Managed HDSL repeater
First Claim
1. An arrangement in a High speed Digital Subscriber Line (HDSL) communication system for fault isolation, comprising:
- a line terminal, for transmitting a signal and for monitoring an embedded overhead channel between the line terminal and a network terminal that receives the signal;
the overhead channel for managing fault isolation between the line terminal and the network terminal; and
a passive repeater, coupled to the overhead channel between the line terminal and the network terminal, for receiving and amplifying the signal from the line terminal and forwarding the amplified signal to the network, wherein an origin bit in the embedded overhead channel is set for upstream direction or downstream direction and an upstream origin bit detected at the line terminal having a different value from the set value indicates a loop.
1 Assignment
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Accused Products
Abstract
A repeater for HDSL transmission is presented. The repeater replaces the regenerator commonly used in HDSL by utilizing the activation/deactivation process in the HDSL specification. The repeater is adjusted to detect an activation/deactivation sequence, whereby a flip-flop in the repeater is alternated. A first state of the flip-flop allows transmission passing through the repeater to the terminating point, e.g. a network terminal, and a second state loops transmission back to the originating point, e.g. a line terminal. The looping may then be utilized for maintenance and error detection and recovery. By use of one of the free bit in the overhead channel in the HDSL transmission as an origin bit, wherein “1” is set in the upstream direction, and “0” is set in the downstream direction, it is possible to detect at the line terminal whether there is a loop in the repeater.
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Citations
10 Claims
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1. An arrangement in a High speed Digital Subscriber Line (HDSL) communication system for fault isolation, comprising:
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a line terminal, for transmitting a signal and for monitoring an embedded overhead channel between the line terminal and a network terminal that receives the signal; the overhead channel for managing fault isolation between the line terminal and the network terminal; and a passive repeater, coupled to the overhead channel between the line terminal and the network terminal, for receiving and amplifying the signal from the line terminal and forwarding the amplified signal to the network, wherein an origin bit in the embedded overhead channel is set for upstream direction or downstream direction and an upstream origin bit detected at the line terminal having a different value from the set value indicates a loop. - View Dependent Claims (2, 3, 4, 5)
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6. A method of fault isolation on High speed Digital Subscriber Line (HDSL) communication system, comprising the steps of:
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monitoring an embedded operational channel (EOC) connected between a line terminal and a network terminal; utilizing a passive repeater connected between the line terminal and the network terminal, wherein the passive repeater amplifies a signal from the line terminal and forwards the amplified signal to the network terminal; and detecting an origin bit in the EOC at the line terminal, wherein a value of the origin bit indicates a loop in the passive repeater. - View Dependent Claims (7, 8, 9, 10)
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Specification