ISDN Data and Telephony Protocol Engine (inc. X.25)
CMX228
Value
0
Description
Incoming data calls on the B2-channel are rejected with ‘channel not
acceptable’ as the cause.
4 (default)
Incoming data calls on the B2-channel are accepted provided no other
data call is present.
Note: If both !C4 and !C5 =0 no data calls will be made or received.
!C6 (MSN Directory Number)
Also refer to ISDN MSN (section 1.5.3.5).
If there is a number saved in this register upon receipt of an incoming data call, the CMX228 will check
for the presence of a Called Party Number Information Element. If present it will compare the number
with that saved in the !C6 register. If they match, the call will be accepted, ie a ‘RING’ indication (RI
pin is raised, then lowered after 3s) is returned to the DTE. If the Called Party Number Information
Element and saved MSN do not match, the call is ignored. The command is entered as follows:
AT!C6=“nnnn”<CR>
if no digits are present within the quotes, the MSN is cleared.
Up to 23 digits may be entered.
!C7 (TEI selection)
Selects the fixed or negotiated TEI used on the ISDN link. Note that the value of !C7 only takes effect
when the ISDN interface goes from de-activated to activated.
Value
Description
0-63
64 (default)
Fixed TEI, 0 to 63.
Negotiated TEI.
!C8 (ISDN Line Failure Detection enable/disable)
Enables or disables Line Failure Detection. (Refer to section 1.5.3.3).
Value
0
1 (default)
Description
Line Failure Detection disabled.
Line Failure Detection enabled.
ã 1999 Consumer Microcircuits Limited
ã 1999 Chiron Technology Limited
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CMLMICRO [ CML MICROCIRCUITS ]
