CPAC-TR-40LR-QSFP10Km-D-BCC | Checkpoint Compatible 40GB Single-Mode 10km (40GBASE-LR4)

Q: Will this work in place of the Checkpoint CPAC-TR-40LR-QSFP10Km-D?
A: Yes. This transceiver is fully compatible with the Checkpoint CPAC-TR-40LR-QSFP10Km-D based on IEEE 802.3ba 40GBASE-LR4 compliance, identical QSFP+ form factor, and matching 40 Gbps data rate over single-mode fiber. It operates as a plug-and-play replacement in Checkpoint platforms requiring this specification.

Q: Which Checkpoint appliances support this transceiver?
A: This module is compatible with Checkpoint security appliances featuring QSFP+ 40G ports, including the 9700, 9800, 19200, and 29000 series, as well as Maestro MHO140, MHO170, and MHO175 platforms. Verify your appliance has QSFP+ ports and supports 40GBASE-LR4 optics.

Q: Why does 40GBASE-LR4 use four wavelengths instead of a single laser?
A: LR4 uses CWDM (coarse wavelength division multiplexing) to split the 40G signal into four parallel 10G lanes, each transmitted on a distinct wavelength (1271, 1291, 1311, 1331 nm). This approach extends reach to 10km while using only two fibers (duplex LC), whereas a single 40G lane would face signal integrity limits at this distance.

Q: What is the minimum fiber quality required for reliable 10km operation?
A: OS2 single-mode fiber (9/125 µm) is required. The module provides approximately 9.7 dB link budget. Total link loss (fiber attenuation plus splice and connector losses) must remain within this budget. Typical OS2 attenuation is 0.4 dB/km at 1310 nm, allowing margin for connectors and patch panels in a 10km span.

Q: Can I use DOM to verify all four CWDM lanes are functioning correctly?
A: Yes. The transceiver provides per-lane transmit and receive optical power monitoring via the DOM interface. By querying the I2C registers, you can confirm that all four wavelengths (lanes) are within operational thresholds. Asymmetric lane power or a missing lane indicates potential fiber issues, dirty connectors, or transceiver faults.