> Source: [sk183236](https://support.checkpoint.com/results/sk/sk183236)

# sk183236 - Check Point transceiver CPAC-TR-100SR-BiDi does not link with Cisco transceiver QSFP-40/100-SRBD

| Property | Value |
|----------|-------|
| Solution ID | sk183236 |
| Date Created | 2025-03-11 |
| Last Modified | 2025-04-14 |
| Technical Level | General |
| Products | Hardware |
| Versions | Not Version-Specific |
| OS | Gaia |

## Symptoms

- Failure to establish a link between the Check Point transceiver CPAC-TR-100SR-BiDi (in Quantum Force Appliance models 9000, 19000, 29000, and Orchestrator MHO-175) and the Cisco transceiver QSFP-40/100-SRBD.

## Cause

The CPAC-TR-100SR-BiDi protocol is incompatible with the Cisco proprietary QSFP-40/100-SRBD protocol.

|-------------------------|---------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------|
| Item                    | Check Point CPAC-TR-100SR-BiDi                                                                                                        | Cisco QSFP-40/100-SRBD                                                                                                                           |
| Industry Standard       | IEEE 802.3m-2015                                                                                                                      | Proprietary (non-IEEE)                                                                                                                           |
| Modulation              | Uses Pulse-Amplitude Modulation 4-level (PAM4) for 100Gbps mode, which allows for higher data rates by encoding more bits per symbol. | Uses Non-Return-to-Zero (NRZ) modulation for 40Gbps and 100Gbps modes.                                                                           |
| Technology              | Uses the Bi-Directional (BiDi) technology with PAM4 modulation, enabling efficient data transmission at 100Gbps.                      | Uses the Bi-Directional (BiDi) technology, allowing data transmission and reception on the same fiber using different wavelengths.               |
| Center Wavelength Line0 | 850nm                                                                                                                                 | 850nm                                                                                                                                            |
| Center Wavelength Line1 | 900nm                                                                                                                                 | 900nm                                                                                                                                            |
| Connector Type          | Duplex LC connectors                                                                                                                  | Duplex LC connectors.                                                                                                                            |
| Reach                   | Typically supports up to 100m on OM4 multimode fiber.                                                                                 | Supports up to 100m on OM3 and 150m on OM4 multimode fiber in 40Gbps mode, and up to 70m on OM3 and 100m on OM4 multimode fiber in 100Gbps mode. |

## Solution

These options are available to address the incompatibility between the Check Point transceiver CPAC-TR-100SR-BiDi and the Cisco transceiver QSFP-40/100-SRBD:

* The Check Point transceiver CPAC-TR-100SR-BiDi is fully compatible with the Cisco transceiver QSFP-100G-SR1.2

* The Quantum Force Appliance models 9000, 19000, 29000, and Orchestrator MHO-175 support the Cisco transceiver QSFP-40/100-SRBD installed in these appliances.

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