GPON Doctor™ 8000 - Gpondoctor Products

Gpondoctor 8000OLT Emulation and FTTH GPON Protocol Analyzer in one equipment

GPON Doctor™ is an “all in a box” GPON (Gigabit capable Passive Optical Network) based FTTH (Fibre To The Home) protocol sniffer, analyzer and OLT emulator, able to be connected to any location within any GPON ODN (Optical Distribution Network) and capture downstream and upstream bit-level information. It interprets all control and management information (OAM, PLOAM and OMCI), while providing real time upper layers traffic extraction. Being portable and fully oriented for interoperability tests it is a perfect tool for GPON Equipment Vendors and Telcos in GPON deployment/ turn-up/ troubleshooting phases.

Description

The GPON Doctor™ is the family of GPON protocol verification tools that will allow you to check the “health” of your PON network as a whole or, of every active element.

It is able to sniff (capture) all data simultaneously in upstream and downstream, and from the data captured run a smart ‘analysis’ engine to detect the PON status, entities, relation among the entities, bandwidth allocation and deviations against the standards. Depending on the version it also emulates an OLT for ONT conformance tests.

Features

Some of its main features are:

Services

The unique features of GPON Doctor™ enable its use as a Professional Test tool and can be used to provide the following services:

Broadband Forum Test Suite for ONU conformance and Interoperability available.

Features

Chipset-Less Implementation

Capture hardware exclusively developed for this product. Results are not biased by any vendor proprietary GPON hardware implementation.

PON Passive and position independent

Control data frame by frame inspection without need of traffic regeneration or modification. Including an automatic adaptive synchronization system to compensate distance to the OLT.

Capture+Analyze+Evaluate

Starting from the captured data, it is capable of inferring the network topology and applying a series of rules to verify the compliance with the ITU-T G. 984.x recommendation.

Real time GPON Capture

GPON Doctor™ captures GTC and OMCI messages over the fibre in Real Time to help to keep track of negotiation processes and configurations.

OLT Emulation

Emulates OLT functionality, allowing to build specific provisioning models and configure OMCI entities individually and sequentially, carrying real traffic at 10Gbp/s.

Real time user traffic extraction

GPON Doctor™ extracts decrypted user traffic in real time and at Ethernet layer. This traffic is made available at the 10/100/1000BaseT interface for its monitoring and upper layer analysis by external network analyzing tools and/or other application tools. Its hardware decoder fully supports AES automatic decryption combined with FEC encoding.

Remote Analysis and automatic calibration

Connected to an IP network, allows the analysis of a GPON network from a remote management workstation. Automatic calibration of the equipment in the network to analyze.

Service regeneration and QoS Evaluation

GPON Doctor™ can regenerate services established over a PON network. i.e. Multicast video can be sniffed & reassembled in real time and watched on GPON Doctors™ screen. This feature is perfect to evaluate QoS and QoE of configured services over a PON.

Windows 7 Embedded

User friendly interface. Being based on windows 7, other analysis and office applications needed in the daily work at your lab can be easily installed.

Applications

Problems in PON and GPON networks

With the aim of reducing the ONTs price it is important that any OLT is capable to interact with any ONT regardless its manufacturer. However, GPON has a number of intrinsic characteristics that could make difficult the interoperability among manufacturers:

Commercial implementations from earlier versions of the standard.
Problems during the activation process.
Misinterpretation of the standard.
OMCI, a very broad standard.
Heterogeneity among operators.

Furthermore, the structure of a PON network is a fiber that is divided over using optical power dividers or splitters. At this point it appears the concept of “degree of splitting”, defined as the number of divisions that suffers the fiber to reach an ONT. The degree of splitting indicates that the percentage of optical power arriving to an ONT. Attenuation in a GPON circuit can be very high due to the sum of fibre splitting, connectorization (Insertion loss), fusion splice, and distance in the fiber, and thus, some of the network active elements operate under stress conditions.

