CHAPTER 31. Digital Voice Port
526
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(Continued)
Step
Command
Purpose
9
timing wink-duration
milliseconds
(E & M only) Specifies maximum wink-signal
duration, in milliseconds, for a wink-start signal. Valid
entries are from 100 to 400. The default is 200.
10
timing wink-wait
milliseconds
(E & M only) Specifies maximum wink-wait duration,
in milliseconds, for a wink-start signal. Valid entries
are from 100 to 5000. The default is 200.
11
Exit
Exit the voice-port configuration mode.
T1-CAS FXO Features
Foreign eXchange(FX) signaling was originally developed to connect remote
Private Branch Exchanges(PBX’s) to the(Bell System) Central Office.
These PBXs(and other Central Offices) were considered ‘Foreign’ not because
they were outside the country, but because they didn't belong to the ‘Phone
Company.’ A FXS(FX-Subscriber) interface will be connected to a matching
FXO(FX-Office) interface at the far end.
Note that audio paths(such as the ‘CO sends Dial Tone’ path) are not usually
considered part of the FX signaling. They are included to make the examples
easier to understand.
Figure 31.9 T1 CAS FXS/FXO signaling operation
Loop Start
As shown in the POTS diagram above, Loop Start signaling uses only two
basic states: Ringing(sent to the FXO interface) and Off-Hook(sent to the FXS
interface). Loop Start signaling is the most common type of signaling
deployed in the PSTN.
T1
Circuit
FXS
FXO
FXS
‘FXO’
CENTRAL
OFFICE
SWITCH
Loop Start
Phone
Originating Call
Loop Start
Phone
Terminating Call
CO Rings FXO
FXO goes OFF Hook
FXO goes OFF Hook
CO sends Dial Tone
FXS Rings Phone
Phone goes OFF Hook
Phone goes OFF Hook
Dial Tone heard
Summary of Contents for Ubigate iBG3026
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