NEC Neax 2400 Imx Message Center Interface Instruction Manual

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CHAPTER 3 MCI FOR LAN
1. SPECIFICATIONS
1.1 Timing
Timing to Establish a Link : A link is connected when an MC connect request is received.
Timing to Output  Call  Information : When a call terminates to the attendant or a UCD group station,
the call information is sent via the MCI to the MC.
Timing to Receive MWL Information : When Message Waiting Lamp (MWL) information is received,
the MWL of the station served by the PBX is caused to be ON/
OFF.
Timing to Release the Link : The MC for Local Area Network (LAN), which is a client of
the PBX, discards the socket and performs processing to re-
lease the link when it does not receive a “Call Information
Text” or “Server Response Text” in a given time interval from
the server. When the PBX or the server does not receive a
“Lamp Control Text”, “Client Response Text”, or “Status Mon-
itoring Text” in a given time interval from the client, it performs
NG processing + sends a “Connection Disconnect Text” and
then discards the socket and performs processing to release the
link.
1.2 Interface
This section has information on the interface requirements for the PBX and the external device (MC for
LAN). Figure 3-1 shows the PBX and the MCI for LAN interface.
Protocol : Stream type socket (TCP) protocol
Physical condition : Ethernet
Software conditions
• PBX : Socket interface (capability provided to deal with WinSock)
• External device : Shall use the WinSock, UNIX socket and other libraries.
Port No. : 60020 (defined at PBX side)
Codes to be used
• Transmission code : ASCII 8 bits without parity
• Control codes
SYN : 16H indicates the beginning of a text.
STX : 02H indicates the beginning of an MCI record.
ETX : 03H indicates the end of an MCI record. 
						

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Figure 3-1   PBX and MCI for LAN Interface
1.3 Basic Configuration of Text
Data is transferred between the server and client in the unit of a text.
A text, as shown in Figure 3-2, consists of SYN (16H), used as the beginning of a text, a text identifier,
data length, device No., sequence No., message and parity (horizontal parity check system).
The result of the exclusive logical sum of the parity range is set as the parity.
(If the result of the exclusive logical sum of the range from the text identifier to the parity is even parity,
the check bit is set to “0”. If it is odd parity, the check bit is set to “1”.)
Figure 3-2   Text Basic Configuration
(1) SYN: Text Data Start Position Information
The SYN defines the position where the text data to be sent or received is to start.
Data type : Hexadecimal
Data size : 1 byte
Data : SYN 16H
Application
Socket
TCP/IP
Ethernet Call information/MWL
information transfer
protocol
PBX
Application
Socket
TCP/IP
Ethernet Call information/MWL
information transfer
protocol External Device (MC for LAN)
Call information/MWL
information protocol
S
Y
N
(X)Text
identifier
(X)Device
No.
(XX)Parity
(X)
Sequence
No.
(XX)Call information or
lamp control
information or
response No., etc. Data length
(XXX)
Parity Range 
						

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MCI FOR LAN
(2) Text Identifier 
The text identifier identifies the data to be sent or received.
Data type : Decimal (ASCII code)
Data size : 1 digit
Data range: 0 to 9
0 : Not used
1 : Lamp Control Text (MC for LAN PBX)
The PBX that received the data sends the result of the received data check as a “Server
Response Text (text identifier (3))” to the MC for LAN in a predetermined time inter-
va l.
2 : Call Information Text (PBX MC for LAN)
The MC for LAN that received the data sends the result of the received data check as
a “Client Response Text (text identifier (4))” to the PBX in a predetermined time in-
terval.
3 : Server Response Text (PBX MC for LAN)
When the PBX receives identifiers (1) or (5), it sends the result of the received data
check to the MC for LAN.
4 : Client Response Text (MC for LAN PBX)
When the MC for LAN receives identifier (2), it sends the result of the received data
check to the PBX.
5 : Status Monitoring Text (MC for LAN PBX)
When both the MC for LAN and PBX do not send any of the various types of process-
ing requests, a status monitoring text is sent by the MC for LANs in a predetermined
time interval.
When the PBX receives the text, it monitors the status of the client.
6 : Link Release Text (MC for LAN PBX)
A link release request text sent from the client to the server and from the server to the
client.
(3) Data Length
The data length indicates the length of data to be sent and received between the server and client.
The number of bytes ranging from the character following the data length to the character preceding to
the parity is set in terms of 3 digits.
Data type : Decimal (ASCII code)
Data size : 3 digits
Data range: 0 to 999 
						

