PHY-Level Collision Avoidance

<p>PHY-Level Collision Avoidance (PLCA) is a component of the Ethernet <a href="/facts/Reconciliation_sublayer/6rRuuacv">reconciliation sublayer</a> (between the <a href="/facts/PHY/tkEaBnt9">PHY</a> and the <a href="/facts/Medium_access_control/hFpNzFFD">MAC</a>) defined within <a href="/facts/IEEE_802.3/Q9jxNSNT">IEEE 802.3</a> clause 148. The purpose of PLCA is to avoid the <a href="/facts/Shared_medium/7BPrQ65Q">shared medium</a> collisions and associated <a href="/facts/Retransmission_(data_networks)/Em3pHg0f">retransmission</a> overhead. PLCA is used in <a href="/facts/802.3cg/2jRlgJb4">802.3cg</a> (10BASE-T1), which focuses on bringing Ethernet connectivity to short-haul <a href="/facts/Embedded_systems/a4muX1wU">embedded</a> <a href="/facts/Internet_of_things/rwwGAxn3">internet of things</a> and low <a href="/facts/Throughput/6zAUsXqw">throughput</a>, <a href="/facts/Noise_(electronics)/Izbv38Rr">noise</a>-tolerant, industrial deployment use cases.
</p><p>In order for a <a href="/facts/Multidrop/2SMRsccq">multidrop</a> 10BASE-T1S standard to successfully compete with <a href="/facts/CAN_bus/EGxoS88W">CAN XL</a>, some kind of arbitration was necessary. The linear arbitration scheme of PLCA somewhat resembles that of the <a href="/facts/Byteflight/8qkAlygW">Byteflight</a>, but PLCA was designed from scratch to accommodate the existing shared medium Ethernet MACs with their busy sensing mechanisms.
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PHY-Level Collision Avoidance open-in-new

PHY-Level Collision Avoidance