Equipment:

1
Equipment Private Branch Exchanges
2
Equipment PBXs

• Objectives for Chapter Nine PBXs
• Explain what a PBX is
• Discuss the differences between the market
  providers
• Describe the basic features and functions of a
  PBX
• Explain the reasons why an organization chooses a
  PBX
• Converse fluently about the components of the PBX

3
Equipment PBXs

• Summary of costs
• Line costs
• Table 9-1 gives dial tone lines, two way, only
• Single-line set equipment only
• Compared to Centrex configurations

4
Equipment PBX Components

• PBX components

5
Equipment A PBX

• List of components
• PBX is a stored-program, common-controlled
  device, all digital
• CPU
• Memory
• Stations
• Trunks
• Network switches
• Cabinets
• Bus, information transfer
• Console
• Cards common logic, power, etc.
• Battery pack
• Wiring infrastructure

6
Equipment PBXs

• A PBX photo

7
Equipment PBX Main Distribution Frame

• MDF
• All wires come together
• Voice, data, LAN

8
Equipment PBX Patch Panel

• Patch Panel

9
Equipment PBXs Analog Systems

• Analog Systems
• Analog system w/analog parts
• Voice call processed same as by CO
• Off hook generates I/O request signal to main
  architecture of PBX (computer) common control
• Dial tone returned
• User dials digits, in-band signaling over talk
  path
• Telephone system generates a request through the
  architecture to a trunk card (interface to CO)
• Requests dial tone from CO, regenerates the
  dialed tones/pulses across the line to CO
• CO processes call same as from residence

10
Equipment Digital PBXs

• Digital PBX
• Codec converts analog voice to digital format
• Digital signals carried down wires to CPU for
  processing
• PBX determines best route on which to process the
  call
• Digital trunk?
• Digital to digital conversion
• PBX is unipolar
• CO is bipolar (AMI)
• Analog trunk?
• Reformats digital to analog

11
Equipment PBX Purchase Deal Making

• PBX purchase
• Soft sales
• Vendors give markdowns on price, add capabilities
• Table 9-3 Summary of Costs
• Table 9-4 New Profit Margins
• Table 9-5 Summary Wiring Costs
• Table 9-6 New Costs Structure Margins
• Table 9-7 Final Configuration of System Pricing

12
Equipment Centrex for Central Office

• Central Office Centrex
• Alternative to PBX
• Offered by ILEC, CATV, CLECs
• Competition on service offerings
• CLEC may have state-of-the art, ILEC may not
• Consumer benefits
• Telephone service on a private basis
• Rented line-by-line, monthly basis w/long term
  agreement
• Feature oriented package, pay for what is wanted

13
Equipment Centrex Service

• Centrex Service
• Four RBOCs SBC, Qwest, Bell South, Verizon
• IOCs Contel GTE, Centel, Commonwealth
• Resellers, Bell authorized agents
• CATV, CLEC, Electric Companies

14
Equipment Centrex Components

• Centrex components
• CO
• CPU and bus
• Station cards
• Switching network
• Line cards
• Memory
• Common logic and power cards
• Peripheral Devices
• ACD
• Voice mail
• Automated attendant
• CDR
• Modem pools
• Multiplexer
• Head sets
• Display sets (telephones)
• Paging
• Least cost routing

15
Equipment PBXs

• Objectives for Chapter Three PBX, ACD, CTX, KTS