Technical information

IBM United States Software Announcement
209-272
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11
• Power 520, Power 550, and Power 570 servers: maximum 4 x DTTA adapters in
each of maximum 2 x LPARs, using 7311-D20 drawers for attachment of DTTA
adapters to the systems.
WebSphere VR 6.1 does not support the DTXA adapter, withdrawn in June 2004.
DTEA is still supported on the same system units as WebSphere VR for AIX V4.2.3.
For further information, refer to Software Announcement 206-080, dated April 11,
2006.
Adapter compatibility: DTTA and DTEA can be mixed in system units in any
combination up to a total of three or four adapters, respectively.
Mixing of DTTA and DTEA in the same system unit allows applications to use double
trunk where calls between VoIP and PSTN can be bridged; for example, in IP call
centers. Note that a single DTEA can support 96 channels when configured for T1
(U.S./Japan) and 120 channels for E1 (rest of the world). Like DTTA, each DTEA
adapter provides support for four telephony trunks.
For installations where there is more than one DTTA or DTEA card in the same
system unit, a top connector cable is required to connect all adapters that are used
by WebSphere VR V6.1 in the same system unit. This cable, known as the H.100 bus
cable, is available in two lengths, one with four drops and another with eight drops.
For all but the largest configurations that also use fax adapters, or if adapters are
installed in adjacent slots, the four-drop cable will usually be suitable. This cable can
be ordered using one of the following options:
• At the same time as the system unit is ordered with the appropriate feature
number. For example, p5-520 - feature number 2877 H.100, four-drop cable, or
p5-550 - feature number 4353 H.100, eight-drop cable.
• As an MES on an existing system unit using the same feature numbers.
• Directly from a telephony cable supplier.
Support for BladeCenter POWER-based blades and Power Systems servers
without an adapter for VoIP connection
Power Systems servers and BladeCenter POWER-based blade servers for use with
VoIP and WebSphere VR V6.1 require, for each WebSphere VR V6.1 instance:
• A minimum of two processor cores
• A dedicated physical Ethernet interface
• A base of 1 GB of RAM
• An additional 10 MB of RAM per channel
Any system meeting the above requirement is suitable for VoIP. Moderate to large
systems utilizing assistive technologies and Java or VXML applications may require
additional RAM, and more or faster processors.
Capacity planning for adapterless configurations has to account for the processing
otherwise done by the DTTA adapter. A development system with fewer than 30
channels may be supported by a single processor. A POWER6 processor-based
system with 2 x 4.2 GHz processors can easily support 480 channels of a simple
state table application. Additional factors in SIP capacity planning are for the use of
DTMF detection and voice compression, both of which may reduce call capacity.
• DTMF detection: The system unit's processors are used for DTMF detection. This
cost can be avoided if the VoIP network supplies DTMF send/receive keys using
RTP payload packets: RFC2833 (Telephone Event).
• Compression: WebSphere VR can store voice data in its database using 5:1
compression. Voice is sent uncompressed (G711) over the VoIP network;
therefore, the system unit's processors need to carry out the required
compression and decompression on record and playback, respectively. For more
information, contact your IBM representative.