# Enables High-Precision IEEE1588v2 and SyncE Support

# Clock Card CLK-100

# Datasheet

![DAPU\nCM55F-Y129\n10.00MHz\n2221](.datasheet-clock-card-clk-100-20220816/e22192508dffcc2f48af2327071893ca62ed9d6b676e96fc9e0acb213015f8f3.jpg)

# Features

• Small footprint in OCP NIC 2.0 form factor
• Supports IEEE1588 v2 to provide time and frequency synchronization
• Supports SyncE to provide frequency synchronization
• Supports external clock input from an external local source
• 24h or 8h hold-over clock capability to sustain clock accuracy

Specifications

<table><tr><td rowspan="3">Key Module</td><td>GNSS</td><td>Ublox NEO-M8T concurrent GNSS modulesActive antenna usedSupports GPS, Galileo, GLONASS and BeiDou signalsPhase accuracy 20ns</td></tr><tr><td>OCXO</td><td>(SKU1) Dapu CM55F-Z129-10.00Mhz with holdover: ±1.5μs/24h @ △T=±10°C;Temperature Stability: ±0.2ppb(SKU2) Dapu CM22B-G328-10.00MHz with holdover: ±1.5μs/8h @ △T=±10°C;Temperature Stability: ±0.3ppb</td></tr><tr><td>PLL</td><td>Silicon Labs Si5383 basedThree DSPLLs can function independentlySynchronous Ethernet (SyncE) ITU-T G.8262IEEE 1588 (PTP) master/slave clock synchronization</td></tr><tr><td>LEDs</td><td></td><td>Onboard 1x LED indicator for OCXO lockOnboard 3x LED indicators for PLL lock</td></tr><tr><td rowspan="2">I/O Interfaces</td><td>Motherboard</td><td>GNSS antenna SMA headerExternal PPS input from motherboardSyncE input/output from/to motherboardIEEE1588 clock/PPS/TOD output to motherboard</td></tr><tr><td>Onboard</td><td>DIP switch to change PPS source1x PPS MMCX output header1x PPS MMCX input header1x 10M MMCX output header1x 8-pin header for GNSS PPS/TOD and PLL I2C</td></tr></table>

Specifications

<table><tr><td>Temperature and Humidity</td><td>Operating: -5°C to +55°C, 10%-85% RH @40°C, non-condensingStorage: -40°C to +70°C, 5%-90% RH, non-condensing</td></tr><tr><td>Mechanical and Environmental</td><td>Form Factor: 68mm x 82mmPower: 5V</td></tr></table>

Block Diagram
![**Blocks:**\n*   **PLL**: Contains labels `Out0_P/N`, `Out1_P/N`, `INTR_NN`, `In1_P/N`, `Out5`, `Out3`, `In3`, and `Ref`.\n*   **OCXO**\n*   **PPS_IN_SW**\n*   **Locked LEDs**\n*   **GNSS**: Contains labels `1PPS`, `TOD`, and `I2C`.\n\n**Connections:**\n*   **GPS** (circle symbol) connects to **GNSS**.\n*   **GNSS** `1PPS` connects to the bottom input of **PPS_IN_SW**.\n*   **GNSS** `TOD` connects to an output arrow labeled **To CPU**.\n*   **GNSS** `I2C` connects to an output arrow labeled **To BMC**.\n*   **PPS_IN_SW** has three inputs:\n    *   Top arrow labeled **1PPS From MB**.\n    *   Middle circle connector labeled **MMCX**.\n    *   Bottom input from **GNSS**.\n*   **PPS_IN_SW** output connects left to **OCXO**.\n*   **OCXO** connects to **PLL** via two lines:\n    *   Red arrow labeled **In3**.\n    *   Purple arrow labeled **Ref**.\n*   **PLL** connects to external lines:\n    *   **Out0_P/N** connects to **1588 Ref CLK**.\n    *   **Out1_P/N** connects to **SyncE Ref CLK**.\n    *   **INTR_NN** connects to **INTER to NIC**.\n    *   **In1_P/N** receives input from **SyncE Rec CLK**.\n    *   **Out5** connects to a circle connector labeled **1 PPS** and **MMCX**.\n    *   **Out3** connects to a circle connector labeled **10M**.](.datasheet-clock-card-clk-100-20220816/8f112856b20f3d4ac8a48d4b0d2078cc4998ddd250a738574552704d571cff12.jpg)
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