
ISDN Data and Telephony Protocol Engine (no X.25)
CMX218
1999
 Consumer Microcircuits Limited
1999
 Chiron Technology Limited
13
D/218/1
1.5.4
POTS Configuration
1.5.4.1 Configuration and Control via DTMF Keypad
Configuration can be carried out at any time by causing the POTS port to go off-hook and then
immediately entering a configuration sequence of DTMF tones.  The sequence signalled to the
CMX218 will determine the configuration to be performed, as shown in the following table.
Configuration
Sequence
S
02
S
#
Name
Description
Default
Test watchdog
Puts the CMX218 into a permanent
loop, not updating the external
watchdog counter, so after 2s it should
reset.
Inhibits CLI delivery on the analogue
POTS port
Configures modem standard to be used
for CLI delivery.
n/a
S
81
S
#
Disable CLI delivery on
port
Use V23 FSK for CLI
delivery
n/a
S
81
S
1n
#
n = alert mode
0 = FSK follows ring burst as per
ETS 300 659-1 para. 6.1.1
1 = FSK follows dual tone alert as per
ETS300 659-1 para. 6.1.2.a
2 = FSK follows ringing pulse alert as
per ETSI 300 659-1 para. 6.1.2.b
3 = FSK follows line reversal and tone
alert as per ETSI 300 659-1
para. 6.1.2.c and BT SIN227.
Configures modem standard to be used
for CLI delivery.
FSK follows ring burst as per Bellcore
GR-30-CORE and SR-TSV-002476
Clears any saved digits
n = MSN (up to 23 digits)
Disabled
S
81
S
2
#
Use Bell 202 FSK for
CLI delivery
Disabled
S
90
S
#
S
90
S
n
#
Clear MSN
Save Multiple Subscriber
Number (MSN)
Clear country code
Change country code
n/a
Clear
n/a
S
93
S
#
S
93
S
n
#
Country code is set to UK by default
n = country code
0 = UK
1 = Belgium
2 = Rest of Europe
Incoming calls on any channel are
accepted (provided other parameters
are valid eg MSN).
Where n = 1 or 2 for the appropriate
channel.
UK
S
94
S
#
Clear channel mapping
n/a
S
94
S
n
#
Enable channel mapping
No channel
map