1. PSTN Distribution Frames
  2. –An aggregation point at the CO that is a high-density cross-connection point where subscribers’ loops are connected into a feed cable (hundreds of pairs in a single cable)
  3. Main Distribution Frame (MDF)
  4. –Distribution frames with smart switching or encoding equipment
    • –Often used to facilitate DSL
    • –Aggregates large bunches of customer copper loops into optical links to connect to the CO (for an organization, for example)
  5. Building Distribution Frame (BDF)
    Distribution frame where building cabling converges
  6. Inside wiring
    • Privately owned cabling and wiring on the customer side of the demarc
    • –Also called cable plant
  7. Customer Premise (CP) Distribution Frames
  8. –Customer premise distribution frames
    • –Aggregated and centralized cross-connect blocks, terminals or patch-panels.
    • –Called CP distribution frames by the phone number, called the MDF by the organization’s technicians
  9. Customer Premise Equipment (CPE)
  10. •Any equipment installed by the phone company at the customer’s site for use in terminating voice calls
  11. FXS (foreign exchange station) Interface
  12. –Signaling used to serve analog phones
    • –An FXS interface is on a switch, and has a phone connected to it
    • –Uses FXO signaling
  13. •FXO (foreign exchange office) Interface
  14. –Signaling used by phones or PBXs that are connected to the CO switch
    –Uses FXS signaling
  15. Dial Plan
  16. •The rules governing call-routing behavior of the PBX
  17. Plain Old Telephone Service
  18. •This service provides a dial tone to rotary and touch-tone telephones, as well as access to national and international carriers.
  19. Custom Calling Features
    . Signaling System 7 (SS7) messaging and service enablers are not required to operate these features

    • –Call forwarding — Enables calls to follow as the subscriber moves from one location to another
    • –Call waiting — Indicates an incoming call when the subscriber is already involved in a call
    • –Three-way calling — Enables subscribers to conference a third party in on a conversation
    • –Speed dialing — Provides a convenient way for subscribers to store frequently used numbers (this is often provided via the memory of the end-user phone)
    • –Added number — Enables subscribers to add a second line that they can identify by a distinctive ring and call-waiting tones
  20. CLASS Features
    •CLASS is a popular suite of features available to subscribers.

    SS7 messages and functions are then invoked and sent within the network to perform the requested operations.
  21. Voice Mail
  22. •PSTN-based voice mail enables SPs to offer an alternative to answering machines. Subscribers do not need to purchase or operate any additional equipment
  23. Business Services
  24. •Business services are important to SPs because they represent a large portion of SP's revenue base.
  25. Virtual Private Voice Networks
  26. •Virtual Private Voice Networks cost-effectively interconnect corporate voice traffic between multiple locations over the PSTN.
  27. Centrex Services
  28. •Centrex enables SPs to offer smaller businesses voice and data services similar to those found in larger and more costly private solutions.
  29. Centrex Services
  30. –Call handling — Includes call waiting, call forwarding, call park, hunt grouping, and voice mail
    • –Convenience features — Include automatic dial, speed dialing, ring again, and calling line identification (caller-ID)
    • –Custom dialing plans — Provide customized plans for each customer group and enable abbreviated dialing for internally placed calls
    • –Management — Can track and control various aspects of a business' service
    • –Security — Includes line restrictions, employee authorization codes, virtual access to private networks, and detailed call records to track unusual activity
  31. Call Center Services
    –Automatic call distribution (ACD)— Efficiently routes incoming calls to multiple answering stations.

    –Switch-Computer Applications Interface (SCAI)—Enables SP switches to communicate to the call center computer for appropriate call routing and handling.
  32. Service Provider Services
  33. •Service provider (SP) services are internal functions provided in the background to support PSTN users. They include number translation, routing, calling services, and special assistance.
  34. Database Services
  35. •Databases enable SPs to maintain, access, and translate information used to support special service and access numbers.
  36. Operator Services
    • Toll and assistance
    • Directory assistance
    • Billing services
Card Set
CH 5