186 lines
8.5 KiB
Plaintext
186 lines
8.5 KiB
Plaintext
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<-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><->
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<-> <->
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<-> ESS1 & 1A Switching Systems <->
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<-> <->
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<-> Researched and Compiled by <->
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<-> -=+NINJA MASTER+=- <->
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<-> <->
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<-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><->
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<-> "Forever Servicing The Phreak/Hack Community" <->
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<-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><->
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Hello, and welcome to the first in a continuing series on the ESS1 and 1A
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switching systems. The information in this series had been obtained from my
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knowledge and by trashing various empire (AT&T,BELL) trash binns.
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In this first file I will start off with a very basic review of what the
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ESS system is, and will then go on to talk about some other things you
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will find interesting.
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-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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The ESS System In Review
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------------------------
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ESS (Which stands for Electronic Switching System) was designed by good old AT&T
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in the state of the art labs of the computer-controlled space-division. The
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principle is simple, you have a switching system that is controlled by simple
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electronics and stored computer programs. (not to be confused with CCIS which is
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just a interoffice command link).
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The ESS system is a class 5(End Office) system, and has some spinoffs (like the
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No. 10A RSS [Remote Switching System]). It uses digital transmissions, although
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they must be converted to analog by a hybrid as this is what kind of electronics
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AT&T chose to use.
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The ESS is divided in to seperate modules, so as to make repairs and additions
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easier. Each module is connected to the system by interfaces (one of which will
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be covered later). In a whole, the ESS system provides the standard BORSCHT
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functions, plus some extra ones.
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Well, them there's the basics, now on with the good, technical, informational,
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fun stuff.........
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-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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ESS1A Procesor
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--------------
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The follwing is about the 1A Processor, and will give you an understanding on
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how it functions.
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The 1A processor is used for a number of ESS systems, but most specifically is
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used for the following:
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o To control the 4 ESS switch.
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o To control the 1A ESS switch.
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o To be added to older 1 ESS switches, so as to update it to a 1A ESS.
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o To support future switching systems.
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o To accommodate bulk memory systems.
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o And to provide real time and continuous control through highly automatic
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maintenance. (less than 2 hours downtime in 40 years continuous operation).
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The 1A processor uses stored programs, and operates in a real time environment.
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The processor can function without being hooked up to the switching network.
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The processor is devoted to internal maintenance and administrative tasks. So
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TELCO employe's can monitor the processor (from now on called the 1A) it is
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hooked up to control panels and to I/O terminals. (which, incidentally
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interface with software defined I/O channels).
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All frames (they make up the 1A) sent out from the 1A are duplicated.
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So that a failure from one won't screw up and equipment.
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The following is a high level block diagram of the 1A:
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_________
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|Attached |
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|Processor|_________
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|System | |
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--------- |
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| ___________
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___________ | | |
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| | ^ | Auxiliary |
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| File Store|----< <-------------------*-----------------| Data |
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| | | | System |
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----------- | | |
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| -----------
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| AU BUS
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___________ __________|_________ ____________
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| | | | | |
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| Program | PS Bus | Central | CS Bus | Call Store |
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| Store |---------------| Control |-------------| |
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| | | | ------------
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----------- ----------|---------
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| PU Bus ___________ Data and
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| | | control
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*------------| I/O |-------------
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| | Interface | to/from
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| ----------- terminals
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| |E2A Telemetry
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| PU Bus |Control
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Status | |
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_________ And ________|_______ |
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| | Control | |<---------- Pu Bus To/From
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| Control |-------------------| Periphel |--------------------------using
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| Panels | | System | system
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| | | Interface | peripheal
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--------- | |
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| | E2A Telemetry Control Inhibit
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to No. 2 Telemetry Data | |<----------------------\
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SCCS And Control | | | From
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Maintenance-------------------| |<--Office--Alarms-------|Using
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Facility | | |System
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| |<--Building--Alarms----/
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----------------
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LEGEND
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------
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AU--Auxiliary Unit
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CS--Call Store
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PS--Program Store
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PU--Peripheral Unit
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SCCS--Switching Control Center System
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About the above:
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Central Control: Interfaces with the 1A, and performs the processing functions
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of the 1A. It also executes all maintenance routines.
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Program Store: High speed semiconductor that stores program instructions, and
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system configuration system.
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Call Store: Similar to the above, but is used for storage translation data, and
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frequently changed call processing data, such as:
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o Status of trunks and switching network.
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o Records of network terminations used for each call in progress.
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o Digits received and digits to be outpulsed.
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o Maintenance data related to programmed diagnostic tests.
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Call store also includes an emergency system recovery program, used to
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establish a working system of a program store failure.
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File Store: Magnetic disk memory, used for program backup.
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Attached Processor System: 3B20D computer, of which one or more are used as
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slave processors (used for multitasking, ect.)
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Auxillary Data System: Magnetic tape system used to store and retrieve data
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such as system reinitialization, memory dumps, ect......
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I/O interface: Used to connect 1A to terminals used to input control mesages,
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and to recieve status messages.
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Peripheral System Interface: Serves as the main junction between all peripherals.
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Control Panels: An additional I/O device used to monitor the 1A, and to
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exercise manual control over the 1A.
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Downloaded From P-80 Systems 304-744-2253
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