Avaya 6424D+M User Manual page 18

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OVERVIEW: SYSTEM 85 AND DEFINlTY GENERIC 2 WITH TRADITIONAL MODULES
MC
The MC, or communications switching module, is the basic building block of the multimodular
architecture. Each MC is capable of supporting up to 1536 analog ports and 256 simultaneous full-
duplex conversations.
Remote Modules
System 85 and DEFINITY Generic 2 with traditional modules can have remote modules located up to
25,000 ft away from the CC and TMS. The number of remote modules cannot exceed the number of
modules at the central switch location (15 maximum). The call control (including call processing,
administration, and maintenance) is multiplexed onto the fiber-optic link; thus all system features are
available to remote locations. Remote modules with optically-remoted peripheral interfaces (ORPI) for
attendant consoles have a maximum range of 13,000 ft.
The recommended fiber size for remote-module links is the AT&T graded index multimode fiber with a
62.5-micron core and 125-micron outer diameter.
RGI
Small groups of voice and data terminal users at remote locations can be connected to the central switch
by a digital service level-1 (DS1) link that uses remote-group interface (RGI) circuit packs as the DS1
interfaces. The RGI circuit packs are installed in the DSl/MFAT carrier of the central module and in
the remote-group housing (RGH) at the remote location.
The maximum distance that a remote group can be located from the central module is 100 mi over T1
lines with repeaters. A direct cable connection between the central module and the remote group can be
a maximum of 1310 ft with the option switches on the RGI circuit packs properly set. To extend the
distance beyond 1310 ft. a channel service unit (CSU) must be installed at each end of the DS1 link.
Remote Module and Remote Group Documents
Detailed information about the configurations, designs, hardware components, and construction of fiber-
optic links for remote modules and DS1 links for remote groups appears in About This Document.
Port Packs
Port packs are circuit packs that are housed in the carriers in the port and MC cabinets. These circuit
packs provide the line and trunk circuits for System 85 and DEFINTTY Generic 2 with traditional
modules. The circuit packs also contain the interface that allows the MC to govern the connections.