Comba Telecom SR-1910 Installation Manual page 28

Wireline Modem
For the equipment variant equipped with wireline modem, the modem provides the link for data and alarm
code. The following figure shows the diagram of the wireline modem.
RS232 and VDC Input ports are pre-wired to the equipment. The following table provides the definitions of
the main ports on the modem.
1
To Line
To Telephone
RS232 Port
VDC Input
On the modem, there are five status LEDs colored in red. Shown below are the definitions of these LEDs.
CD (Carrier detect)
TR (Data Terminal Ready)
RD (Receive Data)
TD (Transmit Data)
Power
1
Comba does NOT provide the RJ-11 cable. So the connection of the wireline modem to the PSTN network is outside the scope of
this document.
SR-1910 QI
ENU Status : 1-1-1
INSTALLATION GUIDE FOR SR-1910
Figure 13: Diagram of wireline modem
Connects the modem to the Public Switched Telephone Network (PSTN)
by using an RJ-11 cable.
Connects to a telephone directly by using an RJ-11 cable (optional).
It is a 'DB9' port, which connects to the DB9 port on the distribution board.
Connects to 10 - 30 VDC supply.
Table 5: Wireline modem connectors
The modem has detected a carrier on the phone line (a remote modem
has been detected).
The PC (or SIXNET Station) has established a connection to the modem
and is ready for transmission.
Flashes as data is received from the phone line.
Flashes as data is sent out the phone line.
ON when power is present.
Table 6: Wireline status LEDs
End of section
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Page 28