TP-Link SM321A 1000Base-BX WDM Bi-Directional SFP Module 1.25Gbps 10KM
SKU: SM321A-VER4Networking › Network Accessories
฿467
Price includes 7% VATPrice updated November 1, 2026
In stock2 unitsManufacturer's warranty
For orders placed before 12:00 on a business day; weekends excluded
GenuineFree delivery from ฿5,000Tax invoice
Dual-fiber WDM SFP module that enables data transmission up to 10 kilometers over a single fiber, supports hot swapping and DDM for real-time status monitoring
Key features
- Transmits data in both directions over a single fiber, saving fiber cables
- Maximum transmission distance of 10 km on Single-Mode fiber
- Supports DDM for real-time status monitoring
- Hot-swappable module
- Compatible with TP-Link T-series switches and MC220L
Product description
TP-Link SM321A module is a network accessory that uses WDM Bi-Directional technology, enabling bidirectional data transmission over a single fiber by using different wavelengths in each direction, significantly reducing fiber optic cabling costs. This module supports a maximum speed of 1.25 Gbps and can transmit signals up to 10 kilometers on Single-Mode fiber with a size of 9/125 μm. It works efficiently with TP-Link switches such as T3700, T2700, T2600, T2500, T1700, T1600, T1500, 2/3/5 Series, and MC220L, featuring DDM (Digital Diagnostic Monitoring) for real-time operational status monitoring and supports hot swapping, allowing module replacement or system maintenance without network downtime.
More features
- Supports IEEE 802.3z standard
- Compact size, lightweight, easy to install
- Operates reliably at temperatures up to 70°C
- Supports storage temperatures from -40°C to 85°C
- Uses 3.3V power, energy efficient
Specifications (22)
- DDM
- Yes
- SFP-MSA
- Yes
- Standard
- IEEE 802.3z, CSMA/CD, TCP/IP
- Data Rate
- 1.25 Gbps
- Port Type
- LC/UPC
- Cable Type
- Single-Mode Fiber
- Dimensions
- 2.2 x 0.6 x 0.5 in (55.4 x 14.6 x 12.9 mm)
- Fiber Type
- 9/125 μm Single-Mode
- Paired With
- TL-SM321B or CM112CM
- Wave Length
- TX: 1550 nm, RX: 1310 nm
- Power Supply
- 3.3 V
- Compatibility
- Compatible with T3700 series, T2700 series, T2600 series, T2500 series, T1700 series, T1600 series, T1500 series, 2/3/5 series switches, MC220L
- Hot Swappable
- Yes
- Connector Type
- LC Simplex
- Max Cable Length
- 10 KM
- Storage Humidity
- 5–90% RH, Non-Condensing
- Safety & Emission
- FCC, CE
- Operating Humidity
- 10–90% RH, Non-Condensing
- Storage Temperature
- -40–85 °C (-40–185 °F)
- Environmental Rating
- Industrial-grade operating and storage conditions
- Standards Compliance
- IEEE 802.3z, CSMA/CD, TCP/IP
- Operating Temperature
- 0–70 °C (32–158 °F)
Datasheets and manuals straight from the manufacturer — select a document to open or download it.
9 questions
Frequently asked questions about this product
Compiled from manufacturer information
Which switch models is this module compatible with?
Works immediately with TP-Link switches T3700, T2700, T2600, T2500, T1700, T1600, T1500, 2/3/5 Series, and MC220L
What type of fiber is used?
Compatible only with Single-Mode fiber of size 9/125 μm
How far can the signal be transmitted?
Up to 10 kilometers per single fiber
Does it need to be used with another module?
Yes, it must be used with a matching TL-SM321B or CM112CM module to function properly
Is it in stock?
The TP-Link SM321A 1000Base-BX WDM Bi-Directional SFP Module 1.25Gbps 10KM is in stock and ready to ship. Orders placed before 12:00 on a business day are delivered within 1–3 business days (Bangkok and vicinity) or 2–5 business days (other provinces). Order online at store.gist.co.th or contact our sales team at 092-251-4017.
How much does it cost?
The price is ฿467 (including 7% VAT). It is in stock and ready to ship. Business customers can request a quotation at sales@gist.co.th.
How long is the warranty?
Warranty period: Warranty as per manufacturer's terms (manufacturer's terms). To make a warranty claim, call 092-251-4017 or 065-523-5262, or email sales@gist.co.th (Mon–Fri 9:00–18:00), then send the product with your order number to our head office, or bring it to the head office in person.
How long does delivery take?
Orders placed before 12:00 on a business day are delivered within 1–3 business days (Bangkok and vicinity) or 2–5 business days (other provinces). Free delivery on orders of ฿5,000 or more (a ฿150 delivery fee applies below this amount).
Is it genuine?
Genuine products sourced from distributors in Thailand, covered by the manufacturer's warranty. Full tax invoices are available.
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Genuine products
Sourced from distributors in Thailand and covered by the manufacturer's warranty
Warranty period
Warranty as per manufacturer's terms
Covered by the manufacturer's warranty; you can make claims through GIST
Claims through GIST
Ship the product to our head office or bring it in person
Warranty conditions
- A receipt or other proof of purchase is required
- The product must not have been modified or altered
- Damage caused by misuse is not covered by the warranty
- To make a warranty claim, call 092-251-4017 or 065-523-5262, or email sales@gist.co.th (Mon–Fri 9:00–18:00), then send the product with your order number to our head office, or bring it to the head office in person.Head office: 554 Sky Nine Center, Floor 12A, Room 554/62, Asok-Din Daeng Road, Din Daeng Subdistrict, Din Daeng District, Bangkok 10400
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Price
฿467