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TELECOMMUNICATIONS CONCEPTS

TELECOMMUNICATIONS CONCEPTS. & COMPONENTS. Key Systems. Thought For The Week No Question Is A Bad Question!. KSU. Key Systems Are Fairly Simple On-Site Telephone Systems Geared To Organizations With Fewer Than 100 Telephones. At The End Of Lesson 5, You Should Be Able To:

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TELECOMMUNICATIONS CONCEPTS

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  1. TELECOMMUNICATIONS CONCEPTS & COMPONENTS Key Systems Thought For The Week No Question Is A Bad Question! KSU

  2. Key Systems Are Fairly Simple On-Site Telephone Systems Geared To Organizations With Fewer Than 100 Telephones. • At The End Of Lesson 5, You Should Be • Able To: • Describe The Components Of A Key System • Describe The Type Of Business That Would • Most Benefit From a Key System • Explain The Limitations Of Key Systems

  3. Key Point Key Systems Provide Multiple Telephones Access To Any Of Several Lines.

  4. KEY TELEPHONE SYSTEM DEFINITION • A System In Which The Telephones Have Multiple • Buttons Permitting (Requiring) The User To • Directly Select Central Office Phone Lines And • Intercom Lines.

  5. Key System Components A Key System Provides Multiple Telephone Extensions Access To A Group Of Single Telephone Lines. To Connect A Telephone Extension To A Line, A Caller Simply Presses One Of The Unlit Line Buttons.

  6. Key System Components The Concept Of Key Systems Is Illustrated On The Key Telephone System Diagram Which Is Different From The Diagram In Our Text.

  7. A SAMPLE 6-12 KEY SYSTEM 66-Type Block 12 Key Telephones • . • . Six Incoming Telco Lines • . KSU Power Supply

  8. Key System Components The Main Point To Remember About A Key System Is That It Can Support Only As Many Incoming Or Outgoing Telephone Calls, Or “Call Paths,” As There Are Lines Installed.

  9. KTS's - SIX MAJOR PARTS • Key Systems Are Digital. • KTS’s Have Six Major Parts. • KSU • Line Interface. • Station Interface. • Power Supply. • Connectivity. • Key Sets (Key Telephones).

  10. SAMPLE KEY TELEPHONES • Acronym For A Key Telephone System – KTS • A Telephone System That Has Multiple Buttons • That Permits The User To Directly Select Central • Office Phone Lines. Speaker Single-Line Key Telephone 2 Line x 16-Character LCD Display 8 Key Set 1 Line-Selection Button 1 Hold Button 1 Line- Intercom Button

  11. SAMPLE KEY TELEPHONES - CONTINUED - 10-Line Key Telephone With 12 Programmable Buttons Key Set With Busy Lamp 12 Programmable Buttons 1 Hold Button 10 Line-Buttons 1 Line- Intercom Button Speaker

  12. KTS TECHNOLOGY - KSU • KSU (Or Key Service Unit) Contains A Space • Division Switching Matrix Under The Control • Of A Microprocessor.

  13. KTS TECHNOLOGY - KSU - CONTINUED - • KSU Is The Main Part Of A Key Telephone • System. • KSU Contains The Electronics That Control • Which Line Is Directed To Which Phone. • KSU Is Usually Mounted In A Closet Near The • Telephone Company’s Demarcation Point.

  14. Key System Typical Wiring KSU Switching Matrix Line Circuit Line Circuit T T Line Circuit R R Line Circuit Line Circuit T T Line Circuit R R Control Signal Central Office CPU

  15. MORE KTS TECHNOLOGY • A Single-Line Telephone Like A 2500 Set Usually • Will Not Work With A Key System Because Key • Systems Use Proprietary Signaling Protocols. • Also, Multi-line Phones Made By A Manufacturer • Other Than The KSU Manufacturer Will Not • Usually Work.

  16. Key System Features • Key System Phones Usually Have: • One Button For Each Outside Line. • One Hold Button. • One Intercom Button. • When A Multi-Line KSU Phone Goes Off-Hook – • Nothing Happens Until A Line-Button Is Selected. • When Off-Hook & A Button Is Selected, The • Phone Sends A Signal Over The Signal Pair To • The Microprocessor.

  17. Key System Features - Continued • This Signal Will Cause The KSU Switching • Matrix To Connect The Phone To The Desired • Outside Exchange. • Dial Tone Is Then Received From The CO. • The Phone Sends DTMF Tones Over The Voice • Pair Using The DTMF Pad. • KSU Nomenclature – A 612 Key System Can • Handle Six Exchange Lines & Twelve Multi-Line • Systems.

  18. Key System Automated Attendant • In A Key System, One Station Is Designated As • An Attendant Position. • This Station Rings On All Incoming Calls. • Once The Attendant Answers The Call, They Put • The Call On Hold And Use The Intercom To • Signal A Station To Pick Up The Appropriate • Line, Or Flashes A Light. • Many Key Systems Are Capable Of Automatically • Answering Calls And Requesting Callers To • Identify Which Department/Person They Want.

  19. Cordless Key Systems Provide Employees Telephone Service While Allowing Them Freedom of Movement. Wireless Transmission Is Used to Connect These Mobile Extensions to the Main Business Lines, And To Each Other By Means Of Intercom Features.

  20. Cordless Key Systems This Type Of Technology Is Presented On The Cordless Key System Diagram. Cordless Key System

  21. Hybrid Systems The Term Hybrid Was Used To Describe A Telephone System That Includes Features Of Both A Key System And PBX. A Characteristic Of A Hybrid Key System Is The Grouping Of Outside Trunks Into Pools, By Function Or Organization.

  22. Hybrid Systems Electronic Key Telephone Systems (EKTS) Often Cross the Line Into the PBX World, Providing Switching Capabilities. EKTS Is A Key Telephone System In Which Electromechanical Relays And Switches Have Been Replaced by Electronic Devices.

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