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Dual Switching System
58-003This training system covers all of the work that can be performed with the Digital Switching System 58-002 and extends it to include trunk switching and message handling. The System has an additional Digital Switching Centre and its four associated telephones and includes eight extra assignments to extend the curriculum to trunk traffic topics.
The work that can be carried out with this Trainer progresses from the investigation of local and interswitching centre numbers and their origination, through trunk switching, highways and timeslots, to call state transition diagrams and call records for a two switching centre system. CCITT (now ITUT) codes and formats are used.
The Trainer is computer-controlled and uses Discovery software: an integrated instructional and hardware control program which includes logic analysis and display of results.
The instruction is essentially non-mathematical and is particularly suited to vocational and technician level courses, or for the introductory principles required for further study of telephony systems in undergraduate courses.
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Features
- Easily configurable for different exchanges
- Can be easily upgraded from 58-002
- Uses ITU-T codes and formats
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Subject Area
- Local Signalling
- Operation
- Tones and Cadences
- Digital Switch Principles
- Time Switching
- Time & Space Switching
- Digital Switch Control
- Control of Time Switch
- Connection of Tones
- Line Scan
- Switch Hook
- DTMF Receivers
- Call Records
- Call State
- Line Identities
- Call Time
- Line Records
- Directory Numbers
- Call Accounting
- Line Maps
- Location Maps
- Condition Maps
- State Transitions
- Inputs, Outputs
- Tasks
- Call Progress
- Call Set Up
- Call Suspension
- Call Release
- Manual Control
- Control, Testing
- Test Out and Loop Back
- Traffic, System Traffic
- Trunk Configuration
- Trunk Paths
- Numbering
- Tones and Cadences
- Trunk Switching
- Outward Path
- Return Path
- Signal Protocol Controller
- Flags
- Frame Check Sequence
- Zero Insertion
- Trunk Signal Units
- Message Signal Units
- Fill-In Signal Units
- Signalling Information
- Field
- Label
- Heading Codes
- Address Signals
- Error Control
- Sequence Numbers
- Buffers
- Trunk State Diagrams
- Originating Switch
- Dialling
- Destination Switch
- Trunk Call Progress
- Originating Switch
- Dialling
- Destination Switch
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The Feedback 12-300 Basic Electronics Series is now complemented by the addition of two new workboards that provide an introduction to digital electronics.
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