Mail separator
A mail separator ( PTrE ) is a component of the " line technology " of a telephone network and was installed by the Deutsche Bundespost until the end device market was liberalized (July 1, 1990).
Usage
The mail separator was prescribed in the terminal line between APL and the trunk connections of private private branch exchanges to delimit the postal network and the responsibility of the private maintenance company. Plugging in the isolating plug to connect a private telephone system to the postal network for the first time was officially reserved for the inspection officers of the Federal Post Office. The PTrE was not required in postal and participant-owned telephone systems. However, it was installed there occasionally. The legal basis was regulated in the Telecommunications Ordinance § 28.
Versions / types
The PTrE is available as a separating strip (Trle) with 10 twin wires for direct installation in telecommunication distributors and as a surface-mounted version for 2, 4 or 10 twin wires. There are two isolating plugs for each pair of wires to cut the connection for measuring and testing purposes. The cable cores are connected using screw terminals. The use of the existing soldering lugs was less common.
Type overview
PTrE to 2 pairs
PTrE to 4 pairs
PTrE to 10 pairs (without cover)
labeling
In the case of the mail separators with 4 and 10 pairs, the incoming lines are labeled. There is also a labeling strip above the screw terminals and / or a paper sticker in the housing cover, on which exchange lines, fixed connections, etc. can be named. The abbreviation LSZ stands for line code number. At the Bundespost and also at today's Deutsche Telekom AG, each type of connection and fixed connection has a specific line code number.
Labeling card of a PTrE
Individual proof
- ↑ Handbook of Telecommunications Technology, Volume 7, Part 2, Line Technology, as of spring 1980, p. 125.