Junction box
A connector socket ( VDo ) or the flatter, plug- compatible connector socket ( SvDo ) are telephone sockets that were installed by the Deutsche Bundespost from around 1963 until the introduction of the TAE socket in 1987. They are used for the permanent connection of telephones and are occasionally still to be found on main lines. The main difference to the TAE plug-in connection system is that with the junction box, the connection can only be established or released when the lid of the socket is unscrewed. The TAE system replaced the VDo system as well as the ADo system.
use
Junction and plug connector sockets were mainly used by the Bundespost in private households. The can lids were designed so that the screws were set in a recess. After the telephone was connected, a seal was inserted into this, which could only be removed by destroying it. This enabled the Deutsche Bundespost to recognize attempts to manipulate the telephone connection.
predecessor
From around 1948 until the introduction of the connector box system, the Deutsche Post used black or white "junction boxes" made of Bakelite in the western occupation zones (from 1950 Deutsche Bundespost ) to connect dialing devices. These were available as surface or flush-mounted sockets, with the lead wires screwed on.
With the designation "W 32" (four-pole) and "W 35" (six-pole) there are two different surface-mounted terminal boxes. Both have two small plugs on the inside that can be pulled out for testing purposes, interrupting the connection La and / or Lb. The five-pin "W 33" and the five-pin junction box "W 34" are available as flush-mounted junction boxes.
The "W 34" is not a junction box, but serves to accommodate a " roller plug " and is therefore a junction box. From around 1960, the "W 34" was called the "ADo ZB 50" .
These junction boxes were mainly used to connect the W 48 dialer , but also for the 36 , the W 38 or a drum selector .
Terminal box W 33 and
W 32
Terminal box W 33 and W 32, bottom
Terminal box W 33 and
W 32 from the inside
VDo 4
By the end of the 1980s, the Deutsche Bundespost provided telephones with connecting cables to four-pin plug connections, the AS-4 plugs, and the corresponding junction boxes (VDo 4). For the " double connection " that emerged in the 1980s , in which two telephone connections were made available for a reduced basic fee, there was the corresponding double socket VDo 4/4 that could accommodate two connection cables.
VDo 4 surface-mounted (left), VDo 4/4 surface-mounted (right, for two telephones)
VDo 4/4 flush-mounted (for two telephones)
VDo 4 concealed without cover
Connection plugs AS-7 and AS-4
VDo 4
| Terminal assignment |
Surname | meaning | Color of the wire (with control circuit) | ||
|---|---|---|---|---|---|
| plug assignment |
Dose *) ( " Telecom Cables") |
Socket *) (standard cable) |
|||
| 1 | a | Line "a" of the ab interface of the subscriber line | 1 white | red without ring | red |
| 2 | b | Line "b" of the ab interface of the subscriber line | 2 brown | red with a single ring (ring spacing 17 mm) | black |
| 3 | W. | Second alarm clock or ringer second device | 3 green | ||
| 4th | E. | " Earth " for extension and DEV | 4 yellow | ||
VDo 7
For special devices, such as the FeTAp 613 for an A2 circuit , which is used to operate two telephones on one subscriber line, there is also the 7-pole variant VDo 7. The additional three poles connect the second telephone with the Special apparatus.
7-pin double sockets (VDo 7/7) and 9-pin special types were also used in the private sector.
Surface-mounted connection box VDo 7, right with insulation displacement terminals
Flush-mounted junction box ADo 7
Flush-mounted junction box ADo 7 from inside
VDo 7
| Terminal assignment |
Surname | meaning | Color of the wire (with control circuit) | ||
|---|---|---|---|---|---|
| plug assignment |
Dose *) ( " Telecom Cables") |
Socket *) (standard cable) |
|||
| 1 | a2 | Line "a" is looped through the device | 1 white | red with double ring (ring spacing 34 mm) | White |
| 2 | b2 | Line "b" is looped through the device | 2 brown | red with double ring (ring spacing 17 mm) | yellow |
| 3 | a | Line "a" of the ab interface of the subscriber line | 3 green | red without ring | red |
| 4th | b | Line "b" of the ab interface of the subscriber line | 4 yellow | red with a single ring (ring spacing 17 mm) | black |
| 5 | W. | Alarm clock of the second telephone, second alarm clock or ringer second device | 5 gray | ||
| 6th | E. | " Earth " for extension and DEV | 6 blue | ||
| 7th | G | External billing meter | 7 red | ||
*) The wire colors used when wiring junction boxes depend on the cables laid and the wires that can be used in them.
Adapter to "1. TAE "
Since 1987 the TAE has been used as a connection unit in the network of the Deutsche Bundespost and later at Deutsche Telekom AG (in preparation for the liberalization of the terminal equipment market on July 1, 1989). From 1994, Telekom offered free adapters to convert existing junction boxes (SvDo or VDo) to the 1st TAE (including passive test termination ).
literature
ZVEI , BITKOM (ed.): Forum 10 - Installation of telecommunications terminal equipment. (PDF; 2.2 MB) 6th edition, ZVEI, Frankfurt / Main and BITKOM, Berlin, May 2011
Web links
Individual evidence
- ↑ Tel-Da GmbH, Viernheim: Catalog 1983 (PDF, 4 MB) ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