All these factors imply a great challenge in the deployment of GPON networks.

Transparent analysis and Capture

Network analysis and evaluation

Technical Specifications

Technical features

Capture OAM + PLOAM control data and OMCI messages (full support).
Real Time PLOAM + OMCI + Negotiation messages capture.
Long duration captures (~30 minutes).
Low attenuation ( Infers the GTC machines in ONTs state and the ONTs OMCI entities state/value.
Infers network topology: ONU/ONTs, OLT.
Evaluation of the compliance degree with the ITU-G.984.x standard, generating a list of standard inconsistencies and violations.
Bandwidth distribution analysis per T-CONTs for every ONT.
Real Time Service regeneration and monitoring: Multicast Video, Voice.
GPON Analyzer and OLT Emulator integrated in the same equipment.
Automatic calibration.
Real time upper layer Ethernet traffic extraction.
Windows 7 Embedded Operating System.
Automatic behaviour: capture, analyze and evaluate in one click.
Captures storage for further analysis by the GPON-Doctor™.
Hardware/software customization upon request.

Interfaces

Touch screen (High definition colour TFT, 12’’, 1280×800).
2xGigabit Ethernet Capture/Management modules: QinQ Transparent/Stripping configurable.
Gigabit Ethernet over GPON Real Time Extraction port: External network protocol analyzer plug in.
6x USB 2.0 to easy transfer data, traces and reports export.
GPON capture interfaces:
- Downstream: SFP Single Mode 1490nm (2,5Gbps) module. SM 1310nm optional.
- Upstream: Single Mode 1310nm (1,25Gbps)

Downloads

Free access to our product related documentation: product brochures, datasheets, quick start guides and more. Please contact our customers service with questions.

Prices of the website price list are for sale outside Spain.

Product brochure GPONDOCTOR 8000

FAQs

GPON Doctor reports uLOSb, why?

GPON Doctor displays this message in the capture window when it expects an upstream burst according to downstream BWMaps (SSTART and SSTOP) and no optical signal is detected in the upstream direction. Please note that uLOSb and uLOFb are not messages exchanged by OLT and ONUs, but an indication generated by the GPON Doctor itself.
The most common reason for this indication is that the addressed ONU is not connected in the same branch as the GPON Doctor. Other reasons for these notification is that the ONU is not working properly (it is not generating transmissions when indicated by the OLT) or that there are power issues.
When GPON Doctor includes uLOSb indications in the capture window these are also reflected in the Errors Report as LOSB notifications. When 4 or more of these notifications happen consecutively for the same ONU this will be reported as an “ONU enters in LOSi” Warning.

There are a lot of CRC errors in the capture, why?

Once transmission errors are discarded (both OLT and ONUs are operating “correctly”) and many CRC errors are still reported by GPON Doctor, the most common reason for these indications is that GPON Doctor is not working in the optimal optical operation range. Either the optical power is under the sensitivity limit or over the saturation point. Please, check the optical power before the capture to ensure GPON Doctor receives adequate optical power.
Furthermore, some power meters obtain the average measure. In downstream, the value is reliable because the OLT sends a continuous optical signal, but in the upstream, the traffic is based on bursts. Therefore, the optical meters can provide a wrong or tricky measure.

GPON Doctor detects uLOFb, why?

GPON Doctor displays this message in the capture window when it expects an upstream burst according to downstream BWMaps (SSTART and SSTOP) and although a valid optical signal is received, the delimiter cannot be found. Please note that uLOSb and uLOFb are not messages exchanged by OLT and ONUs, but an indication generated by the GPON Doctor itself.
Possible reasons for this indication are that the ONU is not working properly (it is not generating transmissions when indicated by the OLT) or that there are power issues.
When GPON Doctor includes uLOFb indications in the capture window these are also reflected in the Errors Report as LOFB notifications. When 4 or more of these notifications happen consecutively for the same ONU this will be reported as an “ONU enters in LOFi” Warning.