ISM321B-20 - TP-Link 1000Base-BX WDM Bi-Directional Industrial SFP Module
Description
Description
The TP-Link ISM321B-20 is a 1000Base-BX WDM Bi-Directional Industrial SFP Module built for reliable gigabit fibre links in demanding environments. Using WDM (Wavelength Division Multiplexing) technology, it carries traffic in both directions over a single strand of single-mode fibre, helping to cut cabling costs on long runs while delivering up to 20 km of reach.
Unlike standard commercial SFP modules rated for 0-70°C, the ISM-series industrial range is designed for environments with temperature extremes, with an industrial operating temperature range of -40 to 85°C. This makes the ISM321B-20 a sound choice for factory, outdoor and transportation deployments where standard hardware could degrade.
Key Features
- 1000Base-BX WDM bi-directional transmission over a single fibre strand
- 1x Gigabit LC port with single-mode fibre support
- Up to 20 km transmission distance
- Supports Digital Diagnostic Monitoring (DDM) for monitoring module health
- Hot swappable for straightforward installation and replacement
- Industrial operating temperature range of -40 to 85°C
- Designed to be paired with its ISM321A-20 counterpart module at the opposite end of the link
Single-fibre WDM connectivity
The 1000Base-BX standard sends and receives at different wavelengths on the same fibre. This halves the fibre needed compared with a conventional two-strand link, which is particularly valuable on long runs or where only one fibre is available.
Monitoring with DDM
With Digital Diagnostic Monitoring, compatible switches can report operating parameters of the inserted SFP module, such as temperature, voltage, bias current and TX/RX optical power. This helps with proactive maintenance and fault-finding on critical links.
Ideal for: network integrators, IT managers and system designers deploying industrial Ethernet, outdoor, factory-floor or transportation networks that need long-distance single-fibre gigabit links in wide-temperature conditions.
Compatible Products
The ISM321B-20 is designed to work as a pair with the TP-Link ISM321A-20 1000Base-BX WDM Bi-Directional Industrial SFP Module. It is intended for use in gigabit SFP slots on TP-Link Omada switches, including the Omada Industrial Easy Managed Switch range, which supports DDM monitoring of inserted SFP modules.
Compatible Products note: TP-Link recommends using TP-Link SFP modules with TP-Link devices. Please confirm that your switch has a gigabit SFP slot before purchase.
Frequently asked questions5 questions
What is the TP-Link ISM321B-20 used for?
How far can this SFP module transmit?
What wavelengths does it use, and how should it be paired?
Is the ISM321B-20 suitable for harsh or outdoor-style environments?
Does it support hot-swapping and diagnostics?
Payment & Security
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