Outside (CO) line board is take on connect with PSTN,
various CO line signal can transmit to each extension
port by tone exchange system that in CO line board to
realize communicating between CO line and Extension.
Allowed maximum install two pieces of CO line board,
and have 8 CO line ports in each CO line card, maximum
have 16 CO lines.
The port order of No.1 CO line board are 01~08 from the
bottom up; the No.2 CO line board are 09~16 from the
bottom up.
The line will priority enter the idle lower CO line port
when internal extension make the external call.
To reduce the CO lines are occupied by the outgoing
calls, we suggest to connect the high-frequency used
CO lines that for external call incoming to the higher
CO line port
Arrester is a device to be installed on outside (CO) line
to prevent a damaging from thunder. We recommend
to install arrester. In addition, grounding (connection to
earth ground) is very important to protect the system.
(Thunder damaging is void warranty)
Extension board is connecting with internal telephone,
the system can build internal communication or external
call by tone exchange system.
Maximum allowed connect with sixteen extension cards,
have 8 extension ports in each board, total have 128
extensions. The port order of each extension board is
increased from the bottom up, The No.1 card are 01~08,
the No.2 board are 09~16 from the bottom up, thus
analogically.
We are recommend to installed the arrester for extension
lines when the extension lines are expose at outdoor.
3
CO line board
4
Extension board
No.1
CO line board
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
No.2
CO line board
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
No.2
Extension board
No.1
Extension board
10
Section 1 Basic System Construction
