3.0 Introduction
3.1 FX120 Overview
The VeEX® FX120 XG(S)-PON Analyzer is designed to assist with PON ONT/ONU service activation and aid in troubleshooting.
When connected at the customer site between the splitter and Optical Network Unit/Optical Network Terminal (ONU/ONT), the unit
passively monitors downstream and upstream GPON and XGS-PON traffic, tests optical power levels for compliance to standards
and when available captures/decodes PLOAM messages exchanged from the OLT and ONT to provide PON-ID per ITU-T, OLT
Transmit power, PON type and Class, ONU ID, ONU Serial Number, and ONU Status.
The operator is assumed to have received basic training in fiber optics and related testing and measurement practices.
1G/10G PON Optical Power Meter with PON ID Analysis per ITU-T
1490/1577 PON ID decode and optical power measurement
1270/1310 ONU ID decode and optical power measurement
1550 RF video optical power measurement
Speed test up to 10G
3.2 What is xPON
The International Telecommunications Union standards (ITU-T G.984 and G.987) describes attributes of passive optical network
(xPON) systems. xPON utilizes optical wavelength division multiplexing (WDM) so a single fiber from a provider’s central office can
be split to serve multiple homes and businesses for both downstream and upstream data transmission.
The Optical Line Terminal (OLT) sends 1490nm signal downstream at a rate of 2.488 Gbits/s for GPON or sends 1577nm signal
downstream at a rate of 9.95328 Gbits/s for XGS-PON. Every Optical Network Unit/Optical Network Terminal (ONU/ONT) receives
the same data but is able to recognize data targeted to a specific ONU/ONT. Each ONU/ONT upstream 1310nm signal transmits at
a rate of 1.244 Gbits/s for GPON whilst a 1270nm signal transmits at a rate of 9.95328 Gbits/s for XGS-PON, using a time division
multiplex (TDM) format as each ONU/ONT is assigned a time slot in which it can transmit to the OLT. The total available bandwidth
is divided between all ONUs so each user only gets a fraction of available bandwidth, such as 100 Mbits/s, depending on how the
OLT allocates it. The upstream transmissions, called burst-mode operation, is allocated on an as need basis by the OLT for each
ONU/ONT that needs to send data. Because the TDM method involves multiple users on a single transmission, the upstream data
rate is always less than the maximum available bandwidth to support sharing of bandwidth.
The OLT determines the distance and time delay for each subscriber. The software provides a way to allot time slots to upstream
data for each ONU. The typical split of a single fiber is 1:32 or 1:64. That means each fiber can serve up to 32 or 64 subscribers.
However, split ratios up to 1:256 are possible on some systems.
3.3 Key Features
Basic Mode
Dual port wavelength filtered, through-meter for simultaneous 1G and 10G ONT/ONU service verification for measuring
GPON ONT upstream and downstream level measurements for 1310 and 1490, for XGS-PON upstream and downstream
level measurement 1577 and 1270nm
Upstream/Downstream LED status indicators for signal and Frame
TC Sync per ITU-T
Automatic PON-ID detection* including OLT-ID, ODN class, Tx power, power level and ODN link pass/fail per ITU-T*
ONU/ONT ID and serial number; rogue and alien ONU detection
Low insertion loss:
≤
1.5 dB typ
Advanced Mode
Track/manage active ONT IDs and serial numbers
FX120_User_Manual_RevA02
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Summary of Contents for FX120
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