TAE connector

The telecommunication connection unit ( TAE) is a used in Germany and partly in Liechtenstein and Luxembourg socket for analog telephone lines (a / b interface ) and ISDN lines to connect the NT to the connecting line. TAE also be used in private branch exchanges.

Type NFF without lid

TAE plug

The TAE was introduced in Germany in 1987 in preparation for the post- reform and the liberalization of the terminal market in 1990. Since it is possible for the user and allows you to connect approved phones and accessories ( answering machine, fax, modem ) itself. Precursor was the connector box ( VDo, SVDO ) with a fixed telephone line. For accessories, a junction box ( ADo ) was retrofitted as a pluggable connector.

First TAE as network termination

The so-called " 1 TAE "is the first junction box (from the perspective of the network operator ) in the premises of the participant and carries out special tasks. It contains an invisible passive Inspection (PPA ) for measurement purposes and serves as a network termination. Therefore, they may not be replaced by a normal telephone socket or a DSL splitter.

The first is a special TAE NFN socket (on - or flush-mounted ) with the inscription " 1 " and a typical beaded design. The connection is made with insulation displacement technology ( LSA). By mid- 1994, as first TAE standard doses mounted, clamped to the passive Inspection ( under the lid visible) and a telecom stickers were attached.

Occupancy

TAE doses are 6 -pin and (more rarely) produced 4-pin. In the 4- pole version, terminals 3 and 4 (W- wire and ground ) saved because they are unnecessary in today's devices. The plug connections are compatible.

In the national ISDN ( 1TR6 ) Deutsche Telekom ( installed until 1994) 8-pin TAE doses were used for the S0 bus. An ISDN telephone with 8-pin TAE plug is not working in today's Euro -ISDN.

*) The wire colors in the wiring of TAE doses depends on the installed cables and wire pairs used therein. See also telephone cord and telephone line cord.

Coding

TAE plugs and jacks each have either an F or N- encoding.

  • The F stands for telephony, is designed for phones. Also NT or DSL splitter be plugged into the R jack.
  • The encoding N stands for non telephony ( also colloquially slave ) and thus for all devices except phones, and include, for example, voice mail, fax machines, modems and fees Gazette.
  • On telephone systems and terminal adapters are found occasionally U- coded jacks ( " universal" ), into which you can insert either an N- or F connector.
  • E- coded connectors with staggered openings look similar, but have nothing to do with telephone connections. You find yourself at Ethernet jacks (EAD ), which were developed from the TAE system.

Multiple devices on a TAE

Depending on your usage and the appropriate circuit of the terminal messages more connected to a NFN socket devices can either simultaneously, but can be used dependent on each other, or it may at the same time only one device can be used.

Simultaneous use is for example given when connecting an answering machine and a telephone set. The answering machine is looped technically before the telephone. Thus, it is possible to take an adopted by the answering call by lifting the handset; the recording of the call by the answering machine is thereby terminated. It is similar when connecting an answering machine, fax machine and telephone on a NFN socket. Here fax and answering machine are looped in front of the telephone. If the fax machine has a passive splitter and the two messaging terminals are plugged in the correct order, then the reputation of the incoming faxes will indeed answered by the answering machine, the fax signals are received but nevertheless of the fax machine, and the recording by the answering machine does not take place.

Separate use, however, is given to the connection of a modem and a telephone set at an NFN socket. If a plugged into the left N-connector modem activated, for example, it separates the underlying devices from the line, the right N-connector and F connector are then switched off.

Problems arising for the left and middle socket of a NF / F- box; an answering machine ( N female ) can be interrupted by telephone (mean F socket ); a modem ( N female ), the telephone (mean F socket ) off. The right F-female, however, is electrically isolated from the other two jacks independently.

Two devices on a FF can not disturb each other, here are two card slots independently.

Without the contact tongues are inserted plug in the socket together in pairs. Characterized between the terminals 1 and 6, and 2 to 5 electric contact. In this manner, in the common NFN socket, the connection line that arrives first at the left N-female, turned to the right N-connector and from there to the F connector in the middle. The internal wiring of a technical NFN socket so different from the top view.

When inserting a plug into one of the sockets the contact tongues are forced apart by the plug and at the same looped the specific device in the connecting cable. For this to work properly, the connection cable of an N device must be running and connected four wires. The device in question must bridge return direction in the inactive state. Just then another device in a behind -connected socket is connected to the connecting line. This can be remedied as the use of an automatic change-over switch (relay, AMS, formerly AWADo ).

Alternatively, two wire bridges in TAE plug is often used, which continue the interrupted connection cable provided in the connector. This contradicts the meaning of the TAE principle, however, is an increasingly common proceeding.

Modems

On older modems (usually with ZZF / BZT / BAPT approval number), the connection line was bridged in the inactive state by means of a relay. You could hear donning this relay (interrupting the power cord) when dialing of such a device.

With newer modems according to European standard CTR21 approval ( including all built- in notebook ) is saved this relay and they are connected only two poles. For such a modem behind the phone does not switch off as an N device, a special gebrücktes modem cable is required, in which the broken line is bridged by two jumpers in the TAE - N plug. Disadvantage: the parallel-connected devices, such as a phone, it may cause interference or interruptions in the transmission due to the stubs generated thereby. Remedy is an automatic multi- switch ( AMS, T2/T3-Umschalter, formerly AWADO ) or as a last resort to manually limit the modem connection speed on special, usually poorly documented AT configuration commands.

Pros and Cons

Unlike the more common in certain countries, to the RJ -XX connector TAE doses have integral opener, which are composed of two pairs of opposed contact springs. This mechanical switching tasks are possible, the subsequent connecting unit to the mains when not inserted plug.

The normally closed contacts of the N-connectors are the F-connector upstream. The contacts can oxidize or pollute by ingress of moisture, wall color, etc. and cause contact problems ( noise and crackle ) to total failure.

The generally for telephone connections and international standard for ISDN device side, in the U.S., " RJ -XX " connector ( Registered Jack ) ( UAE sockets ) do not have normally closed contacts and offer in this regard, a higher reliability.

Compared to the RJ -XX connector parts of the mechanical connector TAE are made ​​larger.

Some disadvantages can be avoided by using a RJ11 cable, in which only the TAE - end is used as a flexible snap-on adapter in practice. In UAE sockets you can use the ports at existing multiple telephone sockets flexible by each uses a corresponding TAE adapter for fax or phone.

Norms and Standards

The TAE connection is standardized in DIN 41715. However, the contact assignment of the RJ - 11 connector on the other side of the cable is not uniform. Therefore, the TAE connector may have a different pin assignment when the TAE cable not fixed, but is connected via an RJ - 11 connector on the device. Using an incompatible cable may then result in the corresponding operation. Historically, older equipment from Siemens, Telekom and from abroad have different RJ11 assignments. In trade there are matching sets of adapters (see figure), so you no longer have to purchase expensive special cables as before.

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