ZyXEL Communications OLT2406, Руководство пользователя

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OLT2406 User’s Guide
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37
OLT Registration
37.1 OLT Registration Overview
The OLT Registration screens include OLT Registration , Tca Configuration , ONT Summary , OLT Status , OLT
Counter , and Tca Status .
37.1.1 What You Can Do
• Use the OLT Registration screen ( Section 37.2 on page 296 ) to configure how you want to register the
ONTs that are connected to a GPON interface on the OLT.
• Use the Tca Configuration screen ( Section 37.3 on page 298 ) to configure thresholds for the TCA
profile.
• Use the ONT Summary screen ( Section 37.4 on page 299 ) to view the status of all ONTs for each GPON
interface.
• Use the OLT Status screen ( Section 37.5 on page 300 ) to view the OLT status.
37.1.2 What You Need to Know
The following terms and concepts may help as you read this chapter.
Forward Error Correction (FEC)
FEC is a technique to control errors in packets and correct errors without transmitting the packets again.
FEC adds redundant information in the packets, so the receivers can identify and correct the errors in
the packets. This increases data quality and saves bandwidth usage of the OLT.
Authentication Process
The authentication process includes the six states below.
• O1 Initial-state : An ONT is in this state when it’s turned on. Two alarm messages, LOS (Loss of Signal)
and LOF (Loss of Frame) will be asserted. When downstream traffic is received, these alarm messages
will be cleared, and the ONT goes to O2 state.
• O2 Standby-state : When the ONT receives the Upstream_Overhead message, relevant parameters
will be configures, and the ONT goes to O3 state.
• O3 Serial-Number-state : The OLT requests GPON serial numbers of the ONT in this state. When the ONT
is discovered, the OLT will assign a unique ONT ID. The ONT goes to O4 state when it has an ONT ID.
• O4 Ranging-state : An equalization delay is measured for the ONT in this state. This synchronized the
upstream transmission of the ONTs located in different places. When the ONT received the
Ranging_Time message, it goes to O5 state.
• O5 Operation-state : The ONT can send upstream data and PLOAM messaged in this state.