PL-4 or POS-PHY Level 4 was the name of the interface that the interface SPI-4.2 is based on. It was proposed by PMC-Sierra to the Optical Internetworking Forum . The name means Packet Over SONET Physical layer level 4. PL-4 was developed by PMC-Sierra in conjunction with the Saturn Development Group.
4-547: There are two broad categories of chip-to-chip interfaces. The first, exemplified by PCI-Express and HyperTransport , supports reads and writes of memory addresses. The second broad category carries user packets over 1 or more channels and is exemplified by the IEEE 802.3 family of Media Independent Interfaces and the Optical Internetworking Forum family of System Packet Interfaces . Of these last two,
8-789: Is important when overhead bytes are added to incoming packets. The name is an acronym of an acronym of an acronym as the P in PL stands for POS-PHY and the S in POS-PHY stands for SONET ( Synchronous Optical Network ). PL-4 is a descendant of PL-3 which itself is a descendant of the ATM Forum UTOPIA family of standards. The UTOPIA standards were developed by the SATURN Development Group for use in ATM systems. PCI-Express Too Many Requests If you report this error to
12-437: Is sometimes used in 10 Gigabit Ethernet based systems. A typical application of PL-4 (SPI-4.2) is to connect a framer device to a network processor. It has been widely adopted by the high speed networking marketplace. The interface consists of (per direction): The clocking is Source-synchronous and operates around 700 MHz. Implementations of SPI-4.2 (PL-4) have been produced which allow somewhat higher clock rates. This
16-498: The family of System Packet Interfaces is optimized to carry user packets from many channels. The family of System Packet Interfaces is the most important packet-oriented, chip-to-chip interface family used between devices in the Packet over SONET and Optical Transport Network , which are the principal protocols used to carry the internet between cities. PL-4 was designed to be used in systems that support OC-192 SONET interfaces and
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