lesson 5 Flashcards
1
Q
call signaling methods
A
- supervisory signalling (loop-start or ground start)
- address signaling (pulse or dtfm)
- information signaling (call progression tones)
2
Q
loop start signaling
A
- used for residential phones
- has glare
3
Q
glare
A
-when an incoming call happens at the same time as an outgoing line is requested
4
Q
ground start signaling
A
- used in industry
- fixes glare
5
Q
information signaling
A
- call progression tones
- provide an indication of call status
- regional
6
Q
north american call progression tones
A
- dial tone
- busy signal
- ringback
- reorder (congestion)
- receiver off-hook
7
Q
pstn integration
A
-gateways use different interfaces to connect to non ip devices
8
Q
analog pstn interfaces
A
- foreign exchange station (fxs)
- foreign exchange office (fxo)
9
Q
digital pstn interfaces
A
- t1, cas or ccs
- e1, cas or ccs
10
Q
fxs
A
- foreign exchange station
- provides dial tone and power
- uses supervisory signaling
- processes address signaling
- provides call progression tones
- has a station id
- used by pstn or pbx
11
Q
fxo
A
- foreign exchange office
- uses supervisory signaling
- provides address signaling
- answers on a defined ring number
- relays caller id
- used by end device
12
Q
cas and ccs
A
- channel associated signaling
- common channel signaling
13
Q
esf
A
- extended super frame
- t1 framing standard
14
Q
b8zs
A
- bipolar 8-zero substitution
- t1 encoding method
15
Q
call types
A
- local (does not traverse wan or pstn)
- on net (between two phones on the same data network, incl. wan)
- off net (traverses pstn)
- plar (automatically connects two phones)
