4G 5G Products
STS3 P425G8TS81 TimeSync Card
8 Ports 25 Gigabit Ethernet Grand Master, Boundary Clock, Slave Clock, PCIe GEN4 TimeSync card
Silicom’s P425G8TS81: The Ultimate TimeSync Card STS3 for 25/10 Gigabit Ethernet PCI Express Grand Master TimeSync Server Adapter
Silicom’s P425G8TS81 TimeSync Card STS3 25/10 Gigabit Ethernet PCI Express Grand Master TimeSync server adapter adds TimeSync/GM ability to server /mobile DU systems.
The Silicom P425G8TS81 TimeSync Card STS3 NIC is based on Intel E810 NIC controllers and Microchip / servo PLL.
Silicom’s STS3 Support 8 port of 25G/10G capabilities to synchronize host system with external clock source using 1PPS and 10MHz. The STS3 TimeSync server adapter support both 1588v2/PTP and SyncE for high clock accuracy in Master and Slave mode. STS3 design is meeting O-RAN requirements for LLS-C1, LLS-C2 and LLS-C3, modes of operations with both Boundary and Transparent clocks.

Real-time data transmission for 5G with Silicom STS line card: A low-cost solution with high timing accuracy
Silicom STS line card for 4G and 5G NIC enable real-time data transmission with high timing accuracy at the lowest cost to power 5G DRAN and CRAN edge deployments:
- Support 1588/PTP over IPv4 / IPV6, IEEE1588v2
- Support SyncE /ITU-T G.8262
- T-BC/T-TSC Boundary Clock and TSC Slave Clock /G.8273.2
- T-GM Grand Master /G.8273.1 per G.8275.1 PTP Profile
- PRTC Primary Reference Time Clock Class B/G.8272
- T-TC Transparent Clock /G.8273.3
- 1588 Software Stack and Servo Software in x86

STS3 P425G8TS81 TimeSync Card
8 Ports 25 Gigabit Ethernet Grand Master, Boundary Clock, Slave Clock, PCIe GEN4 TimeSync card
GM/TimeSync:
- Supports Grand Master clock per G.8275.1 Class-A PRTC/T-GM
- Supports Boundary Clock (BC) OC (Master / Slave)
- PTP over IPv4 / IPV6 (IEEE-1588v2) / SyncE
- One step and two step clock modes operation for PTP Master
- 10Mhz and 1PPS programmable output
- Full HW and SW GM/TimeSync solution based on industry leading DPLL, Servo stack and PTP1588
- Incorporates accurate OCXO
- Incorporates Global Navigation Satellite System (GNSS) receiver
- Packet and physical-layer frequency, phase and Grand Master GM/TimeSynchronization
- Enable 5G/Class C wireless application
LAN and Virtualization Features:
- SR-IOV (Single Root I/O Virtualization): up to 256 Virtual Functions
- Partially Programmable Pipeline and Advanced Traffic Steering
- Intel® Ethernet Flow Director – 8000 On-Die perfect match filters
- 1536 queues/Physical Function (PF), >64 RSS/PF and 256 VMDq/PF
STS3 P425G8TS81 TimeSync Card
8 Ports 25 Gigabit Ethernet Grand Master, Boundary Clock, Slave Clock, PCIe GEN4 TimeSync card
General Technical Specifications: 8 Ports: Silicom Grand Master GM/TimeSync
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Profile: IEEE-1588 (2008) ( Annex-J.3 Delay Request-Respond Default Profile: | Ordinary Clock – Server Ordinary Clock- Client (including slave only OC) Boundary Clock |
Profile: IEEE-1588 (2008) ( Annex-J.4 Peer-to-Peer: | Ordinary Clock – Server Ordinary Clock- Client (including slave only OC) Boundary Clock |
Profile: ITU-T G.8265.1 Telecom Profile for Frequency Synchronization: | Telecom Grandmaster Telecom Slave |
Profile: ITU-T G.8275.1 PTP Telecom Profile for Phase with Full timing Support: | Telecom Grandmaster (T-GM) Telecom Boundary Clock (T-BC) Telecom Time Slave Clock (T-TSC) |
