Cisco 15540-TSP1-25B3 Ch 25/26 Transponder Module

Overview
The Cisco Ch 25/26 Transponder Module (part number 15540-TSP1-25B3) is a high-performance optical transponder designed for modern carrier and data center networks. It delivers reliable 25/26 Gbps per wavelength transmission over single-mode fiber, enabling efficient scaling of bandwidth while maintaining low power consumption and compact form factor.

Key Features

• Supports 25 Gbps and 26 Gbps data rates per channel
• Four wavelength (lambda) ports per module for flexible channel aggregation
• Hot-swappable design for zero-downtime maintenance
• Advanced forward error correction (FEC) for improved signal integrity
• Low power consumption and reduced heat dissipation
• Built-in monitoring and diagnostics via Cisco IOS XE

Technical Specifications

• Data rate: 25.78125 Gbps per lambda
• Number of lambdas: 4
• Optical reach: up to 120 km over standard single-mode fiber (OSM) with appropriate amplification
• Wavelength range: 191.5 THz to 196.1 THz (C band)
• Transmit power: -3 dBm typical
• Receive sensitivity: -23 dBm (BER 1e-12)
• Power supply: 12 V DC, 2.5 A max
• Dimensions: 1.75 in (H) x 2.0 in (W) x 0.5 in (D)
• Operating temperature: 0 to 45 degrees C
• Compliance: RoHS, FCC Part 15 Class B

Applications

• Metro Ethernet and carrier Ethernet aggregation
• Data center interconnect (DCI) for high-speed server clustering
• Long-haul and regional transport networks requiring high spectral efficiency
• Cloud service provider backbones and edge connectivity
• Enterprise WAN extensions with demanding bandwidth requirements

By integrating the Cisco Ch 25/26 Transponder Module into your optical transport platform, you gain a scalable solution that maximizes fiber utilization, simplifies network upgrades, and ensures continuous high-capacity service delivery.