Introduction to the Cisco CWDM-SFP-1590=

The ​​Cisco CWDM-SFP-1590=​​ is a pluggable optical transceiver module designed for ​​Coarse Wavelength Division Multiplexing (CWDM)​​ networks. Based on aggregated data from Cisco.com, Bing.com, and Yahoo.com, this module operates on the ​​1590 nm wavelength​​ and is tailored for cost-effective, high-capacity fiber optic communication in enterprise, metro, and data center environments.

Technical Specifications and Key Features

The CWDM-SFP-1590= adheres to the ​​ITU-T G.694.2​​ CWDM grid standard, with the following core attributes:

• ​​Data Rate​​: Supports ​​1.25 Gbps​​ for Gigabit Ethernet, Fiber Channel, or SONET/SDH protocols.
• ​​Reach​​: Up to ​​80 km​​ using single-mode fiber (SMF) with a typical ​​dB loss budget of 21 dB​​.
• ​​Temperature Range​​: Operates at ​​commercial (0°C to 70°C)​​ temperatures, making it unsuitable for industrial extremes.
• ​​Compatibility​​: Works with Cisco Catalyst 3560, 3750, 4500, and 6500 Series switches, as well as ASR 9000 routers.

Primary Applications and Deployment Scenarios

1. Enterprise Network Backbone Expansion

The module enables organizations to ​​multiplex multiple data streams​​ over a single fiber pair, reducing cabling costs in campus LANs or multi-building networks.

2. Metro-Access Networks

Telecom operators use the 1590 nm channel to ​​extend service reach​​ in metro rings without deploying additional fiber, often pairing it with OADM nodes like the Cisco CWDM-OADM4-1=.

3. Data Center Interconnects (DCI)

By isolating backup or disaster recovery traffic on the 1590 nm wavelength, data centers avoid contention with primary production data on other CWDM channels (e.g., 1470 nm or 1510 nm).

Addressing Critical User Questions

Q: How does the CWDM-SFP-1590= differ from other CWDM SFPs (e.g., 1470 nm or 1610 nm)?

• ​​Wavelength Isolation​​: The 1590 nm channel minimizes interference with adjacent wavelengths like 1570 nm or 1610 nm, crucial in dense CWDM setups.
• ​​Use Case Focus​​: Unlike shorter wavelengths (e.g., 1470 nm), the 1590 nm module is optimized for ​​medium-haul metro links​​ rather than short campus runs.

Q: Is this module hot-swappable?

Yes. The CWDM-SFP-1590= supports ​​hot-swapping​​ in compatible Cisco devices, enabling maintenance without network downtime.

Q: Can it be used in DWDM systems?

No. The module is designed exclusively for ​​CWDM grids​​. For DWDM (Dense WDM), Cisco offers alternatives like the DWDM-SFP-XXXX= series.

Performance and Limitations

Testing reveals the CWDM-SFP-1590= achieves ​​<10^-12 BER (Bit Error Rate)​​ at 80 km with standard SMF-28 fiber. However, its ​​lack of tunability​​ limits flexibility compared to DWDM modules. Key constraints include:

• ​​Fixed Wavelength​​: Cannot be reconfigured for other CWDM/DWDM channels.
• ​​Power Sensitivity​​: Requires precise optical power levels (-3 dBm to -12 dBm) to avoid receiver saturation or signal degradation.

Procurement and Compatibility Notes

For guaranteed compatibility, [“CWDM-SFP-1590=” link to (https://itmall.sale/product-category/cisco/) offers Cisco-certified modules with DOM (Digital Optical Monitoring) support. Pair with ​​LC/UPC duplex fiber patches​​ to maintain signal integrity.

Final Assessment

The CWDM-SFP-1590= is a niche yet vital tool for networks prioritizing wavelength efficiency over flexibility. While its fixed 1590 nm operation may seem restrictive, this specificity simplifies deployment in standardized CWDM architectures. For teams managing metro expansions or multi-site enterprises, this module strikes a balance between performance and cost—provided its limitations align with the project’s scope.