IEEE服务解读

相信通信行业内很多人都与IEEE打过交道，IEEE网可以申请mac地址号段，有MA-S，MA-M，MA-L可以选择，mac地址号段数量分别是4096个，100万个，1600万个。其实IEEE网有很多的用途，mac地址申请只是其中一小部分。知倍客将介绍下IEEE机构申请其他方面的信息。

大家可以看到除了申请mac地址外还有Company ID、Ethertype、manufacturer ID、Logical Link Control (LLC)、URN、TDL、PSID等等，里面还有一些通信方面的标准可以下载，下面将先介绍下前面几个。

Company ID, like the OUI, is a unique 24-bit identifier. A CID though, cannot be used to generate universally unique MAC addresses. Therefore, the CID is especially applicable in applications where unique MAC addresses are not required. A CID should be applicable in most other cases where an OUI is specified. The CID has been created to reduce the consumption of OUI values.

Ethertype：The Ethertype provides a context for interpretation of the data field of an Ethernet/802.3™ data frame (protocol identification). Refer to IEEE Std 802.3, clause 3 and especially sub-clauses 3.1.1 and 3.2.6. See also IEEE Std 802® sub-clause 10.4.

manufacturer ID:Within a 64-bit section of the 1451.4 TEDS, called basic TEDS, the manufacturer of the transducer is defined with a 14-bit code called the manufacturer ID, along with manufacturer-assigned transducer model number, model letter, model version number and serial number.

Link Control (LLC):LLC protocol data units (PDUs) contain addressing information that consists of two fields; the Destination Service Access Point (DSAP) address field, and the Source Service Access Point (SSAP) address field. Each of these is an 8-bit field and made up of two components.

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