Pulse transmission device for use in long-distance communication

• US 6,532,260 B2
• Filed: 10/26/1999
• Issued: 03/11/2003
• Est. Priority Date: 04/19/1999
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Oi, Masakazu
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Ha, Dac V.
• Application Number:
  US09/426,487
• Publication Number:
  US 20020176493A1
• Time in Patent Office: 1,232 Days
• Field of Search: 375/219, 375/222, 375/238, 375/256, 375/257, 375/295, 375/296, 370/205, 370/212, 370/213, 327/31, 327/291, 329/311, 329/312, 329/313, 332/106, 332/107, 332/109, 332/112, 332/115
• US Class Current: 375/238
• CPC Class Codes: H04L 25/0266 Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling
• CPC Class Codes: H04L 25/03834 using pulse shaping
• CPC Class Codes: H04L 25/03878 Line equalisers; line build-out devices

Abstract

A device for transmitting a pulse signal via a metallic line to a receiver end at which equalization is applied to the received pulse signal. The device includes a waveform adjustment unit which adjusts a pulse width in accordance with differences between characteristics of the metallic line and characteristics that are assumed for the equalization at the receiver end. The device further includes a transmission driver unit which transmits a pulse having the adjusted pulse width to the metallic line.

Claims

1. A device for transmitting a pulse signal via a metallic line to a receiver end at which equalization is applied to the received pulse signal, comprising:

a waveform adjustment unit which adjusts a pulse width of the pulse signal transmitted via the metallic line by selecting the pulse width without feedback control in accordance with differences between characteristics of the metallic line actually used and characteristics that are assumed for the equalization at the receiver end; and

a transmission driver unit which transmits a pulse having the adjusted pulse width adjusted by said waveform adjustment unit to the metallic line.

2. The device as claimed in claim 1, wherein said waveform adjustment unit adjusts the pulse width such that a pulse obtained at the receiver end by applying the equalization to the pulse having the adjusted pulse width and having passed through the metallic line has a predetermined pulse width.

3. The device as claimed in claim 1, further includes an amplifier unit which amplifies the pulse having the adjusted pulse width prior to the transmission to the metallic line.

4. The device as claimed in claim 1, wherein said transmission driver unit adjusts a transmission level at which the pulse having the adjusted pulse width is transmitted to the metallic line.

5. The device as claimed in claim 4, wherein the transmission level is adjusted in response to the adjusted pulse width such as to achieve a constant transmission power regardless of the adjusted pulse width.

6. A device for transmitting a pulse signal via a metallic line to a receiver end at which equalization is applied to the received pulse signal, comprising:

a waveform adjustment unit which adjusts a pulse width of the pulse signal transmitted via the metallic line in accordance with differences between characteristics of the metallic line in accordance with differences between characteristics that are assumed for the equalization at the receiver end;

a transmission driver unit which transmits a pulse having the adjusted pulse width adjusted by said waveform adjustment unit to the metallic line,

wherein said transmission driver unit adjusts a transmission level at which the pulse having the adjusted pulse width is transmitted to the metallic line; and

the device as claimed 4, further comprising

A memory unit which stores data of different combinations between a pulse width and a transmission level, wherein the data of a selected one of the combinations is supplied to said transmission driver unit to transmit a pulse having such a pulse width and a transmission level as specified in the supplied data, the selected one of the combinations being successively changed until the device receives from the receiver end a synchronization establishment notice indicating an establishment of synchronization for the received pulse signal of the receiver end.

7. The device as claimed in claim 6, wherein the selected one of the combinations is latched when the synchronization establishment notice is received.

8. A device for transmitting a pulse signal via a metallic line to a receiver end at which equalization based on assumed characteristics of the metallic line is applied, comprising:

a waveform adjustment unit which adjusts a pulse width of the pulse signal transmitted via the metallic line by selecting the pulse width without feedback control such as to compensate for differences between characteristics of the metallic line actually used and the assumed characteristics; and

a transmission driver unit which transmits a pulse having the adjusted pulse width adjusted by said waveform adjustment unit to the metallic line.

9. A device for transmitting a pulse signal via a metallic line, wherein equalization is applied at a receiver end of the metallic line, comprising:

a waveform adjustment unit which adjusts a pulse width of the pulse signal transmitted via the metallic line by selecting the pulse width without feedback control from the metallic line; and

a transmission driver unit which transmits a pulse having the adjusted pulse width adjusted by said waveform adjustment unit to the metallic line, wherein the adjusted pulse width is such that a pulse obtained at the receiver end by applying the equalization to the pulse having the adjusted pulse width and having passed through the metallic line has a predetermined pulse width.