OfficeServ 7100 Service Manual
© SAMSUNG Electronics Co., Ltd.
1-9
1.3.2 Eelectrical Standard
The signal processing protocol indicates the method to connect signal between the C.O./extension
line and the system and to provide the status information.
Loop Start C.O. line Signaling
The on-hook and off-hook status is controlled by the electric current flow in the loop start
signal processing. Loop indicates the closed loop C.O. circuit or standard 2500 type set loop.
Figure 1.2 Loop Start C.O. line Signaling
T1 C.O. line Signaling
The electric characteristics of Ti C.O. line observes ITU G.703 and G.704 standards.
Table 1.7 Electric Characteristics of T1 C.O. line
Category
Description
Transfer Rate
1544 kbit/s ± 50 ppm
Code Alternative
Marking
Inversion(AMI)
or
B8ZS
Pulse Type
The mask feature satisfies ITU G.703.
Signal Standard, Signaling method
ITU G.703 and G.704 standards are satisfied.
Transfer Media
Twisted-pair line
Load Resistance
100
Ω
Display(Pulse) Nominal Peak Voltage 3.00 V
OPEN END
CLOSED END
X
T
E
T
E
GND
-48 VDC
(C.O.)
Key Telephone
Summary of Contents for OFFICESERV 7100
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