Instruction manual

Glossar
148 025-9416
Term Definition
Maintenance Port
An RS-232 data communication interface between the Model 640 and
the office PC. It can be either a local serial connection or a remote
modem connection. The maintenance port is needed for updating the
database and modifying system operating characteristics. Zetron
strongly recommends that a modem maintenance port be available at
all times for factory support and troubleshooting.
Matrix Plug
A small four-position circuit card that plugs into the dual trunk card to
set the telco line type. Each trunk card has two matrix plugs; one for
each of the trunks. The label on bottom of the matrix plug facing the
rear of the trunk card indicates the current line type configuration.
MCU (Model 640
Communication
Utility)
Zetron’s communication software for use with the Model 640 paging
terminal. MCU provides a user-friendly interface to the paging
terminal for system management, ZLINK maintenance, and database
programming. MCU uses a local serial connection or a remote modem
link to communicate with the Model 640.
Menu
Any set of options that allows the user to navigate through the data-
base or communication functions. A menu does not allow the operator
to enter or alter any data directly; it simply provides a path to a data-
base record or another menu.
Microwave (µwave)
Radio frequency commonly used for long-distance telephone commu-
nications. (Frequencies above one gigahertz - 1,000 MHz.)
M (mouth) Lead
The transmit line of an E&M trunk.
Modem
A computer communications device that transmits and receives analog
data over telephone lines for remotely located systems.
Modem Initialization
String
A set of commands issued to a modem to define its operating charac-
teristics. The modem initialization string usually consists of standard
Hayes “AT” commands. Refer to the modem manual for model-
specific commands.
MODEM LED
A light on the front panel of the paging terminal indicating when a
modem communications link has been established between the Model
640 and the office computer. This LED flashes rapidly during data
transfers and flashes intermittently when a link is present but no data
is being transferred.
Morse Code ID
A station identification sequence assigned by the FCC when an RF
transmission site license is acquired. The ID is usually a set of 8-10
call letters that uniquely identify the licensee. The ID is played over
the air at a specified interval to comply with FCC regulations.
Multi-frequency (MF)
A touch-tone protocol used in telephone equipment. MF is similar to
DTMF, but uses different combinations from another tone set. Unlike
DTMF, MF signaling is used between switches in the network rather
than by the subscriber.