---
oid: "1.3.6.1.4.1.637.54.1.25.2.1.4.1.8"
asn1-notation: "{iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) 637 ltt(54) tsdim(1) opticsimEthMib(25) opticsimEthNEMib(2) opticsimEthNEMibObject(1) opticsIMifMauExtTable(4) opticsIMifMauExtEntry(1) opticsIMifMauExtSynchOperationMode(8)}"
description: "opticsIMifMauExtSynchOperationMode OBJECT-TYPE "
last-modified: "2026-06-02"
tags: [oid-repository]
---

## OID: `1.3.6.1.4.1.637.54.1.25.2.1.4.1.8` (last updated: 2026-06-02)

```asn1
{iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) 637 ltt(54) tsdim(1) opticsimEthMib(25) opticsimEthNEMib(2) opticsimEthNEMibObject(1) opticsIMifMauExtTable(4) opticsIMifMauExtEntry(1) opticsIMifMauExtSynchOperationMode(8)}
```

### Description

```asn1
opticsIMifMauExtSynchOperationMode OBJECT-TYPE 
SYNTAX INTEGER {synchronous(1), asynchronous(2)} 
MAX-ACCESS read-write 
STATUS current 
DESCRIPTION 
"It is used to define the Operation Mode (G.8264) of an Ethernet interface 
with the following values: 
- synchronous (1) 
the interface is belonging to a NE with system clock (EEC) and it should 
be used for synchronization purpose; in this case the 
opticsIMifMauExtSynchRole object has to be defined as 'master' or 'slave' 
value. 
- asynchronous (2) 
the interface is not belonging to a NE with system clock (EEC); in this 
case the opticsIMifMauExtSynchRole object could assume any value 
incuding 'auto' value (default)."

**Classification**: MIB object for network management

### Child OIDs

No child OID

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**Note to implementers:**: The OID repository is constantly updated but does not necessarily store the latest (or most accurate) version of this formal description. For an implementation, it is recommended to search the web for a more recent description. If this is the case, please update the above description.