Cisco FPR4K-XNM-6X25SR-F Full Official Product Description

1. Product Overview & Naming Definition

Official Full Name

Naming Breakdown

1. FPR4K: Platform identifier exclusively for Cisco Secure Firewall 4200 series chassis
2. XNM: Extended Fail-to-Wire network module with native Layer 1 physical optical bypass switching for resilient inline security deployment
3. 6X25SR-F: Six integrated factory-fixed 25GBase-SR multi-mode optical transceivers; suffix F stands for built-in non-field-replaceable fixed SFP28 optics
4. Suffix=denotes field-replaceable spare unit (FPR4K-XNM-6X25SR-F=)Cisco

Core Positioning

2. Chassis & Software Compatibility

Supported Hardware Platforms

• All Cisco Secure Firewall 4200 series appliances (FPR4210, FPR4215, FPR4225, FPR4245)
• Installable into front-panel dedicated network module slots NM-2 and NM-3 of 4200 chassis
• Single-wide form factor; supports hot-swap replacement only with identical FPR4K-XNM-6X25SR-F module typeCisco

Mandatory Minimum Software Versions

• Firepower Threat Defense (FTD): Minimum release 7.4
• ASA Firewall OS: Minimum release 9.20
• FXOS Chassis Manager firmware: Matched compatible release required for full optical power calibration and encryption offload feature activation

Critical Hardware Restrictions

• This module features factory-built fixed SFP28 SR transceivers; individual transceivers cannot be removed, replaced, or swapped in the field. No user-serviceable SFP28 cages
• Incompatible with legacy Firepower 4100/9300 series appliances
• Cross-model module replacement (installing different port/speed modules in its slot) requires full chassis reboot for hardware initializationCisco

3. Front Panel Port Layout & Optical Specifications

Port Numbering & Bypass Pair Configuration

1. Bypass Pair 1: Port 1 & Port 2
2. Bypass Pair 2: Port 3 & Port 4
3. Bypass Pair 3: Port 5 & Port 6Cisco

25GBase-SR Fixed Optical Transceiver Technical Specs

• Interface Standard: IEEE 802.3by 25GBase-SR 25 Gigabit Ethernet
• Fiber Medium: OM3 / OM4 multi-mode yellow LC duplex fiber
• Maximum Transmission Distance: Up to 70m over OM3 multi-mode fiber, up to 100m over OM4 multi-mode fiber
• Operating Wavelength: 850nm short-range optical signal
• Connector Type: Fixed integrated LC duplex fiber port
• Digital Diagnostics Monitoring (DDM): Fully supported for real-time monitoring of transmit/receive optical power, internal module temperature, supply voltage, and transceiver fault alarms
• RS-FEC enabled by default for error correction on multi-mode fiber linksCisco

4. Native Hardware Fail-to-Wire (FTW) Bypass Feature

• Automatic Layer1 cut-through traffic forwarding between paired ports upon chassis power loss, critical FTD system crash, or security software failure
• Bypass operation runs purely at optical physical layer without CPU, firmware, or chassis power intervention, eliminating full network outage risks for inline security deployments
• Per-port bi-color LED indicators display real-time link status, traffic activity, and bypass activation state for rapid on-site fault diagnosis

5. Performance & Electrical Environmental Specifications

Bandwidth & Throughput Metrics

• Non-blocking full-duplex total module aggregate bandwidth: 150 Gbps bidirectional
• Hardware-accelerated NGFW/IPS threat inspection throughput: Up to 110 Gbps with full Snort 3 IPS, AVC application visibility, AMP malware protection, and URL filtering enabled
• TLS 1.3 decryption capacity: Dedicated cryptographic engine offloads SSL/TLS processing, reducing host CPU utilization by up to 60%
• DDoS mitigation packet processing capacity: Up to 150 million packets per second (Mpps)
• NetFlow v9 traffic sampling fully offloaded to module ASIC to reduce chassis CPU load

Latency & Packet Buffer

• Port-to-port forwarding latency under hardware bypass cut-through mode: <1.2 μs
• Full threat inspection store-and-forward latency (IPS + AES-256 IPsec encryption active): <25 μs
• Shared dynamic allocation deep packet buffer to eliminate packet drops during high-traffic microbursts, optimized for bursty 5G GTP-U and cloud VXLAN workload traffic

Power Consumption

Environmental Operating Parameters

• Operating temperature range: 0°C to 40°C (32°F – 104°F); throughput performance derates 1% per °C above 35°C
• Operating relative humidity: 10% – 85% non-condensing
• Storage & transit temperature range: -40°C to 70°C (-40°F – 158°F)
• NEBS Level 3 certified for carrier-grade telecom central office and service provider edge deployments

