CMX228S1 MX-COM, Inc., CMX228S1 Datasheet - Page 23

• 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
!B3 (LAPB N2 Retry Count)
!B5 (Active/Passive)
4.6.2.6 Basic Configuration Parameters
!C4 (B1 Channel Mapping)
Enables data calls to be made and accepted on the B1-channel. If !C5 is set to 0 the outgoing call SETUP
message will contain a Channel Identification Information Element set to B1-channel only.
!C5 (B2 Channel Mapping)
Enables data calls to be made and accepted on the B2-channel. If !C4 is set to 0 the outgoing call SETUP
message will contain a Channel Identification Information Element set to B2-channel only.
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 4.3.5).
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, i.e. 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:
!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.
!C8 (ISDN Line Failure Detection enable/disable)
Enables or disables Line Failure Detection. (Refer to Section 4.3.3).
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Range
1 to 255
Value
0 (default)
1
Value
0
4 (default)
Value
0
4 (default)
AT!C6=“nnnn”<CR>
Value
0-63
64 (default)
Value
0
1 (default)
Default
Description
X.25 is Active i.e. initiates link initialization.
X.25 is Passive and waits for the network to initialize the link.
Description
Incoming data calls on the B1-channel are rejected with ‘channel not
acceptable’ as the cause.
Incoming data calls on the B1-channel are accepted provided no other
data call is present.
Description
Incoming data calls on the B2-channel are rejected with ‘channel not
acceptable’ as the cause.
Incoming data calls on the B2-channel are accepted provided no other
data call is present.
Description
Fixed TEI, 0 to 63.
Negotiated TEI.
Description
Line Failure Detection disabled.
Line Failure Detection enabled.
4
if no digits are present within the quotes, the MSN is cleared.
Up to 23 digits may be entered.
Description
Sets the number of times the LAPB protocol will retry
sending before giving up and applying recovery
procedures.
23
2000 Chiron Technology Limited
CMX228 Advance Information
Doc. # 20480216.001
2000 MX-COM, Inc.