3com S7906E 설치 설명서

 

2-2 

When you remotely manage ONUs on an OLT device, extended OAM can encapsulate various 

operation and acknowledgement information in the Data field. The data field consists of the following 

sub-fields: 

z 

OUI: The OUI address of the transmitting device.  

z 

Ext.Opcode: Extended operation code. Extended OAM uses different codes for identifying the 

operation types of OAMPDUs, as described in 

.  

Table 2-1 Description on the extended operation codes 

0x01 

Extended Variable Request 

Sent from an OLT to an ONU, 
carrying the user's query 
instructions.  

0x02 

Extended Variable Response 

Sent from the ONU to the OLT 
in response to a query request, 
carrying the requested 
information.  

0x03 Set 

Request 

Sent from the OLT to the ONU, 
carrying the user's 
configuration instructions for 
the ONU.  

0x04 Set 

Response 

Sent from the ONU to the OLT 
after the ONU finishes the 
configuration instructed by the 
user.  

0x0A 

DBA (Dynamic Bandwidth 
Allocation) 

Used for performing DBA 
configuration and query. 

 

z 

Payload: Carries the function codes and configuration contents corresponding to the user’s query 

or configuration instructions. An OLT can configure the functions shown in 

 for ONUs.  

z 

Pad: Padding field.  

Extended OAM has two functions: extended OAM discovery and extended OAM management.  

An OLT and an ONU perform extended OAM discovery to determine whether they can communicate 

properly before transmitting data.  

First, the OLT and the ONU use standard OAM to judge whether the link in between is normal. If the link 

is normal, the OLT and the ONU exchanges Extended Information OAMPDUs to inform each other of 

their OUI addresses, supported OUI addresses, and OAM version numbers. If the OUI address and 

OAM version of each end can be supported by the other end, the extended OAM discovery process 

finishes and data transmission starts. Otherwise, the two ends cannot communicate normally.  

After finishing extended OAM discovery, the OLT device can remotely configure the ONU by sending 

Organization Specific OAMPDUs.