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33 Cards in this Set

  • Front
  • Back
- What are the 2 types of edges devices used in a telephony network?

C1
- Analog telephone and Digital telephones (it’s an edge devices because it terminates the service provided by the local telephone company)

C1
- What is the local loop?

C1
- It is the interface to the telephone company network (It’s the pair of wires that come to your house to provide residential telephone service.)

C1
- The CO switch is used for what?

C1
- Used to terminate local loop
- Handle signaling,
- Digit collection
- Initial call routing decision
- Call setup
- Call teardown


C1
- What is the primary function of a Trunk?

C1
- It’s to provide the path between 2 switches

C1
- What is a Tie trunk?

C1
- A dedicated circuit that connects PBX directly

C1
- What is a CO trunk?

C1
- A direct connection between a local CO and a PBX.

C1
- What is an interoffice trunk?

C1
- A circuit that connects two local telephone company COs

C1
- The CO makes the telephone work with 5 components?

C1
- Battery
- Current detector
- Dial- generator
- Dial register.
- Ring generator


C1
- Switching systems provide 3 primary functions?

C1
- Call setup, routing and teardown
- Call supervision
- Customer ID and telephone numbers.


C1
- What is a PBX?

C1
- The private branch exchange is a smaller version of the CO switches used by telephone companies. It’s connected to the telephone handset using a line card and to the local exchange using a trunk card.

C1
- What are the 3 majors components of a PBX?

C1
- Terminal interface
- Switching network
- Control complex


C1
- The key system (not a switch unlike the PBX) is an alternative to the PBX, mostly used in office with 30 to 40 users, what are the 3 major components?

C1
- Key service unit.
- System software
- Telephones


C1
- What is the main difference between a key system and a hybrid telephone system?

C1
- The main difference is whether a single-line telephone can access a single CO local loop or trunk only (key telephone system),

or whether the single-line telephone can access a pool of CO local loop or trunk (hybrid telephone system.

C1
- What is call signaling?

C1
- It’s the capacity of a user to communicate a need for service to a network

C1
- What are the 3 types of call signaling? (Note; all 3 types must be carried across both analog and digital connections.)

C1
- Supervisory; a subscriber and telephone company notify each other of calls status with audible tones and exchange of electrical current.

- Address signaling; (DTMF or Pulse)

- Informational signaling; (Tone combination indicates call progress; Busy, Ring back, Congestion..etc)


C1
- What are the 3 majors steps in an end-to-end call?

C1
- Local signaling – originating side: User signal the switch by going off hook

- Network signaling: switch makes a routing decision

- Local signaling – terminating side: signal to the call recipient


C1
- What are the 3 types of supervisory signaling

C1
- On hook
- Off hook
- Ringing


C1
- What are the 2 types of address signaling used to notify the telephone company?

C1
- DTMF; each button associated with low and high frequencies are pressed to notify the telephone company of the number being dialed.

- Pulse; large numerical dial wheel.

C1
- Name 3 types of digital connections used for PBX connections (that is the connection between the PBX and the switch – or network)

C1
- T1 (hold the CAS – in band)
- E1 (hold the CAS – out of band)
- PRI/BRI (hold the CCS)


C1
- What is CAS (carried by a T1 or E1 in a digital PBX connection to the network)

C1
- CAS = Channel associated signaling
- Method that allows passing on-hook or off-hook status by setting bits that are associated with each specific voice channel.


C1
- What is “ out of band “ signaling?

C1
- The signaling and the voice path and do not share the same channel.

C1
- What is the channel used by an ISDN connection to carry the signaling messages for all other channels?

C1
- The D channel.

C1
- All 3 types of call signaling are used when you place a phone call from home. Can you explain how?
C1
- When the handset is lifted – this notifies the telephone company (that’s supervisory signaling)

- When the telephone company sends you the dial tone (that’s informational signaling)

- When you dial the digits by pressing numbers (that’s address signaling)


C1
- Multiplexing techniques have been implemented for what?

C1
- The make better use of 2 wire or 4 wire connections in order to carry multiple conversation at the same time.

C1
- List and describe 2 multiplexing techniques

C1
- TDM; Time-Division Multiplexing = used extensively in telephony networks to carry multiple conversions concurrently across a four-wire path. Used in digital connections

- FDM; Frequency-Division Multiplexing = involves carrying multiple voice signals by allocating an individual frequency range for each call. Mostly used in analog connections- cable or DSL (digital subscriber line) to allow simultaneous use of multiple channels over the same wire.


C1
- DSL is an example of which style of multiplexing?

C1
- Frequency-division

C1
- Which multiplexing technique is used by TDM?

C1
- Timeslots are assigned to different channels, regardless of whether there is data to transmit.

C1
- How does CAS pass signaling?

C1
- In the same channel as voice for T1

C1
- What type of signaling is “signaling that uses either pulse or DTMF”?

C1
- Address signaling

C1
- What type of signaling is “signaling that provides call-progress indicators to the initiator of a call“?

C1
- Informational signaling

C1
- What type of signaling is “signaling that monitors on-hook/off-hook transitions and provides call notifications “?
- Supervisory signaling
- At what point is the dial tone generated?
- When the digits register is ready
- Which type of trunk connects two local telephone company COs?
- Interoffice trunk