CMX228
ISDN Protocol Engine
with D - channel Data
D/228/1 October 1999
Advance Information
Features
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Applications
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Full ISDN Voice and Data Services
V.120 / PPP Operation
Hayes Compatible 'AT' Command Set
Supports CTR3 Approval
User Data and X.25 via B and D-
channels
Full API Available
Feature Phones with Data Interfaces
Pay-Phones and H.320 Video Phones
EPOS Terminals
Remote Metering and Alarm Systems
Data Terminal Adapters
Reference Designs Available
1.1
Brief Description
The CMX228 is an ISDN data and telephony protocol engine which implements the lower level ISDN interface
and communicates with the CMX605 and other standard devices to form a fully integrated ISDN chipset for
both voice and data communications. It puts all the main data processing elements in one device, no ISDN
software has to be written and simple ‘Plug and Play’ design results. The CMX228 supports one voice port,
which can be used to provide ISDN telephony services or a POTS line interface, and one data channel,
capable of operation at 115,200 b/s. It also has a full set of ‘Hayes’ compatible AT command codes on its
asynchronous data interface and keypad-configurable voice telephony services.
The CMX228 is designed to work with the AMD 79C30 S/T bus interface, the Siemens PSB-21525 HDLC
formatter and the CML CMX605 POTS interface circuit, and also comes complete with embedded applications
software. In addition, the CMX228 offers data transfer (up to 16kb/s) over the D-channel by using the X.25
protocol. To support the CMX228, CML can also provide licensed reference designs on user request. A
flexible Applications Program Interface (API) allows users to customise the features and operation of their own
design. The CMX228 comes in a compact 80-pin surface mount package.
©
1999
Consumer Microcircuits Limited
©
1999
Chiron Technology Limited
CMLMICRO [ CML MICROCIRCUITS ]
