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  2. Plant test number - Wikipedia

    en.wikipedia.org/wiki/Plant_test_number

    Milliwatt test, a standardized 1004 Hz, zero dBm sinusoidal test tone used to measure line quality and transmission loss between stations. Ringback number, which causes the calling telephone to ring to verify an installation is working and the phone number routing properly. Some localities reserve only 958 or 959. [4] Each country uses ...

  3. British telephone socket - Wikipedia

    en.wikipedia.org/wiki/British_telephone_socket

    A domestic single British telephone line installation will have a single master socket or line box in the premises, which is provided by BT or another service provider: this socket is the demarcation point between the customer-owned and maintained on-premises wiring, and the telephone network.

  4. Digital access carrier system - Wikipedia

    en.wikipedia.org/wiki/Digital_Access_Carrier_System

    The first subscriber's phone (called the 'audio customer') would be connected as normal. The second subscriber (called the 'carrier customer') would have his phone calls modulated on to an RF carrier or Carrier wave on the same physical phone line at around 40 kHz – high enough not to be noticeable to the audio customer.

  5. GPO telephones - Wikipedia

    en.wikipedia.org/wiki/GPO_telephones

    The Tele. 162 Handset Micro Telephone, was the first UK phone to incorporate the transmitter and receiver into a single unit, 'The Handset', which had not been used on telephones in the UK since the very early metal and wood cased models, and the BPO preference for a separate transmitter and Bell receiver, as on the Tele. 150 and Tele. 121.

  6. D-side (UK telephone cabling) - Wikipedia

    en.wikipedia.org/wiki/D-side_(UK_telephone_cabling)

    In a UK telephone line, the term D-side or distribution side refers at any point on a local loop connection between a customer's premises and a telephone exchange to the wires (or pairs of copper wires) leaving into the direction of the customer.

  7. Milliwatt test - Wikipedia

    en.wikipedia.org/wiki/Milliwatt_test

    The test consists of transmitting an analog sinusoidal signal at the frequency of 1004 Hz with the power level of 0 (zero) dBm. By definition, this is the equivalent of a continuous power dissipation of 1 mW ( milliWatt ), i.e., the power consumed if a voltage of 0.775 V ( RMS ) is applied to a telephone line with 600 Ohm nominal impedance.

  8. Network interface device - Wikipedia

    en.wikipedia.org/wiki/Network_interface_device

    This allows the company to test the line from the central telephone exchange, without the need to have test equipment at the customer site. The telephone company usually has the ability to remotely activate loopback, without even needing personnel at the customer site. When looped back, the customer equipment is disconnected from the line.

  9. DSLAM - Wikipedia

    en.wikipedia.org/wiki/DSLAM

    Siemens DSLAM SURPASS hiX 5625 Outdoor Huawei DSLAM fed by GPON lines. A digital subscriber line access multiplexer (DSLAM, often pronounced DEE-slam) is a network device, often located in telephone exchanges, that connects multiple customer digital subscriber line (DSL) interfaces to a high-speed digital communications channel using multiplexing techniques. [1]

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