Operation
M7/M7L/M7LT Modular Satellite Modem
1-14
M7/M7L/M7LT - Rev. 0.05
1.5.3.
Data Interfaces
The modem is capable of accepting interface cards that provide connectivity to a number of different
baseband interface types. These interfaces can be installed as a single interface or may be installed
in a dual interface configuration. As required, additional interfaces will be added to the M7 options list
to accommodate new capabilities. The currently available interfaces include:
Multi-protocol Synchronous Serial Data interface (S7)
Advanced IP interface with internal bridge/router (I7)
Express Ethernet interface (E7)
Dual G.703/E1 with Drop and Insert interface (G7)
High Speed Serial Interface (HSSI) (H7)
Installed option interfaces are automatically recognized by the modem, making them a selectable
option on the front panel or remote control protocols. Refer to the optional interface appendix for
detailed information on each of the interface options.
1.5.3.1.
Multi-protocol Synchronous Serial Data interface (S7)
The Synchronous Serial Data Interface is considered the standard baseband interface for the M7
(Figure 1-11 and contains the drivers and receivers for one of seven possible data interface
standards. All interface standards are selected under program control via the front panel or remote
control. These standards are common interfaces used in the communications industry:
RS-232
RS-449
RS-449/Unterm
V.35
X.21
EIA-530
EIA-530A
A single 25
pin “D” type female connector is available on the rear panel at J11 providing the terrestrial
data interface. The interface standard is electronically selectable via front panel or remote control.
Figure 1-11 - Synchronous Serial Interface
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