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Multi-Tech Systems, Inc. MVPGSM 89
Appendix A – Cable Pin-outs & Ports
Command Cable
RJ-45 Connector End-to-End Pin Info
RJ-45 connector plugs into Command Port of MultiVOIP GSM.
DB-9 connector plugs into serial port of command PC (which runs MultiVOIP GSM configuration
software).
Ethernet Connector
The functions of the individual conductors of the MultiVOIP GSM’s Ethernet port are shown on a pin-by-pin basis
below.
RJ-45 Ethernet Connector Pin Circuit Signal Name
1 TD+ Data Transmit Positive
2 TD- Data Transmit Negative
3 RD+ Data Receive Positive
6 RD- Data Receive Negative
Well Known Port Numbers
The following description of port number assignments for Internet Protocol (IP) communication is taken from
the Internet Assigned Numbers Authority (IANA) web site (www.iana.org).
“The Well Known Ports are assigned by the IANA and on most systems can only be used by system (or root)
processes or by programs executed by privileged users. Ports are used in the TCP [RFC793] to name the ends
of logical connections which carry long term conversations. For the purpose of providing services to unknown
callers, a service contact port is defined. This list specifies the port used by the server process as its contact
port. The contact port is sometimes called the "well-known port". To the extent possible, these same port
assignments are used with the UDP [RFC768]. The range for assigned ports managed by the IANA is 0-1023.”
Well-known port numbers especially pertinent to MultiVOIP GSM operation are listed below.
Port Number Assignment List
Function Port Number
telnet 23
tftp 69
snmp 161
snmp tray 162
http 80
ftp (simple) 115
SIP 5060
SysLog 514
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8