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Switch Modules
Quad
10 GbE
MAC/NIC
Module
10 GbE Line Card or NIC
10GBASE-KR
Backplane
Module
4 × 10G
4 × 10G
4 × 1G
10 GbE
4 x 10G
4 x 1G
10 G
Switch
Module
Module
4 x 10G
4 x 1G
VSC8257
VSC8257
Highlights
• Standards supported include
IEEE1588v2/Y.1731 OAM (4 ns),
IEEE802.3ae, IEEE 802.3ap, SFF-8431,
ITU-T G.8261, and ITU-T G.8262
• Support for 10G LAN, 10G WAN, and 1G
modes
• Support for SFP+/QSFP+ line modules
and 10GBASE-KR backplanes between
1.25Gbps and 10.3125 Gbps (including
auto-negotiation and training)
Applications
• Multi-port serial-to-serial signal conditioning
• 10GBASE-KR-compliant backplane
transceivers
• Networks requiring high-accuracy time
synchronization
• Multi-port XFI/KR to SFI/SFP+ 10 GbE
switch cards, router cards, and network
adapters
VSC8257 is a quad 1G/10G serial-to-serial Ethernet PHY featuring
VeriTime™, Microsemi's IEEE 1588v2 network timing technology. It
also supports dual-sided 10GBASE-KR functionality including auto-
negotiation and training in a small form factor, low-power FCBGA ideal
for a wide array of board-level signal integrity designs and system-level
IEEE standard compliant Ethernet connectivity.
VeriTime™ is Microsemi's patent-pending network timing technology
that delivers the industry’s most accurate IEEE 1588v2 implementation.
It is the only IEEE 1588v2 solution to be validated by major OEMs in
real-world tests, and it has already been adopted as the preferred low-
cost upgrade for meeting emerging requirements in 4G/LTE-Advanced
(LTE-A). The VSC8257 device supports both 1-step and 2-step PTP
frames for ordinary clock, boundary clock, and transparent clock modes
of operation, along with complete Y.1731 OAM performance monitoring
capabilities.
Target applications for the VSC8257 device include switching, IP edge
router connectivity, rack mount server access through backplane, fi ber
and copper cable connectivity, and standalone server access (in LAN on
motherboard designs or separate network adapters).
The device delivers excellent jitter attenuation with low power. It is also
well-suited for SFP+ and QSFP+ based optical modules and direct
attach copper cabling as well as challenging backplane interface
applications.
VSC8257
Quad Channel 1G/10GBASE-KR to SFI Ethernet WIS PHY with VeriTime™