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What is an ADSL Filter, and why do i need one?
ADSL (Asymmetric digital subscriber line) a form of DSL, is a communications technology that allows high speed internet via excising copper telephone lines.
If you have a voice service over the same line, all phones and devices (except the ADSL modem) need to be 'filtered' to block out the noise and interference caused by the ADSL signals, this can be done by inline filters connected to each device, or a central filter to be installed. see below.
An ADSL filer is an analog low pass filter.
Do i need an ADSL Central Filter?
If you have either 2 or more phones connected, have an alarm system that is connected to the phone line or if you have old or poor cabling, you may require or benefit from a central filter to get the best connection and speed.
How does an ADSL Central Filter help?
A properly installed ADSL central filter will filter all exciting socket on that line, this eliminates the need for 'inline' filters to be used on every phone connected, the less filters the better, a new cable is then run from the central filter to a dedicated socket for the modem providing the best possible connection, this would usually be the only unfiltered socket. |
A C10 100E ADSL Central Filter |
Why the C10 100E / 100P Central Filter?
Because its the best we have used!
We have tested a wide range of central filters, from well know brands to some very cheap models and the C10 100E / 100P has out performed all of them, being internet speed or life span.
The C10 100E is high quality filter suitable for ADSL, ADSL2 and ADSL2+, it is used by Telstra and had a Telstra part number on it and it is the ONLY filter Telstra allows a cabler to install in there lead in cable before the network boundary.
The C10 100E / 100P is in the higher price range for central filters, but you get what you pay for.
What is a 'Naked' DSL?
Naked DSL is ADSL2+ internet service on a phone line (copper pair cable) without having a (PSTN) voice service and without having to pay phone line rental costs. Naked DSL may be available if you currently have a phone line (copper pair back to the phone exchange) and the exchange is equipped with adsl2+
Naked DSL is not available to customers on pair gain or RIM equipment (Telstras infrastructure) or if you equipment requiring a PSTN line such as an alarm system, fax machine, eftpos, vending machines ect.
In some cases, the ISP can provide a VOIP phone service allowing you to make and receive voice calls using the internet, and in some cases may be able to transfer your old number over.
The number of ISP's providing Naked DSL is growing, and include, but not limited to, iinet, TPG, iPrimus, dodo.
What is a 'Mode 3' socket?
For an alarm to function properly, the phone socket should be wired as a 'Mode 3' style, were the incoming phone line goes direct to the alarm, it then returns out of the alarm to all the phone sockets around the premises, this way if a phone is off hook or in use and the alarm needs to send urgent alarm signals to the control room via the phone line, it will seize the line, disconnecting all the sockets around the premises, allowing it to dial and send signals, once sent it will then return the line to all the sockets.
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New Krone 'modular' style Mode 3 Socket on a Telstra marked Krone wall plate. This style Mode3 socket is identifiable by being the color BLUE |
Older style Mode 3 socket, also called a 611 socket. This style Mode 3 socket is identifiable by the two half circles near the cover screw. |
Why is a Central Filter required if i have a monitored alarm system?
If you have ADSL internet over the phone line, all phones are required to be filtered, this includes the alarm system in order for it to function correctly, the alarms phone line should be configured as a 'Mode 3' connection. (Refer to 'What is a 'Mode 3' socket?' above) If it is a Mode 3 connection, if you filter the alarm, you will filter ALL sockets after the alarm, this will prevent the modem from working in any socket.
If a central filter is installed, a new cable can be run from the filter to a new dedicated wall plate and socket for the modem that will be un filtered.
Telstra have connected and tagged my service to the MDF, what does this mean?
For commercial, apartment blocks, retail and some other locations, the Telstra lead-in cable to your property or building may have an MDF. (Telecommunications Main Distribution Frame) The MDF is Telstras Network Boundary. In many cases Telstras responsibility is only to connect the new service or fix a fault up to the MDF, beyond the MDF is the customers responsibility and will require the customer to arrange a Telecommunications Registered Cabler to connect it past the MDF.
