Telephony hardware

Using DTEA or DTNA: This section addresses only DTTAs. If you plan to use a DTEA card or the DTNA software simulation of a DTEA card for a voice over IP configuration, refer to the Blueworx Voice Response for AIX: Voice over IP using Session Initiation Protocol information for details about how to set up your system.

To process voice data supplied by a telephony connection on an pSeries computer using Blueworx Voice Response for AIX, you need three functions:

All three of the above functions are provided by a DTTA card installed in the pSeries computer.

Digital trunk adapters

The DTTA adapters manage the digital signals coming from the switch to the pSeries computer on up to four trunk lines.

The number of DTTA cards you can install depends on the specific pSeries computer you are using, as defined in the list below:
Table 1. Digital trunk adapters supported by System p5, pSeries and RS/6000 models used with Blueworx Voice Response
System p5, pSeries, or RS/6000 model Maximum number of DTTAs
pSeries 615 Models 7029-6C3 and 6E3 Three
pSeries 620 Models 7025-6F0 and 6F1 Not supported
pSeries 630 Models 7028-6C4 and 6E4 Four
pSeries 650 Model 7038-6M2 Four
System p5-520 Model 9111-520 Three
System p5-550 Model 9113-550 Four
System p5-570 Model 9115-570 Not supported, but see pSeries 7311-D20 I/O Drawer below
System p6-520 Model 8203-E4A Two
System p6-550 Model 8204-E8A Two
System p6-570 Model 9117-MMA Not supported, but see next row
pSeries 7311-D20 I/O Drawer on System p6-520, p6-550, p6-570 Four per i/o drawer
pSeries 7311-D20 I/O Drawer on System p5-520, p5-550 or p5-570 Four per i/o drawer
pSeries 7311-D20 I/O Drawer on pSeries 650-6M2 Four per i/o drawer
pSeries 7311-D20 I/O Drawer on pSeries 630-6C4 Four per i/o drawer
pSeries 7311-D10 I/O Drawer on pSeries 650-6M2 Three per i/o drawer
Intellistation 9114 Model 275 One

The number of adapters you require

Basic Blueworx Voice Response for AIX includes 12 ports on one E1 or T1 trunk, but you can order additional channels (see Channel increments for details).

Table 2 below identifies the number of DTTA adapters you require for specified numbers of channels. It also identifies the number of DTTA licenses needed.

Table 2. Adapter and pack requirements .

This table shows the number of DTTA adapters required to support a given number of T1 or E1 channels. The number of T1 channels is listed before the number of E1 channels, followed by the number of DTTA adapters required.


DTTAs Required







































Configuring DTTA cards

If you install more than one DTTA adapter in your pSeries computer system unit, you need an H.100 bus cable to connect them together to facilitate the transfer of digital data and clock signals between the cards.

It is important that DTTA adapters are installed in PCI slots in such a way as to minimize any bus traffic contention between them and any other PCI adapters, or other devices that use the buses. If the adapters have not been preinstalled, please contact your IBM representative for advice. Up-to-date guidance about the placement and configuration of adapters in specific models of pSeries computer can also be found on the support pages of the Blueworx Voice Response website at

H.100 connections

The DTTA are H.100 adapters. All H.100 adapters in a pSeries computer must be connected together using an H.100 top-connector cable. This is to synchronize the adapters and to support functions such as voice recognition and channel-to-channel connection (tromboning). H.100 is the industry standard for PCI systems.

Blueworx Voice Response supports the H.100 top-connector buses for DTTA.

To make connection easier, H.100 adapters should be installed in adjacent slots in the pSeries computer system unit.

A 4-way H.100 cable is available as Blueworx Voice Response feature code 2877 (FC2877) with the DTTA. Normally a system configuration which includes more than one DTTA adapter will automatically include one FC2877 H.100 cable. The 4-way cable 2877 allows up to four H.100 (DTTA) adapters to be connected together.

Telecommunications cables for DTTAs

To connect each DTTA to the telephone network, you need to use RJ45 (for E1) or RJ48 (for T1) connectors, which plug into the rear connector of the adapter. Each DTTA can then be connected to up to four telephony trunks.

Note: RJ45 or RJ48 cables are not supplied with the DTTA. You must order the cables you require separately.

Synchronization of trunk clocks

Blueworx Voice Response DTTA trunk interfaces are designed to operate in a clock-slave mode where Blueworx Voice Response attempts to recover the clock from the received signal and synchronizes its transmit clock to this recovered received clock. If the network or PBX is not configured as a clock master, incorrect operation and clock instability might occur.

Blueworx Voice Response can handle unsynchronized trunk clocks, but it adjusts the internal clock to normalize all clocks to the internal TDM bus. This action is probably not noticeable on voice, but it might cause excessive data errors if trunks are being used for other types of data, such as fax. For this reason, it is better that all trunk clocks be synchronized (this normally occurs automatically with direct network connections, but channel banks may require some special attention).