GENERAL
INSTALLATION
MODEM
PC & SOFTWARE
FAULT FINDING
CONNECTORS & CABLES
|
MULTIPLE PHONE SOCKETS - MODEM CLOSE TO MASTER SOCKET
OR ENTRY POINT
Wiring Modifications |
In general terms, the existing wiring should be modified to achieve the
following:
- To connect the modem DSL port to the incoming telephone line (DSL),
via twisted-pair cable.
- To connect the modem Phone port to the premises Master Socket, and
thence to any extension sockets.
|
Modem Adjacent to Entry Point or Master Socket |
If the required modem location is adjacent to the entry point of the
customer’s telephone line, or the Master Socket, the line should be
broken at this point, enabling direct connection of the incoming DSL to
the modem. The existing house wiring, extending from this point, should
now be connected to the derived Phone service from the modem.
If there is a junction box at this point, it should be replaced with
the correct type of socket, to match the supplied DSL/Phone cable. The cable
connects to the RJ-45 socket of the modem and has two twisted pairs, to
carry both the DSL and derived Phone circuits.
A typical installation is shown below. The same principals apply,
whatever type of socket is used.
|
RJ-11 Master Socket |
The diagram below shows how to modify the wiring of an RJ-11 type
master socket.
|
|
Originally, the house wiring for telephones was connected to pins 3 and
4 of the RJ-11 socket, together with the telephone line from the exchange.
The house wiring pair must now be moved to pins 2 and 5 of the socket, so
that they can be connected to the Phone output of the Modem, via the
combined DSL and Phone cable.
|
Phone Wiring |
The phone output of the IDSL MODEM can usually be connected to the
existing customer premises phone wiring, without further modification.
Caution: External wiring, which might be subject to high voltage surges
must not be connected to the IDSL MODEM Phone port.
|
Modem Connections |
All connections to the IDSL MODEM are made via sockets on the back
panel.
- Connect the RJ-45 (DSL / Telephony combined port) to the wall
mounted (country specific) socket using the cable provided.
- Connect the female DB9 connector (RS-232 interface, V.24 data port)
to the serial port (COM port) of the PC, using the supplied cable.
- Connect a desk phone to the RJ-11 socket, if required.
- Connect the low voltage dc output of the mains adapter to the 2.5mm
power socket (centre positive).
|

MODEM CONNECTION SCHEMATIC
Maintenance of Telephone Service During Installation |
If the modem is installed prior to the LT (its companion exchange
equipment) but not powered up, metallic bypass circuits will preserve the
connection from the telephone to the incoming line. |
Interruption
of Telephone Service |
As a result of modifications
to the house wiring, telephone service will only be available when the
Modem is connected to the Master Socket. |
Multiple Telephones |
Multiple telephones may be included in the Phone circuit, but cordless
phones should be at least 3m from the modem.
As with conventional copper circuits, transmission performance may be
impaired if more than one telephone is off-hook at the same time.
|
Earthing (Grounding) |
The IDSL MODEM is designed to operate without a local earth connection.
Do not earth the IDSL MODEM.
|
Mains Power |
The modem must be powered from the local mains, using the supplied plug-pack adapter. The mains outlet should not be shared by other equipment,
which might generate mains-born RF interference. This would include such
equipment as TV sets, microwave ovens, Ham Radio transceivers etc.
|
Market Specific Power Adapter |
Check that the power adapter supplied with the IDSL MODEM is correctly
rated for the voltage and frequency of the local mains supply.
Use of a non-approved power supply will negate the equipment
warranty.
|
top
|