If a new service is being connected, Telstra (or its contractors) will connect to, and test at the MDF, they may 'tag' the pair for identification by the cabler which will connect it to the cable or pair that will go to the required outlet.
DEFINITIONS
| AC Power |
Alternating Current, may refer to mains power in a home, 240 Volts AC, or commercial 3 phase may be 415Volts AC. Using a transformer the mains power can be lowered to lower voltage say 18Volts AC which most alarm systems run on, or even to DC current. |
| ACMA |
Australian Communications and Media Authority |
| ADSL |
Asymmetric Digital Subscriber Line — a form of DSL that has different upstream and downstream data transfer rates. The original form of ADSL is sometimes referred to as ADSL1. Faster versions are ADSL2 and ADSL2+. |
| Aerial cabling |
cabling that is suspended between poles, buildings or other
supporting structures external to a building. |
| AS/NZS |
Australian / New Zealand Standard |
| Carrier |
In telecommunications, a carrier the company that provides the infrastructure, ie Telstra or Optus |
| Central Filter |
A filter designed to split voice and ADSL signals, to filter ADSL from all phone outlets and send ADSL signal to an outlet for the modem |
| Conduit |
Plastic or metal pipe or tube used to cover and protect cables |
| Customer cabling |
Cabling connected on the customer's side of the Telecommunications network boundary |
| DSL |
See ADSL |
| Duct |
A closed passage for housing and protecting cables and conductors, typically square plastic with removable lid. |
| First socket |
A socket within a building that terminates a carriers (usually Telstra) lead-in cable, in many cases this may be the Network Boundary |
| FTA TV |
Free-To-Air Television, television broadcasts freely available to the public without the need to pay a subscription fee to any service provider |
| Lead-in cable |
A carriers (usually Telstra) cabling from the last distribution joint (typically in the street) and the network boundary in the customer's premises. |
| ISP |
Internet Service Provider, as the name suggests, a company that offers internet service access, this may be via DSL over a copper pair phone line, coax cable or wireless. |
| MDF |
Main Distribution Frame, a distributor that provides an electrical termination point for a carrier’s lead-in cabling. This becomes the Network Boundary |
| Mode 3 |
A wiring arrangement that allows a device such as an intruder or fire alarm to seize the line and dial out, disconnecting all other sockets on the line, allowing to use the line even if a phone or device is 'in use off hook' (see above for more info) |
| Naked DSL |
See full description top half of page |
| Network Boundary |
The point that is deemed by legislation to be the boundary of a carrier’s (Telstra for instance) telecommunications network. This is usually a termination point for the carrier’s lead-in cabling and may be an MDF, an NTD or first socket |
| NTD |
Network Termination Device, a device provided by a carrier to establish a demarcation point between the carrier’s telecommunications network and customer cabling or customer equipment. The NTD is usually a plastic enclosure on an external wall and will be permanently marked at manufacture with the words “Network Termination Device” or the letters “NTD” |
| PIR |
Passive Infra-Red, a form of motion sensor used for alarm systems, that measures infrared (IR) light radiating from objects in its field of view, motion is detected when an infrared source with one temperature, such as a human, passes in front of an infrared source with another temperature, such as a wall |
| POTS |
Plain Old Telephone System, a traditional voice service by a carrier |
| PSTN |
Public Switched Telephone Network |
| Reed Switch |
An electrical switch, consisting of a pair of contacts on ferrous metal reeds in a hermetically sealed glass tube, the switch will open or close when a magnet is in close proximity. For alarm systems they are typically mounted on doors or windows. |
| REN |
Ringer Equivalence Number is a number given to a telecommunications equipment that denoted the electrical load the phone ringer puts on the line. Most phones and equipment have a REN of 1, some powered devices such as cordless phones may have a REN of 0.1 To ensure normal operation, Telstra suggests the total of of phones and equipment on the line, including modems and alarm system, to not exceed a total REN of 3. |
| VOIP |
Voice Over Internet Protocol, is a service allowing voice calls over an internet connection, requires special VOIP phones |
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