CMX208S1 MX-COM, Inc., CMX208S1 Datasheet - Page 14

• Manufacturer Part Number: CMX208S1
• Description: ISDN dual telephony protocol engine
• Manufacturer: MX-COM, Inc.

ISDN Dual Telephony Protocol Engine
Receipt of a valid DTMF tone will prompt its conversion to IA5 coded digits, as shown in the following table
(IA5 hex digits are in brackets). If the first valid digit to be received is a ‘$’ then the configuration mode is
entered and subsequent digits will be monitored and saved as indicated in Section 4.4.1. If the first tone
received is not a ‘$’ or ‘ ’ (See Section 4.5.1) that digit and all subsequent digits will be passed to the network
in an INFORMATION message as a Called Party Number Information Element. Digits received before the
network has returned the SETUP ACK message are saved. Upon receipt of the SETUP ACK any saved
digits will be transmitted.
The DTMF tone mapping is as shown below:
Once the network has indicated that the full number has been received, no further digits will be sent to the
network. All tones and announcements from the network (e.g. ringing, NU, busy etc) and audio (if the call is
connected) will be routed to the POTS port initiating the call, until that port goes on-hook.
4.5.4
Once a call is connected to an analog port, whether it was incoming or outgoing, a port-specific LED indicator
pin is set high to indicate that the call is connected. See Section 4.7.1 for details of the LED indicator pins.
Once the call is disconnected, either by receipt of a DISCONNECT message from the network or an on-hook
indication, the ports’ LED indicator pin is set low.
During a call, if a Recall (i.e. a line break of appropriate length) is received from a POTS port, the CMX208
will start to look for DTMF tones received on that POTS port. Any tones received will then be sent to the
network in ISDN INFORMATION messages, as Keypad Information Elements .
4.5.5
The call is cleared either by the port going on-hook or by the ISDN network. Note that the ISDN B-channel,
which was being used, is not released until the POTS port, which was in use, has gone on-hook.
4.6
Details of this will be supplied to customers under a Non-Disclosure Agreement.
The following Memory Map indicates the main code areas used on the CMX208:
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
Connected Calls
Call Clearing
Application Programmer's Interface
Low Group
Code Space
External RAM
API area
AMD79C30 ISDN Interface Chip
PSB21525 HDLC Driver Chip
Reserved
(Hz)
697
770
852
941
Function
$(2A)
1 (31)
4 (34)
7 (37)
1209
Start Hex Address
2 (32)
5 (35)
8 (38)
0 (30)
1336
14
High Group (Hz)
0C0 000
0F0 000
0F0 100
0F0 200
000 000
020 000
3 (33)
6 (36)
9 (39)
1477
(23)
End Hex Address
01F FFF
03F FFF
0EF FFF
0FF FFF
0F0 0FF
0F0 1FF
2000 Chiron Technology Limited
CMX208 Advance Information
A (not used)
B (not used)
C (not used)
D (not used)
1633
Doc. # 20480214.001
2000 MX-COM, Inc.