# US 8,542,994 B2 · PON system and terminal operation registering method

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- Number: US 8,542,994 B2
- Document ID: US8542994B2
- Status: Granted
- Kind: B2
- Application number: 13/732,076
- Filed: 2012-12-31
- Published: 2013-05-16
- Granted: 2013-09-24
- Earliest claimed: 2006-03-06
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Sumitomo Electric Industries, Ltd.
- Inventors: Hiroshi Murata
- Web page: https://patentgrep.com/patent/US8542994B2

## CPC

- H04B 10/27: Arrangements for networking
- H04J 3/1694: {Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers (Passive Optical Networks H04Q11/0062)}
- H04J 14/02: Wavelength-division multiplex systems
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)

## Abstract

In a PON system in which communication is performed at a plurality of types of transmission rate (L, M, and H) in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, within a discovery period for allowing an unregistered terminal to be recognized by station apparatus, the terminal makes a discovery response at one type of transmission rate (L). With this configuration, station apparatus can wait for a discovery response with a receive function being allowed to support transmission rate (L).

## Claims

### Claim 1

A device for a passive optical network system in which communication is performed at a plurality of types of transmission rate in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, the device comprising:
a receiver for receiving a discovery gate message transmitted by the station apparatus; and
a transmitter for transmitting a discovery response, wherein:
within a discovery period for allowing an unregistered terminal to be recognized by the station apparatus, the transmitter is configured to make the discovery response at a limited predetermined transmission rate among the plurality of types of transmission rate, and
the predetermined transmission rate is specified by the station apparatus.

### Claim 2 (depends on 1)

The device according to claim 1, wherein the predetermined transmission rate is of one type and when the device is unregistered, and the transmitter is configured to make the discovery response using the transmission rate within the discovery period.

### Claim 3 (depends on 1)

The device according to claim 1, wherein when the device is unregistered, the transmitter is configured to make the discovery response within a discovery period corresponding to a transmission rate used by the unregistered device.

### Claim 4 (depends on 1)

The device according to claim 1, wherein when an unregistered terminal receives from the station apparatus a signal for starting a discovery process at a plurality of types of wavelength having one-to-one correspondence with the transmission rates, the unregistered terminal makes a discovery response at a transmission rate used by the unregistered terminal.