# US 11,910,136 B2 · Test instruments and methods for emulating optical network terminal (ONT) devices and testing optical networks based on the emulation

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- Number: US 11,910,136 B2
- Document ID: US11910136B2
- Status: Granted
- Kind: B2
- Application number: 17/890,138
- Filed: 2022-08-17
- Published: 2023-03-09
- Granted: 2024-02-20
- Earliest claimed: 2019-09-09
- Assignees: Viavi Solutions Inc.
- Applicants: Viavi Solutions Inc.
- Inventors: Hans Joerg Wolf; Reynald Dupuis
- Web page: https://patentgrep.com/patent/US11910136B2

## CPC

- H04Q 11/0067: {Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring}
- H04B 10/07: Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B 10/073: using an out-of-service signal (H04B10/071 takes precedence)
- H04B 10/0793: {Network aspects, e.g. central monitoring of transmission parameters}
- H04B 10/272: Star-type networks {or tree-type networks}
- H04J 14/0282: {WDM tree architectures}
- H04Q 11/0071: {Provisions for the electrical-optical layer interface}
- H04Q 2011/0079: {Operation or maintenance aspects}
- H04Q 2011/0083: {Testing; Monitoring}
- H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W)
- 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

Disclosed are apparatuses and testing methods for emulating an Optical Network Terminal (ONT) device for communicating or otherwise working with an Optical Line Terminal (OLT) device that was configured to operate with the ONT device. Such emulation may include configuring various settings of the apparatus so that the apparatus may appear to the OLT to be the ONT device. For example, the emulation may include accessing and using authentication/authorization related settings and network configuration settings of the ONT, thus permitting the apparatus to connect to a Passive Optical Network and test services and the quality of service experience without having to reconfigure the OLT.

## Claims

### Claim 1

A portable field-deployable test instrument comprising:
a data storage to store a first Optical Network Terminal (ONT) model of a particular ONT installed at a specific customer premises, wherein the first ONT model includes customized configuration of the particular ONT and customized authentication information of the particular ONT;
a fiber optic interface to connect the test instrument to an optical network at the specific customer premises where the particular ONT is installed;
a controller coupled to the fiber optic interface, wherein the controller is to:
in response to receiving a test flow that indicates one or more service tests to be performed across the optical network, access the data storage to obtain the first ONT model of the particular ONT, including obtaining the customized authentication information of the particular ONT;
emulate the particular ONT installed at the specific customer premises by communicatively connecting the test instrument to an Optical Line Terminal (OLT) that controls information flow to the specific customer premises through the optical network and transmitting the customized authentication information of the particular ONT from the test instrument to the OLT for the OLT to authenticate the test instrument as if the test instrument is the particular ONT installed at the specific customer premises; and
upon the test instrument being authenticated to be the particular ONT installed at the specific customer premises, perform the one or more service tests on the optical network for the particular ONT via the connection between the test instrument and the OLT, wherein the one or more service tests include testing a physical layer of data communication through a fiber optic cable connecting the specific customer premises to the optical network by measuring power levels of optical signals received by an optical detector of the test instrument.

### Claim 2 (depends on 1)

The test instrument of claim 1, wherein the data storage further stores a workflow profile specifying a plurality of tests to be performed by the test instrument and a specific order of the plurality of tests to be performed, and
wherein the controller is to:
execute a first test of the plurality of tests;
determine whether the first test passes or fails; and
responsive to determining that the first test passes, execute a second test of the plurality of tests according to the specific order.

### Claim 3 (depends on 1)

The test instrument of claim 1, wherein the first ONT model of the particular ONT includes ONT hardware configuration information of the particular ONT, and wherein the controller is to:
transmit at least some of the ONT hardware configuration information of the particular ONT to the OLT.

### Claim 4 (depends on 3)

The test instrument of claim 3, wherein the ONT hardware configuration information of the particular ONT specifies hardware that the particular ONT includes but that the test instrument does not include.

### Claim 5 (depends on 1)

The test instrument of claim 1, wherein the first ONT model of the particular ONT includes ONT soft configuration information, and wherein to connect to the OLT, the controller is to:
use at least some of the ONT soft configuration information of the particular ONT for connecting the test instrument to the OLT.

### Claim 6 (depends on 5)

The test instrument of claim 5, wherein to use at least some of the ONT soft configuration information, the controller is to configure network communication packets of the test instrument based on the ONT soft configuration information of the particular ONT.

### Claim 7 (depends on 1)

The test instrument of claim 1, further comprising:
an Ethernet tester; and
an Ethernet interface connectable to a router at the specific customer premises via an electrical cable,
wherein the controller is to execute the Ethernet tester to test data communication through the Ethernet interface by transmitting data through the Ethernet interface to the router at the specific customer premises and determining whether electrical signals are being received from the router in response to the transmitted data.

### Claim 8 (depends on 1)

The test instrument of claim 1, further comprising:
a Wireless Fidelity (WiFi) tester; and
a WiFi interface connectable to a router at the specific customer premises via a wireless link,
wherein the controller is to execute the WiFi tester to test data communication through the wireless link by measuring a wireless signal strength of the wireless link.

### Claim 9 (depends on 1)

The test instrument of claim 1, wherein the data storage is to receive the first ONT model of the particular ONT from a remote apparatus or a cloud platform.

