Sekotech ST-300 SPIDER, Руководство по эксплуатации, Страница: 66 / 68

ST300 SPIDER
64
RJ contact RJ25 RJ14 RJ11 contemporary
coloring
obsolete
coloring
1 X white and green orange
2 X X white and orange black
3 X X X blue red
4 X X X white and blue green
5 X X orange yellow
6 X green blue
6.4. WIRING SCHEME OF A 3, 2, AND 1 TWISTED-PAIR CABLE
6.5. REFERENCE INFORMATION ON TELEPHONE LINES
Types of telephone lines
line type purpose user device(s)
two-wire
1
analogue municipal telephone line
PBX analogue line
analogue telephone
two-wire
2
digital office PBX digital line digital telephone
four-wire digital office PBX digital lines digital system telephone
four-wire hybrid
3
office PBX hybrid lines analogue system telephone
1
– analogue signals are transmitted over PBX lines of this kind.
2
– in a digital PBX, the analogue electric signal in the speech frequency band is transformed into a
coded digital electric signal, that only has two logical values, “0” and “1”.
3
– in a hybrid PBX, a “non-digitized” analogue signal in the speech frequency band is transmitted
without conversion. The programming of hybrid PBX’s is similar to that used in digital ones. The term
‘hybrid’ means that both system and analogue telephone sets can be plugged in.
Wire pairs carrying telephone line data
line type RJ connector contact # in the
RJ connector
wire coloring
modern obsolete
two-wire analogue
RJ-9
(2-3)- analogue
signal
RJ-11/14/25
(3-4) analogue
signal
two-wire digital RJ-11/14/25
(3-4) digital
signal
four-wire digital RJ-14/25
(3-4)– digital
signal
(2-5) – PBX
commands
four-wire hybrid RJ-14/25
(3-4)– analogue
signal
(2-5) – PBX
commands