 Flexible module interconnect system |
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| High-density erasable programmable logic device architecture using multiplexer interconnections |
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| PLD with selective inputs from local and global conductors |
| It is an object of the present invention to provide an improved PLD integrated circuit that ... |
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| Programmable logic array with local and global conductors |
| These and other objects of the invention are accomplished in accordance with the principles of the ... |
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| Valid flag for disabling allocation of accelerated graphics port memory space |
| The above and other objects of the present invention are satisfied, at least in part, by providing ... |
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| Address translation unit supporting variable page sizes |
| It is, therefore, an object of the present invention to provide an address translation unit which ... |
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| Four quadrant multiplying divider using three log circuits |
| OF THE INVENTION Referring to the figures and more particularly FIG. 1 (prior art), the circuitry ... |
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| Method and apparatus for electro-optically convoluting a one-dimensional signal |
| The problem of the prior art is eliminated by a method and apparatus for convoluting a signal ... |
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| Exponential operation device |
| To attain the above-mentioned object, an exponential operation device according to the invention ... |
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| Hardware arrangement for floating-point addition and subtraction |
| It is an object of this invention to provide a hardware arrangement for floating-point addition by ... |
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Network interface unit
| Details |
Inventors: DeBalko, George A.; Dellinger, Thomas A.; Hughes, Philip;
Assignee: Siecor Corporation (Hickory, NC); AT&T Bell Laboratories (Murray Hill, NJ)
Primary Examiner: Abrams; Neil
Assistant Examiner:
Attorney, Agent or Firm: Birnbaum; Lester H.
Disclosed is a network interface unit which includes customer bridges and an array of circuits such as maintenance termination units (MTUs). The MTUs are provided on printed circuit boards, each including a male and female connector. Each board is inserted in between posts in the unit housing so that the female connectors plug into a mother board at the bottom. Jack wires are plugged into the male connectors and extend to the customer bridge portion of the unit. |
|
DETAILED DESCRIPTION FIG.
1 illustrates a portion of the apparatus according to the invention.
The unit includes a housing, 10, with a top portion 11 and a bottom portion 12.
A cover, 13, is attached to the top portion by means of hinges 14 and 15.
Mounted above the bottom portion of the housing are two rows of terminals, e.
g.
, 16 and 17.
Each pair of adjacent terminals (e.
g.
, 16 and 17) in the two rows constitutes a customer bridge which can be coupled to customer equipment by means of standard wire pairs (not shown).
Each terminal pair is typically formed in a plastic sleeve which press fits into holes formed on the top portion, 11, of the housing 10.
Pairs of wires are coupled to each terminal pair and protected by a jacket (e.
g.
, 18).
The wires terminate in a standard RJ11 jack plug (e.
g.
, 19) which is removably inserted into a jack (e.
g.
, 20) in the surface of the top portion (11) of housing 10 which is adjacent to the terminal pair.
As described in more detail below, each jack is electrically coupled to the telecommunications network.
Thus, each customer bridge may be decoupled from the network by removing its associated plug from the jack.
FIG.
2 illustrates a portion of the apparatus of FIG.
1 with the top portion (11) of the housing, along with the customer bridges and jack plugs, opened up to reveal the contents of the bottom portion 12 of the housing.
The top portion (11) is mounted to the bottom portion by means of hinges 21 and 22 so that the top portion can be swung open in a manner similar to cover 13 but in an opposite direction.
At the floor of portion 12 is mounted a printed circuit mother board 30 which extends essentially the full length of the portion 12.
The mother board is typically mounted by screwing the board into the floor.
Also extending from the floor of portion 12 are two rows of posts, e.
g.
, 31 and 32, adjacent to opposite sides of the mother board.
Each row of posts can be molded plastic pieces which are integral with the floor and possibly with one or more side walls of bottom portion 12
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CPUs 