### Claim 10

A method comprising:
in response to receiving a test flow that indicates one or more service tests to be performed across an optical network at a specific customer premises where a particular Optical Network Terminal (ONT) is installed, accessing, by a processor of a test instrument, a data storage in the test instrument to obtain a first ONT model of the particular ONT, wherein the first ONT model includes customized configuration of the particular ONT and customized authentication information of the particular ONT;
obtaining, by the processor, the customized authentication information of the particular ONT from the first ONT model of the particular ONT;
emulating, by the processor, the particular ONT installed at the specific customer premises by communicatively connecting the test instrument to an Optical Line Terminal (OLT) that controls information flow to the specific customer premises through the optical network and transmitting the customized authentication information of the particular ONT to the OLT for the OLT to authenticate the test instrument as if the test instrument is the particular ONT installed at the specific customer premises; and
upon the test instrument being authenticated to be the particular ONT installed at the specific customer premises, performing, by the processor, the one or more service tests on the optical network for the particular ONT via the connection between the test instrument and the OLT, wherein performing the one or more service tests include testing a physical layer of data communication through a fiber optic cable connecting the specific customer premises to the optical network by measuring power levels of optical signals received by an optical detector of the test instrument.

### Claim 11 (depends on 10)

The method of claim 10, wherein the data storage further stores a workflow profile specifying a plurality of tests to be performed by the test instrument and a specific order of the plurality of tests to be performed, and
wherein the method further comprises:
executing, by the processor, a first test of the plurality of tests;
determining, by the processor, whether the first test passes or fails; and
responsive to determining that the first test passes, executing, by the processor, a second test of the plurality of tests according to the specific order.

### Claim 12 (depends on 10)

The method of claim 10, wherein the first ONT model includes ONT hardware configuration information of the particular ONT that specifies hardware that the particular ONT includes but that the test instrument does not include, and wherein the method further comprises:
transmitting at least some of the ONT hardware configuration information of the particular ONT to the OLT.

### Claim 13 (depends on 10)

The method of claim 10, wherein the first ONT model of the particular ONT includes ONT soft configuration information to connect to the OLT, and wherein the method further comprises:
configuring network communication packets of the test instrument based on the ONT soft configuration information of the particular ONT; and
using the network communication packets for connecting the test instrument to the OLT.

### Claim 14 (depends on 10)

The method of claim 10, further comprising:
connecting an Ethernet interface of the test instrument to a router at the specific customer premises via an electrical cable; and
testing data communication through the Ethernet interface by transmitting data through the Ethernet interface to the router at the specific customer premises and determining whether electrical signals are being received from the router in response to the transmitted data.

### Claim 15 (depends on 10)

The method of claim 10, further comprising:
connecting a Wireless Fidelity (WiFi) interface of the test instrument to a router at the specific customer premises via a wireless link; and
testing data communication through the wireless link by measuring a wireless signal strength received via the wireless link.

### Claim 16

A portable field-deployable test instrument comprising:
a fiber optic interface to connect the test instrument to an optical network at a specific customer premises where a particular Optical Network Terminal (ONT) is installed;
data storage to store a first ONT model of the particular ONT, wherein the first ONT model includes customized configuration of the particular ONT and customized authentication information of the particular ONT;
a processor; and
a memory storing instructions that, when executed, cause the processor to:
in response to receiving a test flow that indicates one or more service tests to be performed across the optical network, access the data storage to obtain the first ONT model of the particular ONT, including obtaining the customized authentication information of the particular ONT;
emulate the particular ONT installed at the specific customer premises by communicatively connecting the test instrument to an Optical Line Terminal (OLT) that controls information flow to the specific customer premises through the optical network and transmitting the customized authentication information of the particular ONT from the test instrument to the OLT for the OLT to authenticate the test instrument as if the test instrument is the particular ONT installed at the specific customer premises; and
upon the test instrument being authenticated to be the particular ONT installed at the specific customer premises, perform the one or more service tests on the optical network for the particular ONT via the connection between the test instrument and the OLT, wherein the one or more service tests include testing a physical layer of data communication through a fiber optic cable connecting the specific customer premises to the optical network by measuring power levels of optical signals received by an optical detector of the test instrument.

### Claim 17 (depends on 16)

The test instrument of claim 16, wherein the data storage further stores a workflow profile specifying a plurality of tests to be performed by the test instrument and a specific order of the plurality of tests to be performed, and
wherein the instructions are executable to cause the processor to:
execute a first test of the plurality of tests;
determine whether the first test passes or fails; and
responsive to determining that the first test passes, execute a second test of the plurality of tests according to the specific order.

### Claim 18 (depends on 16)

The test instrument of claim 16, wherein the first ONT model of the particular ONT includes ONT soft configuration information, and wherein, to connect the test instrument to the OLT, the instructions are executable to cause the processor to:
configure network communication packets of the test instrument based on the ONT soft configuration information of the particular ONT; and
use the network communication packets for connecting the test instrument to the OLT.

### Claim 19 (depends on 16)

The test instrument of claim 16, further comprising:
an Ethernet interface,
wherein the instructions are executable to cause the processor to:
connect the Ethernet interface of the test instrument to a router at the specific customer premises via an electrical cable; and
test data communication through the Ethernet interface by transmitting data through the Ethernet interface to the router at the specific customer premises and determining whether electrical signals are being received from the router in response to the transmitted data.

### Claim 20 (depends on 16)

The test instrument of claim 16, further comprising:
a Wireless Fidelity (WiFi) interface,
wherein the instructions are executable to cause the processor to:
connect the WiFi interface of the test instrument to a router at the specific customer premises via a wireless link; and
test data communication through the wireless link by measuring a wireless signal strength received via the wireless link.