name: L2
full_form: Layer 2
context: Fully standardizing one L2 to the exclusion of allowing others would solve the multi-vendor issue for point-to-point links. But, standardizing one exclusive L2 protocol that must be used in the UTRAn NEs would restrict the flexibility for the operators. A solution which solves the multi-vendor issue, but still offers the full flexibility would be the preferred approach for the L2 standardization for IP transport in UTRAN. Requiring the implementation of one or a limited set of L2 protocols, but still allow the use of any L2 protocol in the UTRAn NEs would be a good solution for the standard. The L2 protocol specified in the standard to be implemented in the UTRAn NEs should be the PPP protocol [11] with its extensions PPPmux [10] and ML/MC-PPP [20], [21] and header compression. During the work in RAN3 for IP transport it has been shown that the PPPmux approach fulfils the requirements and provides good performance. The layer 2 framing protocol below PPP is FFS.
description: Layer 2 (L2) is a standardized protocol for data transmission in the UTRAN network, specifically for IP transport. It involves protocols such as PPP (Point-to-Point Protocol), PPPmux, ML/MC-PPP, and header compression, which are used for framing and transmitting data between nodes in the network.
explanation: The text explicitly mentions 'protocols' like PPP, PPPmux, ML/MC-PPP, and header compression used for data transmission within the UTRAN network. This clearly classifies Layer 2 as a Protocol.
section_title: 6.6.1.3	L2 standardized
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