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Stofa Completes European Trial of Remote PHY With Timing From Microsemi

Stofa, a Denmark cable operator and broadband service provider, has completed a trial of Remote PHY (R-PHY) based on the DOCSIS 3.1 standard using Converged Cable Access Platforms (CCAP) and optical nodes from Arris.

Microsemi, a subsidiary of Microchip Technology, donated its TimeProvider 4100, an IEEE 1588 Precision Time Protocol (PTP) grandmaster clock, so Stofa could meet the PTP synchronization requirements of the new Remote PHY architecture.

Pay TV and broadband service providers like Stofa are moving to deploy R-PHY to meet demands for additional network access capacity driven by several factors. These include rapid growth in bandwidth demands for both residential and commercial high-speed broadband data services, convergence of MPEG video services on the CCAP while replacing aging Edge QAM products, and finally migration to IP video distribution services.

R-PHY technology helps meet these bandwidth demands by making more efficient use of the network media, enabling service speeds up to 1Gbps. DOCSIS 3.1 requires strict Precision Time Protocol (PTP) and synchronization requirements based on the IEEE 1588 v2 standard. In such installations the cable modem termination system (CMTS) and the R-PHY devices act as IEEE-1588 v2 slaves with a 1 millisecond phase alignment enabled via an IEEE-1588 v2 grandmaster clock.

Microsemi’s TimeProvider 4100 provides eight Ethernet fan-out ports in its base unit. TimeProvider 4100 meets the current IEEE-1588 v2 profiles for frequency and phase, and features scalability to support a high number of PTP slaves, which are often required in newer cable infrastructures using the new DOCSIS 3.1 standard.

The TimeProvider family can scale from the core to the aggregation and edge layers of access networks, as well as mobile infrastructure. The gateway clock is complementary to its higher capacity and fully redundant TimeProvider 5000 core grandmaster clock, which is used for higher density core deployments.

According to Microsemi, the device represents a new class of synchronization product that accept multiple inputs from Global Navigation Satellite Systems (GNSS), Synchronous Ethernet (SyncE), 1588 PTP and E1/T1 digital transmission links, and distributes timing flows to multiple endpoints.

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