CMX228S1 MX-COM, Inc., CMX228S1 Datasheet - Page 26

• Manufacturer Part Number: CMX228S1
• Description: ISDN data and telephony protocol engine with x.25
• Manufacturer: MX-COM, Inc.

ISDN Data and Telephony Protocol Engine with x.25
5.
5.1
The CMX228 is intended for use as part of an ISDN chipset. The MX-COM recommended hardware
implementation contains the following elements (refer to Figure 3):
S/T
5.2
The firmware and finite state machine embedded in the CMX228 have been used in products that have
gained ETSI CTR3 approval.
MX-COM, Inc
4800 Bethania Station Road, Winston-Salem, NC, 27105-1201, USA
www.mxcom.com tel: [phone] 744 5050 fax: [phone]
All trademarks and service marks are held by their respective companies
12V
‘S’ bus interface via RJ45 socket.
RJ11 analog telephone socket and analog circuitry.
ISDN line transformer.
AMD79C30 S-interface controller.
Single asynchronous RS232 interface via 9-way or 25-way D-type connector.
64K bytes external RAM.
16K Non-volatile memory.
Ten processor controlled LED indicator signals.
HDLC drivers for the 2 ISDN B-channels, both channels can be used for data transfer.
MOTOROLA
TRANSFORMER
MC34063A
MC7805CT
Application Notes
General
Approvals
31909x029
PSU
50V
5V
IOM2
BUS
FIFO & DLC Tx DTMF,RING,TONES
POTS SLIC
DISCRETE
S/T CONTROLLER & PCM CODEC
2X(HDLC & FIFO)
POTS
port
PSB 21525
SIEMENS
AMD AM79C30
Figure 3: Application Block Diagram
PARALLEL BUS
5 x Interface ICs
RING & TONES
26
HY 6281009
TxCLID,SPM
128K RAM
RxDTMF
CMX605
C-BUS
BUS
I C
2
16K EEPROM
4K RAM 128K ROM
PROTOCOL ENGINE
24C16
CMX228
2000 Chiron Technology Limited
MAX 238
RS232 V24/1
CMX228 Advance Information
RS232
port
WATCHDOG
TC 1232CO
Doc. # 20480216.001
2000 MX-COM, Inc.
10 x LEDS
API
port