Ring Communications CB901EX - Manual (Page 5)

April 2012 Operations Manual CB901EX
INTRODUCTION
Ring-Master system CB 901EX is an all-to-all direct speech system, controlled by a fully
electronic central exchange. All its functions are microprocessor controlled. This enables the customer
to select from a wide range of programmable features designed to achieve flexibility and optimal
efficiency in internal communication.
A built-in Lithium battery will secure all programmed information up to 10 years when power
to system is switched off.
The modular structure of the central permits easy expansion, station by station, from 2 up to a
capacity of 7.,170 subscribers. Moreover, a wide variety of station types, matching the needs of almost
any user, whether institutional, industrial or commercial applications, increases the flexibility of the
system.
The unique cabling concept provides the advantages of both centralized and decentralized
cabling arrangements. Each station requires one single pair for dialing and conversation. Power can
either be individual to each station or remote groups of stations can be supplied from local mains
power units. The cabling is ordinary telephone wires.
The central unit is compact. A standard basic cardrack equipped for 80 subscribers measures
only 256 mm x 570 mm x 271 mm (10.1" x 22.4" x 10.9"). Silent in operation, once fitted with its
cover, the central can operate inconspicuously in almost any location.
In a single-Stage system, the central unit consists of a Basic Cardrack DP 979 containing the
Basic Cardset and Subscriber Cards, totaling 88 subscribers. If the number requirements exceed this, an
additional Subscriber Cardrack DP 980 is necessary, giving a maximum capacity of 240 subscribers in
a single-stage system.
Each single-stage of 240 numbers is equipped with 15 internal links.
The number of subscribers in a CB 901EX system may be expanded in steps of 8, plugging in
subscriber cards.
The basic cardrack 10 subscriber cards = 80 subscribers
The subscriber cardrack 20 subscriber cards = 160 subscribers
Giving a maximum capacity of 240 subscribers, each with access to the 15 links.
Each stage in the central unit consists of a basic cardrack for the common basic cardset, and
according to the number capacity, an additional subscriber cardrack.
All cards in a CB 901EX system are of plug-in type, interconnected via the motherboard in each
cardrack.
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