GSE主要出现在IEC61850-7-2和IEC前者定义了61850-8中ACSI(抽象通信服务接口)，后者实现SCSM(具体通信服务映射)GSE的映射。

GSSE其实是UCA2.0中定义的GOOSE，但不支持报文优先级、虚拟局域网、无特定多播地址等。这使得当网络负载较重时，很难保证报文传输的实时性。GSSE目前使用较少。

从协议分析的角度来看，已知的报纸格式包括Header，DNA和User Bits三部分，DNA也可以找到源文档的格式GOMSFE .9, January 14, 1999年很难获得，其次，在网上找不到GSSE的PCAP目前不支持包GSSE的解析。

GSE涉及两类，10种服务。GOOSE控制块类和GSSE控制块类，每个类下有5种服务。只有这10种服务SendGSSEMessage没有明确的定义，其他的都支持分析。

GoCB类

服务

GsCB类

服务

GSE的asn格式描述如下，但其不包含GSSE，来源是IEC61859-8-1，但是原始的代码格式已经不支持现在版本的ASN1编译器，以下代码是参考原始代码和wireshar代码修改过的版本。

IEC61850 DEFINITIONS ::= BEGIN

IEC61850SpecificProtocol ::= CHOICE {
	gseMngtPdu [APPLICATION 0] IMPLICIT GSEMngtPdu,
	goosePdu [APPLICATION 1] IMPLICIT IECGoosePdu
}

GSEMngtPdu ::= SEQUENCE  {
	stateID  	[0] IMPLICIT INTEGER,
	security 	[3] ANY OPTIONAL,
	requestResp	RequestResponse
}

RequestResponse ::= CHOICE{
		requests			[1] EXPLICIT GSEMngtRequests,
		responses			[2] EXPLICIT GSEMngtResponses
}

GSEMngtRequests ::= CHOICE {
	getGoReference   	        [1] IMPLICIT GetReferenceRequestPdu,
	getGOOSEElementNumber 	    [2] IMPLICIT GetElementRequestPdu,
	getGsReference	            [3] IMPLICIT GetReferenceRequestPdu,
	getGSSEDataOffset	        [4] IMPLICIT GetElementRequestPdu,
	...
}


GSEMngtResponses ::= CHOICE {
	gseMngtNotSupported		[0] IMPLICIT NULL,
	getGoReference     	    [1] IMPLICIT GSEMngtResponsePdu,
	getGOOSEElementNumber   [2] IMPLICIT GSEMngtResponsePdu,
	getGsReference			[3] IMPLICIT GSEMngtResponsePdu,
	getGSSEDataOffset		[4] IMPLICIT GSEMngtResponsePdu,
	...
}


GetReferenceRequestPdu ::= SEQUENCE {
	ident	  		[0] IMPLICIT VisibleString,   
	-- 可支持多达 65个八位组
	offset			[1] IMPLICIT SEQUENCE OF INTEGER,
	...
}


GetElementRequestPdu ::= SEQUENCE {
	ident   	[0] IMPLICIT VisibleString,   
	--可支持多达 65个八位组
	references 	[1] IMPLICIT SEQUENCE OF VisibleString,
	...
}

GSEMngtResponsePdu ::= SEQUENCE {
	ident		[0] IMPLICIT VisibleString,
	-- 返回请求的值
	confRev	    [1] IMPLICIT INTEGER OPTIONAL,
	posNeg		PositiveNegative,
	...
}


PositiveNegative ::= CHOICE{
		responsePositive  [2] IMPLICIT SEQUENCE {
			datSet         [0] IMPLICIT VisibleString OPTIONAL,
			result  	[1] IMPLICIT SEQUENCE OF RequestResults
			},
		responseNegative [3] IMPLICIT GlbErrors
}

RequestResults::= CHOICE {
	offset		[0] IMPLICIT INTEGER,
	reference	[1] IMPLICIT IA5String,
	error		[2] IMPLICIT ErrorReason
}


GlbErrors ::= INTEGER {
	other(0),
	unknownControlBlock(1),
	responseTooLarge(2),
	controlBlockConfigurationError (3)
}


ErrorReason ::= INTEGER {
	other (0),
	notFound (1)
}



IECGoosePdu ::= SEQUENCE {
	gocbRef 			[0] IMPLICIT VisibleString,
	timeAllowedtoLive 	[1] IMPLICIT INTEGER,
	datSet 				[2] IMPLICIT VisibleString,
	goID 				[3] IMPLICIT VisibleString OPTIONAL,
	t 					[4]	IMPLICIT UtcTime,
	stNum 				[5] IMPLICIT INTEGER,
	sqNum 				[6] IMPLICIT INTEGER,
	simulation 			[7] IMPLICIT BOOLEAN DEFAULT FALSE,
	confRev 			[8] IMPLICIT INTEGER,
	ndsCom 				[9] IMPLICIT BOOLEAN DEFAULT FALSE,
	numDatSetEntries 	[10] IMPLICIT INTEGER,
	allData 			[11] IMPLICIT SEQUENCE OF GooseData
}

GooseData ::= CHOICE
	{
	-- context tag 0 is reserved for AccessResult
	array			[1] IMPLICIT DataSequence,
	structure		[2] IMPLICIT DataSequence,
	boolean			[3] IMPLICIT BOOLEAN,
	bitstring		[4] IMPLICIT BIT STRING,
	integer			[5] IMPLICIT INTEGER,
	unsigned		[6] IMPLICIT INTEGER, -- shall not be negative
	floatingpoint		[7] IMPLICIT FloatingPoint,
	--			[8] is reserved
	octetstring		[9] IMPLICIT OCTET STRING,
	visiblestring		[10] IMPLICIT VisibleString,
	generalizedtime	[11] IMPLICIT GeneralizedTime,
	binarytime		[12] IMPLICIT TimeOfDay,
	bcd			[13] IMPLICIT INTEGER,
	booleanArray		[14] IMPLICIT BIT STRING,
	--objId			[15] IMPLICIT OBJECT IDENTIFIER
	mMSString		[16] IMPLICIT MMSString, -- unicode string
	utctime		[17] IMPLICIT UtcTime   --UTC Time
	}

DataSequence ::= SEQUENCE OF GooseData

FloatingPoint ::= OCTET STRING

UtcTime ::= OCTET STRING 	-- 格式和大小规定在8.1.3.6.

MMSString ::= UTF8String

TimeOfDay ::= OCTET STRING -- (SIZE (4 | 6))

END

表B1-建议的分组广播地址例子

表C2-以太网类型值分配

参见 gseMngtPdu.gmind 文件

GOOSE和SV报文都是基于ISO/IEC 8802-3框架进行通讯，其基本帧结构如下

GOOSE的APDU报文格式见下表

allData中的数据由DatSet数据集定义，在不同系统中是不一样的，可以有SCL文件配置。