公开(公告)号：DE3069082D1

公开(公告)日：1984-10-04

申请号：DE3069082

申请日：1980-11-28

Applicant: IBM ,  IBM FRANCE

Inventor： CHOLAT-NAMY JEAN ,  HUON SIMON ,  THIRION PHILIPPE

IPC: H04L5/22 ,  H04J3/14 ,  H04L69/40 ,  H04L11/12

Abstract: 1. A multiport modem of the type comprising several input/output interfaces (7A-7D) that may respectively receive the bits of several data sub channels, multiplexing means (42, 45-46, 56) for multiplexing together the data bits received through those of the interfaces which are active to form a single train of bits in accordance with a multiplexing configuration, and transmitter means (75) for sending said train of bits over a transmission channel, characterized in that it includes : means (36) for detecting a test request received from one of the interfaces, means (30) responsive to a test request to generate a test configuration code identifying the interface that supplied said test request, means (11) responsive to said test configuration code to cause said multiplexing means to assume a test configuration such that only that interface which received the detected test request will be active, storage means (73) for storing a test command received at the interface that received the test request, said command including an indication of the test to be performed and a link level identifier, decoder means (74) for decoding said link level identifier, and means (67, 73) for applying the received test command and the test configuration code to said transmitter means for transmission over said channel if said link level identifier indicates a link level other than that which includes the modem.

公开(公告)号：FR2335109A1

公开(公告)日：1977-07-08

申请号：FR7538562

申请日：1975-12-09

Applicant: IBM FRANCE

Inventor： THIRION PHILIPPE

IPC: H04L27/38 ,  H04L27/00 ,  H04L27/22 ,  H04L27/233

Abstract: A statistical data detection method for use in a synchronous data transmission system employing either phase modulation, combined amplitude and phase modulation or quadrature amplitude modulation. The signal space diagram of the possible states of the transmitted signal and their influence zones is divided into N elementary squares. Since the squares are rather coarse to save storage space, many such squares belong to more than one influence zone. The influence zone of a state Z defines the region within which the received signal, P, will lie when state Z has been transmitted.

公开(公告)号：FR2413712A1

公开(公告)日：1979-07-27

申请号：FR7739966

申请日：1977-12-30

Applicant: IBM FRANCE

Inventor： EPENOY GABRIEL ,  KUHNE ROLAND ,  LAURENT BERNARD ,  THIRION PHILIPPE

IPC: G06F7/53 ,  G06F7/48 ,  G06F7/506 ,  G06F7/508 ,  G06F7/527 ,  G06F7/533 ,  G06F7/544 ,  G06F17/16 ,  G06F7/38

Abstract: A specialized processor capable of computing a sum of products S= SIGMA +/-Pi where every product Pi is the product of two n-bit complex operands Ai+j Bi, the multiplier, and Ci+j Di, the multiplicand, where j= 2ROOT -1. The processor includes an instruction storage, means for decoding instructions read out of said storage and for controlling the operation of the processor, a data storage, and a multiplication and accumulation unit which has two multiplier-accumulator devices and several buffers for storing the operands Ai, Bi, Ci and Di sequentially read out of data storage. The real part Ai and the imaginary part Bi of the multiplier are respectively applied to the Multiplier inputs of the multiplier-accumulator devices and the real part Ci of the multiplicand is applied to the Multiplicand inputs of the multiplier-accumulator devices, which simultaneously compute the products Ai Ci and Bi Ci. The imaginary part Di of the multiplicand is then applied to the Multiplicand inputs of the multiplier-accumulator devices. The first of these then computes the product Bi Di and adds the same to the product Ai Ci, while the second device computes the product Ai Di and adds the same to the product Bi Ci to simultaneously provide the real and imaginary parts of the product Pi.