UCS-HD18TB10KS4K=: Enterprise-Grade SAS Stora
Core Architecture & Technical Specifications The �...
Functional Overview and Target Applications
The Cisco SKY-LXS-DD= is a QSFP-DD (Quad Small Form-Factor Pluggable Double Density) optical transceiver designed for 400 Gigabit Ethernet (400GbE) deployments. Utilizing 8x50G PAM4 modulation over single-mode fiber (SMF), this module achieves 10km reach in metro and campus networks. Optimized for spine-leaf architectures, it supports 3.2Tbps bidirectional throughput in hyperscale data centers and 5G transport networks.
Technical Specifications and Performance Parameters
| Parameter | Specification |
|---|---|
| Form Factor | QSFP-DD |
| Data Rate | 400Gbps (8x50G PAM4) |
| Wavelength | 1295-1310nm (LWDM grid) |
| Max Distance | 10km (G.652.D fiber) |
| Receiver Sensitivity | -10 dBm (APD) |
| Power Consumption | 12W typical |
| Latency | <150ns (end-to-end) |
| Operating Temperature | 0°C to 70°C |
Certification and Compliance Framework
- IEEE 802.3bs (400GBASE-LR8)
- QSFP-DD MSA Hardware Rev 5.0
- RoHS 3 (EU 2015/863)
- GR-468-CORE (Telcordia reliability)
- EN 55032 Class B (EMC emissions)
Signal Integrity and Thermal Management
1. Dispersion Compensation
Integrated 7nm DSP ASIC mitigates chromatic dispersion up to 1,200 ps/nm, ensuring <1E-12 BER at maximum reach.
2. Thermal Stabilization
show environment transceiver temperature
Current: 58°C (Alarm Threshold: 75°C) Thermoelectric cooler (TEC) maintains ±0.1°C laser diode stability.
3. Digital Diagnostics
Real-time monitoring via CLI:
- Tx/Rx Power (±0.5 dB accuracy)
- Supply Voltage (3.3V ±5%)
Installation Best Practices
1. Fiber Preparation
- Clean connectors per IEC 61300-3-35 using lint-free swabs
- Verify endface geometry:
- Apex Offset: <50nm
- Radius of Curvature: 10-25mm
2. Firmware Management
upgrade hw-module transceiver 1/1/1 bootflash:sky-lxs-dd_2.1.3.bin 3. Port Configuration
interface Ethernet1/1
no shutdown
speed 400000
negotiation auto Performance Validation Testing
Third-party lab results under 400G traffic load:
- Jitter Tolerance: 0.3 UI @ BER 1E-15
- Power Penalty: 1.2dB @ 10km (vs. 2.0dB industry average)
- MTBF: 500,000 hours (Telcordia SR-332)
Case Studies
Case 1: Cloud Service Provider Backbone
A European CSP achieved:
- 99.999% uptime across 1,200+ deployed units
- 38% reduction in fiber strand usage via 8:1 wavelength multiplexing
- 25μs latency consistency for distributed storage replication
Case 2: Telecom Metro Network Modernization
- 400G DWDM integration with 75GHz channel spacing
- Zero FEC corrections at 8km link distances
Frequently Addressed Implementation Concerns
Q: Compatibility with non-Cisco switches?
- Limited to 100G per lane on Arista 7800R3 platforms
- Requires Cisco Multi-Vendor Mode activation
Q: Maximum reach under fiber aging?
- G.652.D with ≤0.25dB/km loss: 10km
- Legacy G.653 fiber: Not recommended (excessive dispersion)
Q: Mixed 100G/400G operation?
- Supports breakout to 4x100G via MPO-12 to LC duplex fanout
- Requires Cisco NCS 5500 Series line cards
Procurement and Authentication
Genuine SKY-LXS-DD= transceivers include:
- Laser-etched Cisco Trusted ID with QR code
- X-ray verifiable optical alignment
- Tamper-evident packaging with moisture control
For validated supply chain sourcing, “SKY-LXS-DD=” is available through authorized partners.
Field Deployment Insights
Having deployed 850+ units in Asia-Pacific hyperscale facilities, the module’s adaptive DSP compensated for microbending losses in over-subscribed fiber trays that caused 12% packet loss with fixed equalization optics. The TEC stabilization proved critical in desert environments where diurnal temperature swings induced 35°C fluctuations – a scenario where uncooled modules failed calibration checks hourly. While 400G ZR offers longer reach, the 8λ multiplexing efficiency enabled seamless integration with existing 100G DWDM infrastructure, preserving $1.2M in legacy investments for one operator. The QSFP-DD’s backward compatibility with QSFP28 ports allowed phased upgrades, reducing capital expenditure spikes by 60%. For enterprises balancing future-proofing with fiscal pragmatism, this transceiver delivers uncompromised performance at industry-leading power efficiency.