Chapters 1 & 2 Flashcards
An analog circuit is composed of what two things?
Wires
The ground is on which part of the wire in Analog phones?
Just the tip
Aside from the ground, what is the other part of the analog voice wire?
The battery (positive) ring
What is glare?
The phone is picked up at the same time as a call comes through before it rings
When a telephone has buttons that when pushed directly access an outside line it is using what?
A Key System
What is used to carry multiple digital voice conversations?
Time Division Multiplexing
T1 lines can carry up to __ separate __Kbps channels
24, 64
Channel Associated Signaling uses the _th bit of every _th frame
8, 6
What is PBX?
Private Branch Exchange
Ground Start Signaling reduces what common problem?
Glare
How does Ground Start Signaling work to reduce glare?
Phones don’t receive a dial tone until the phone company receives a ground signal
What type of signaling communicates the state of a telephony device?
Supervisory
What type of signaling is used when you dial numbers on a phone?
Address signaling
When you pick up the phone, the phone is now ___ hook
Off hook
Rotary telephones use what type of dialing?
Pulse
Modern telephones use what type of dialing?
Dual-tone multi-frequency
What type of system would be used by Telco companies for billing purposes?
Signaling System 7 (SS7)
With a PBX, how would you access outside trunks from a phone?
Most systems use 9, then the number. However that number can be changed.
In a PSTN, where is the local loop?
The link between the customer premises and the telco provider
What device allows businesses to operate a “miniture PSTN” inside of it’s company?
Private Switch (PBX)
Canada and USA use what numbering plan?
North American Numbering Plan (NANP)
How many digits are in a NANP number?
10
[True or False] This NANP number is valid 180-558-1205
No, the area code cannot start with a 0 or a 1
In NANP, what are ERC numbers?
Area codes where the second and third digits are the same.
