32 kbps

G.726

20 kbps

G.726

16 kbps

Speex

8 kbps

100

Table 1: Supported Audio Codecs

Note: The network data rates shown above are for the audio payload only, and does not include

IP/UDP/RTP packet overhead - see section 7 “Audio Codec Bandwidth” for network bandwidths

required in practice.

Unlike the original TRip, the codecs and data rates do not need to be the same in both directions:

The TRip2 will encode audio data with the settings it is configured with, but will decode the data it

receives based on the RTP payload type in the RTP packets it receives.

Sampling Period

The sampling period can be set to between 5 and 30 ms for any of the codecs listed in Table 1:

Supported Audio Codecs apart from Speex, which ignores this setting as it uses 30 ms packets only.

IP Protocol Support

The compressed audio data is encapsulated and transmitted over an IP network using RTP version 2,

as described in RFC3550 (see section 1 above). The RTP data will be carried using UDP over IP.

Each unit maintains both a local and a remote alarm status for both RTP and RTCP streams. If a local

alarm is triggered, the red alarm LED on the unit will be turned on, which will automatically be

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