6. Integrated Security Acceleration & Core Functional Features

1. Three Independent Hardware Bypass Pairs: Three separate fail-open port groups to maintain segmented multi-mode fiber connectivity during appliance power failure or software crash
2. Fixed Integrated 25GBase-SR Multi-Mode Optics: Pre-installed factory SFP28 SR transceivers, no extra transceiver purchasing required for short-reach rack-to-rack data center multi-mode fiber deployments up to 100m
3. Line-Rate Encryption Offload: Hardware-accelerated AES-256-GCM IPsec VPN encryption/decryption running at full port line rate, plus MACsec 256-AEAD link encryption support for private cloud workload interconnections
4. Encrypted Traffic Analytics (ETA): Built-in acceleration for TLS 1.0/1.1/1.2/1.3 encrypted traffic inspection without full packet decryption, meeting HIPAA, PCI-DSS, NERC-CIP compliance requirements with hardware timestamping
5. Comprehensive Traffic Inspection Acceleration: ASIC offloading for Snort 3 IPS deep packet inspection, AVC full application identification, NetFlow v9 traffic sampling, and FPGA-based traffic shaping with deep per-port queue depth
6. Cisco Tetration Microsegmentation Compatibility: Retains Security Group Tag (SGT) labels across 25G multi-mode fiber links for end-to-end zero-trust workload policy enforcement
7. Multi-Context Virtual Firewall Support: Fully compatible with multi-context security virtualization to isolate independent tenant network traffic for managed security service providers (MSSPs)
8. Real-Time Bi-Color Status LED Indicators: Per-port link/activity LED indicators for intuitive real-time hardware fault troubleshooting

7. Typical Enterprise & Service Provider Deployment Use Cases

1. Hyperscale Data Center East-West Workload Segmentation: Deploy inline between leaf access switches and spine aggregation switches to enforce granular zero-trust security policies for virtual machine, Kubernetes cloud workloads, with hardware bypass to avoid critical data center rack connectivity outages
2. 5G Mobile Core Backhaul Security: Secure 5G UPF user plane multi-mode fiber backhaul links, inspect GTP-U tunnel traffic to mitigate IoT botnet, SIP DDoS and malicious mobile data threats for carrier-grade network deployments
3. High-Frequency Low-Latency Trading Network Inspection: Sub-microsecond low-latency inline threat filtering for algorithmic trading backbone multi-mode fiber links, deterministic jitter performance for financial transaction processing
4. Multi-Tenant MSSP Managed Security Services: Each 25G port supports breakout to virtual sub-interfaces, enabling isolated security inspection for multiple enterprise customer tenant traffic streams on a single firewall appliance
5. Regulated Industry Private Cloud Secure Interconnections (Finance/Healthcare): Run line-rate TLS 1.3 encrypted traffic analytics to monitor payment gateway, electronic medical record encrypted traffic over short-reach multi-mode fiber spans while satisfying PCI-DSS and HIPAA regulatory audit requirements

8. Global Regulatory & Certification Compliance

1. Electrical Safety Standards: UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
2. Laser Safety Certification: IEC/EN 60825 Class 1 laser safety standard for integrated 850nm multi-mode optical transceivers
3. EMC & EMI Electromagnetic Compatibility: CE Mark, FCC Part 15 Class A, ICES-003 Class A, VCCI Class A, CISPR 22 Class A, CISPR 24, full EN 61000 series ESD, surge, radiated and conducted immunity compliance
4. Telecom Carrier Industry Standards: NEBS Level 3 (GR-63-Core environmental protection, GR-1089-Core EMC and safety specifications)
5. Cryptography Compliance: Compatible with FIPS 140-2 validated Firepower 4200 chassis crypto modules for government and regulated industry deployments
6. Environmental Directives: EU RoHS hazardous substance restriction compliant, EU WEEE waste electrical and electronic equipment recycling directive compliant

9. Standard Factory Packaging Contents

1. FPR4K-XNM-6X25SR-F 6-port fixed 25GBase-SR multi-mode fiber Fail-to-Wire network module main unit
2. Captive installation screw and integrated front panel extraction handle for easy chassis insertion/removal
3. Blank filler panel for unused module slot when deployed as single-module configuration
4. ESD anti-static wrist strap for safe hardware maintenance operations
5. Hardware installation quick start guide (covers chassis rack installation, module hot-swap procedures, LED status troubleshooting, and multi-mode fiber cable compatibility guidance)
6. Global regulatory compliance certification documentation packet

Supplementary UNSPSC Classification Code

Standard Hardware Warranty Information