Samsung Ubigate iBG3026 Configuration Manual page 568

CHAPTER 31. Digital Voice Port
Step
9
10
11
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.
CENTRAL
OFFICE
SWITCH
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.
526
Command
timing wink-duration
milliseconds
timing wink-wait
milliseconds
Exit
FXS FXO
CO Rings FXO
FXO goes OFF Hook
FXO goes OFF Hook
CO sends Dial Tone
Figure 31.9 T1 CAS FXS/FXO signaling operation
Purpose
(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.
(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.
Exit the voice-port configuration mode.
FXS
T1
FXS Rings Phone
Circuit
Phone goes OFF Hook
Phone goes OFF Hook
Dial Tone heard
(Continued)
'FXO'
Loop Start
Phone
Terminating Call
Loop Start
Phone
Originating Call
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