Pt2 Card - Aastra AXD Installation And Maintenance Manual

4.13.5

PT2 card

4.13.5.1 Overview
The PT2 card provides both a "TCP/IP – internal buses" gateway function for signalling
and a "voice over IP" gateway function. It is used for connection to an Ethernet 10/
100 Mbits Base TX LAN socket, in compliance with IEEE 802.3 specifications.
It is able to manage 8, 16 or 32 VoIP gateway channels, with the addition of an optional
VoIP daughter card performing speech signal processing tasks.
4.13.5.2 Functional description
The PT2 card mainly provides the following functions:
• Gateway between an Ethernet LAN and the internal buses of the iPBX used to
exchange data between the main card memory and an Ethernet LAN
• Tunnelling function, for iPBX networking, using an IP network as a medium for the
signalling channel
• the Voice over IP (VoIP) gateway function, which uses the VOIP4-8, VOIP4E-16, or
VOIP4E- 32 daughter card to manage 8, 16, or 32 Voice over IP circuits, for:
- speech compression and encoding to the G723.1 or G729A standard or with no
encoding (G711),
- relaying (detection and generation) of fax tones at 2100 Hz and transfer of DTMF
codes, in accordance with RFC 2833 (see Doc. AMT/PDD/TDD/0031/01/02/EN),
- fax modulation and demodulation (rates between 2400 and 14400 bit/s), according
to a priority mechanism, in transparent mode (bypass in G711), and electric echo
cancellation (G.165).
Caution:
• Power supply: the PLT2 card also receives on the backplane connector (J1) the +5 V
supply voltage, used for the operation of its internal circuits.
AMT/PTD/PBX/0058/4/6/EN
Page 238 01/2011
A multi-site link cannot mix a VOIP4E (HotHaus) card in conjunction with a
VOIP2 (Audiocodes) card.
Description des sous-ensembles
Installation and Maintenance Manual - Aastra 5000