Profile: ITU-T G.8275.2 PTP Telecom Profile for Phase with Partial timing Support: | Telecom Grandmaster (T-GM) Assisted / Partial Telecom Boundary Clock (T-BC) Assisted / Partial Telecom Time Slave Clock (T-TSC) |
Device Types: | Ordinary Clock Boundary Clock |
References Selection: | Default BMCA (Best Master Clock Algorithm) Alternate BMCA based on ITU G.781 – Synchronization layer functions for frequency synchronization based on the physical layer |
Transport Mappings: | PTP/UDP/IPv4 Annex D PTP/UDP/IPv6 Annex E PTP/Ethernet Annex F |
NIC TS (Time Stamp) granularity: | 1ns |
General Technical Specifications: STS3/ 8 Ports: P425G8TS81-XR |
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Interface Standard: | PCI-Express Base Specification Revision 4.0 (16 GTs) |
Board Size: | Single slot Standard height add-in card: 167.64mm X 111,15 mm(6.6”X 4.376”) |
PCI Express Card Type: | x16 Lane, bifurcation |
USB Connector: | uUSB |
Voltage: | +12V +/-8%, +12VAUX |
PCI Connector: | Gold Finger: x16 Lane |
Controllers: | 2xIntel E810-CAM1 |
1588/ SyncE PHY: | BCM81385 (8x25G) |
OCXO: | OX-2281-EAE-5000-20M000, 2 ppb, A1 |
DPLL: | 1588 / SyncE Microchip ZL30793, Si5315A-C-GM |
GNSS: | U-blox, ZED-F9T |
Network ports | 2xQSFP28/ QSFP |
Management port | RJ45 |
Holder: | Metal Bracket |
Power Consumption | Max: calculated: 50[w] |
Operating Temperature: | 0°C – 45°C (32°F – 113°F) |
Storage: | -40°C–65°C (-40°F–149°F) |
Regulation: | CE, FCC Class B, ROHS requirements. |
LEDs: | Ports 0-3: 4 LEDs Green Link/Act. Ports 4-7: 4 LEDs Green Link/Act. |
LEDs location: | Ports 0-3: On Metal Bracket, left to QSFP28 Ports 4-7: On Metal Bracket right to QSFP28 |
USB HUB | USB2514 – USB hub for 4 downstream ports |
FTDI USB TO RS232 | USB HS to QUAD UART/MPSSE |
QSFP28 25Gigabit Ethernet Technical Specifications Adapters:
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QSFP28 (Small Form Factor Pluggable) supports: | (x4) SFI interfaces supports 25GBase-R PCS and 25 Gigabit PMA in order to connect with QSFP to 25GBase-SR/ LR (MPO) |
25GBase-SR QSFP: IEEE Standard / Network topology: |
Fiber 25Gigabit Ethernet, 25GBASE-SR (850nM LAN PHY). 25.78125GBd MMF Multi-Mode fiber |
25GBase-LR QSFP: IEEE Standard / Network topology: |
Fiber 25Gigabit Ethernet, 25GBASE-LR (1310nM LAN PHY) 25.78125GBd (SMF) Single-Mode fiber : 10000m at 9um |
QSFP+/ SFP+ 10Gigabit Ethernet Technical Specifications Adapter:
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QSFP /SFP+ (Small Form Factor Pluggable) supports: | SFI interfaces supports 10GBase-R PCS and 10 Gigabit PMA in order to connect with QSFP to 10GBase-SR/ LR (MPO) |
10GBase-SR : IEEE Standard / Network topology: |
Fiber 10Gigabit Ethernet, 10GBASE-SR (850nM LAN PHY). 10.3125GBd MMF Multi-Mode fiber |
10GBase-LR IEEE Standard / Network topology: |
Fiber 10Gigabit Ethernet, 10GBASE-LR (1310nM LAN PHY) 10G.3125GBd (SMF) Single-Mode fiber: 10000m at 9um |
STS3 P425G8TS81 TimeSync Card
8 Ports 25 Gigabit Ethernet Grand Master, Boundary Clock, Slave Clock, PCIe GEN4 TimeSync card
P/N |
Description |
Notes |
P425G8TS81-XR | 2×4 Port QSFP 25/10 Gigabit Ethernet GM/ TimeSync PCI Express Server Adapter | STS3 ,x16 Gen4, bifurcation 2×8 G4, FHHL single slot |
P425G8TS81-SR | 2×4 Port QSFP 25/10 Gigabit (SR) Ethernet GM/ TimeSync PCI Express Server Adapter | x16 Gen4, bifurcation 2×8 G4, FHHL single slot |
TS-MB-F5-200X5 |
TimeSync SMA MB Kit, Full height,5xSMA,5x200mm cables | |
TS-MB-L5-200X5 | TimeSync SMA MB Kit, LP,5xSMA, 200mm cables |