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(4) Device No.
The device No. indicates the device No. for the MC for LAN connected to the server.
The MC for LAN sends its own device No. to the server, and the PBX sends the device No. for the MC
for LAN, which is the destination of the text.
The device No. to be used is defined at the PBX side.
Data type : Decimal (ASCII code)
Data size : 2 digits
Data range: 0 to 99
(5) Sequence No.
The sequence No. is a serial number for the data to be sent.
It is a number assigned to assure that the transferred data is cleared.
The PBX and server manage independent numbers respectively.
Data type : Decimal (ASCII code)
Data size : 2 digits
Data range: 0 to 99
(6) Parity
The horizontal parity check method is adopted. The calculation range is from the text identifier to the char-
acter preceding to the parity. By default, odd parity is used.
The parity check method can be changed in system data.
Data type : Hexadecimal
Data size : 1 byte
Data range: 00H to FFH 
						

							ND -7 0428 ( E)  CHAPTER 3
MCI  F O R L AN
S
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F ie ld  of  a r e co rd
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(3) Server Response Text (MC for LAN PBX)
Figure 3-5 shows the server response text to be sent by the PBX that received text identifiers (1) and (5)
to notify the MC whether or not the received text is correct.
Response No. (server information)
Data type : Decimal (ASCII code)
Data size : 1 digit
Data range: 0 to 9
0 : Normal
1 : Received text parity error
2 : Device No. not defined
3 : Received text error (incorrect text received)
4 to 9 : Not used
Figure 3-5   Server Response Text Configuration
(4) Client Response Text (MC for LAN PBX)
Figure 3-6 shows the client response text to be sent by the MC for LAN that received text identifier (2) to
notify the PBX whether or not the received text is correct.
Response No. (client side information)
Data type : Decimal (ASCII code)
Data size : 1 digit
Data range: 0 to 9
0 : Normal
1 : Received text parity error
2 : Not used
3 : Received text error (incorrect text received)
4 to 9 : Not used
S
Y
N
(X)Text
identifier
(3)Data length
(005)Device
 No.
(XX)Sequence
No.
(XX)Parity
(X) Response
No.
(X) 
						

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Figure 3-6   Client Response Text Configuration
(5) Status Monitoring Text (MC for LAN PBX)
The text shown in Figure 3-7 is defined for use in monitoring the server status from the client and the client
status from the server. In response to the text, the server sends a “Server Response Text (3)” to the client.
Client device information
Data type : Decimal (ASCII code)
Data size : 2 digits
Data range: 0 to 99
Data type
00 : Normal
01 to 99 : To be defined at MC side
Figure 3-7   Status Monitoring Text Configuration
S
Y
N
(X)Text
identifier
(4)Data length
(005)Device
 No.
(XX)Sequence
No.
(XX)Parity
(X) Response
No.
(X)
S
Y
N
(X)Text
identifier
(5)Data length
(006)Device
 No.
(XX)Sequence
No.
(XX)Parity
(X) Client
device
infor-
mation
(XX) 
						

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(6) Link Release Text (MC for LAN PBX)
Figure 3-8 shows a link release request to be sent from the client to the server and from the server to the
client. Processing is performed to release the link immediately after the text is received.
 
Figure 3-8   Link Release Text Configuration
S
Y
N
(X)Text
identifier
(6)Data length
(004)Device
 No.
(XX)Sequence
No.
(XX)Parity
(X) 
						

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2. PROTOCOL AND MESSAGE RESPONSES
2.1 Link Establishment Sequence
Figure 3-9 shows the sequence used when the client requests the server to establish a link.
 
Figure 3-9   Link Establishment Sequence Note:
The client sends a status monitoring text immediately after a link is established.
Client (MC for LAN) Server (PBX)
Connection request (CONNECT)
Connection accepted (ACCEPT)
Status monitoring
Server response textSystem equipment OK
Note
5
00Text identifier
Response No.
3
*Text identifier
Response No. 
						

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2.2 Transmission and Reception of Call Information
(1) Normal Processing Sequence for Transmission and Reception of Call Information
Figure 3-10 shows the normal sequence used when the server sends call information to the client.
 
Figure 3-10   Transmission and Reception of Call Information Sequence
Client (MC for LAN) Server (PBX)
Call information
2Text 
Received data OK Received data check
4
0Text identifier
Response No.