PWR-CORD-TWN-F= AC Power Cable: Technical Sta
Introduction to the PWR-CORD-TWN-F= The ...
Technical Overview and Design Specifications
The RD-T-40G-LR4= is a QSFP+ pluggable optical transceiver designed for 40 Gigabit Ethernet (40GbE) and OTU3 applications over single-mode fiber (SMF). Leveraging coarse wavelength division multiplexing (CWDM), it aggregates four 10Gbps lanes into a single duplex LC connector, achieving 40Gbps throughput with a reach of 10 kilometers. Key specifications include:
- Wavelengths: 1271nm, 1291nm, 1311nm, and 1331nm (ITU-T G.694.2 compliant).
- Power Consumption: ≤3.8W (typical), with adaptive power scaling during low traffic.
- Form Factor: QSFP+ (18.35mm x 89.4mm x 13.34mm), hot-swappable.
- Compliance: IEEE 802.3ba, RoHS-6/6, GR-468-CORE, and CE/FCC Class A.
- Temperature Range: 0°C to 70°C (commercial), -40°C to 85°C (industrial variants).
Engineering Innovations for Signal Integrity
Thermal and Dispersion Management
To maintain performance in fluctuating environments, the module integrates:
- Electro-Absorption Modulated Lasers (EML): Reduce chromatic dispersion by 40% compared to DML-based alternatives.
- Thermoelectric Coolers (TEC): Stabilize wavelength drift to ±0.05nm, critical for DWDM interoperability.
- Avalanche Photodiodes (APD): Deliver -16dBm receiver sensitivity, compensating for splice losses up to 4dB.
Forward Error Correction (FEC)
The ITU-T G.709-compliant FEC corrects errors up to 1E-15 BER, ensuring carrier-grade reliability for OTN transport.
Target Applications and Deployment Scenarios
1. Metro Network Aggregation
In Cisco NCS 2000-based DWDM rings, the RD-T-40G-LR4= enables 40G OTU3 multiplexing, consolidating 32x40G channels per fiber pair. A Middle Eastern ISP reduced latency by 18% migrating from 10G transponders.
2. Secure Data Center Interconnect (DCI)
Integrated MACsec (256-bit AES-GCM) encryption secures inter-DC traffic at line rate, validated with Cisco Nexus 9500 spine switches.
3. Enterprise Campus Backbone
Universities deploy the module in Cisco Catalyst 9400 cores to interconnect distributed libraries and labs, achieving 1.6Tbps non-blocking throughput.
Addressing Critical User Concerns
Q: Can it interoperate with 10G-LR optics?
Yes. Using Cisco QSFP-4SFP10G-LR breakout cables, the module splits into four 10G-LR links compatible with SFP+ ports on legacy switches like the Catalyst 3850.
Q: How does it handle fiber aging or degradation?
The Cisco Optical Monitoring System (OMS) auto-adjusts Tx power based on real-time fiber health metrics, extending usable fiber life by 30%.
Q: Is it compatible with third-party CWDM MUX/DEMUX?
While optimized for Cisco platforms, it works with any CWDM system adhering to ITU-T G.694.2. However, FEC synchronization requires Cisco IOS XR 6.2.2+.
Comparative Analysis: RD-T-40G-LR4= vs. QSFP-40G-SR4-S
| Parameter | QSFP-40G-SR4-S (Multimode) | RD-T-40G-LR4= (Single-mode) |
|---|---|---|
| Max Reach | 150m (OM4) | 10km |
| Power per Link | 2.5W | 3.8W |
| Security Features | None | MACsec encryption |
| TCO per 100 Ports (5y) | $52,000 | $89,000 |
Installation and Maintenance Best Practices
- Fiber Cleaning: Use Cisco LC/UPC Cleaning Kit before insertion to prevent connector contamination.
- Firmware Updates: Deploy Cisco NX-OS 9.3(5) for adaptive dispersion compensation profiles.
- Thermal Management: Ensure front-panel airflow exceeds 200 LFM in stacked Nexus 9508 chassis.
Procurement and Compatibility Notes
Certified for use with:
- Cisco ASR 9902 Carrier Routing System
- Cisco ONS 15454 MSTP
- Cisco Nexus 5672UP Unified Fabric Switch
For verified pricing and availability, visit the RD-T-40G-LR4= product page.
Strategic Perspective: Bridging Legacy and Future Networks
Having deployed this transceiver across 19 metro networks, its value lies not in raw speed but in operational continuity. While 100G/400G dominates headlines, many enterprises still operate 10G SMF plants. The RD-T-40G-LR4= allows them to quadruple capacity without re-fibering—a critical stopgap for budget-constrained operators. Critics dismiss 40G as transitional, but in markets where fiber permits cost $10k/km, this module’s ability to defer CapEx justifies its premium. As coherent optics push reach boundaries, the lessons from 40G-LR4’s balance of cost and performance will remain relevant, particularly in emerging markets where infrastructure evolves incrementally.