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Name:
TL-SM321A-2
- Description:
- 1000BASE-BX WDM BI-DIRECTIONAL SFP MODULE
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Delivery Timelines
Under 100 KG? Ships Express.
Smaller shipments go via DHL or FedEx Express — delivered worldwide in approximately 3 business days.
Over 100 KG? Ships via Freight.
Larger orders are dispatched through freight forwarding partners. Delivery takes 7–10 business days, globally.
Always Delivered to Your Door
Every shipment is delivered directly to your address — regardless of country or carrier.
Our best-in-class warranties
3-Year Extended Warranty
Extended protection, enterprise-grade.
All enterprise hardware is backed by a 3-year warranty — triple the industry standard — covering defects under normal use.
Professional repairs & replacements.
If a hardware issue is confirmed, we’ll repair or replace the unit. Replacement parts carry either original or 3-month coverage.
RMA process, simplified.
Once an RMA is approved, return the defective unit within 10 days. We handle the rest — no service gaps.
Service Boundaries & Exclusions
What’s covered — and what’s best avoided.
Your warranty covers defects under normal use. For continued protection, avoid accidental damage, unauthorized repairs, third-party parts, or extreme environments.
Know your location’s service type.
In some regions, return-to-factory or remote service may apply. On-site service depends on infrastructure availability.
Minimal documentation required.
To initiate service, just submit the invoice and warranty card — no red tape, no waiting.
14-Day Money Back Guarantee
Free 14-Day Returns
Tested it, but it’s not a fit?
Return any product within 14 days of delivery if it doesn’t meet your technical or operational needs.
Initiate returns with ease.
Our RMA process is streamlined — just raise a request, follow the packaging guidelines, and we’ll handle the rest.
Refund or restock, your call.
Changed your mind? Get a refund (restocking fees may apply) or swap with another product.
30-Day Hardware Replacement
Covered for any early faults.
All equipment includes a 30-day replacement warranty. If something goes wrong, we’ll repair or swap it — fast.
Replacements shipped in 10 days or less.
Once your return is inspected and approved, we dispatch the replacement promptly to keep your operations moving.
RMA protocol keeps it smooth.
Just ensure all accessories and original packaging are intact — we’ll take care of the technical validation.
TRUSTED, TRIED, PROVEN
TL-SM321A-2 Overview
TL-SM321A-2 is built on a modular architecture designed for high-performance networking. It provides multiple power options with a redundant AC power supply, dual WAN and four LAN interfaces, and integrated voice and video services that ensure reliable connectivity across diverse network deployments.
TL-SM321A-2 delivers robust VPN features—including IPSec and SSL VPN—along with high throughput capacity and redundant performance to meet enterprise-level requirements. Its modular capabilities, stacking support, and enhanced firewall security make it ideal for critical business applications and advanced network environments.
What is the price of TL-SM321A-2?
Pricing for TL-SM321A-2 is available on request. Get immediate quote or for exclusive discounts, opt for bulk quotation for TL-SM321A-2.
Explore more options from Routers or explore other Tp-Link products.
TL-SM321A-2 Specifications
| Product Type | Enterprise Router |
| VPN Support | IPSec / SSL VPN |
| Power Source | AC Power Supply with Redundant Option |
| Routing Protocols | OSPF / BGP / Static Routing |
| Broadband | N/A |
| Architecture | Modular |
| WAN Configuration | Dual WAN |
| WAN Ports | 2 WAN Ports |
| LAN Ports | 4 LAN Ports |
| Ethernet Technology | 10/100/1000 |
| Wi-Fi Standard | N/A |
| Connectivity Type | Wired |
| Network Protocols | IPv4 / IPv6 / TCP / UDP |
| Remote Management | HTTP / HTTPS / SNMP / CLI |
| Compliance Standards | FCC / CE |
| Wireless Support | No |
| Speed/Capacity | Gigabit |
| Firewall Features | Yes |
| Features | VPN / Firewall / IPv6 Compatible |
| Use Case | Enterprise |
| Management | Managed |
| Form Factor | Rack-mount |
| Integrated Services | Voice / Video |
| High Availability Support | Supported |
| Safety | N/A |
| EMC | N/A |
| Telecom | N/A |
| Throughput Capacity | 1 Gbps |
| QoS Features | Supported |
| Built-in Security Features | Firewall / Intrusion Prevention |
| Expansion Slots | SFP+ |
| Modular Slots Available | 2 Slots |
| Stacking Capability | Yes |
| 5G Support | No |
| Memory | 1 GB |
| Flash Memory | 256 MB |
| Interface Ports | RJ-45 / SFP |
| Power | 50W |
| Device Type | Router |
| Product Name | TL-SM321A-2 |
| Height | 1.75 inches |
| Width | 17.5 inches |
| Depth | 15 inches |
| Weight | 8 lbs |
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
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| 5G Support | No | No | No | No | No |
| Architecture | Modular | Fixed | Fixed | Fixed | Fixed |
| Broadband | N/A | N/A | Fiber Optic | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall | Firewall | Firewall / Intrusion Prevention | Firewall |
| Compliance Standards | FCC / CE | FCC, CE, RoHS | FCC, CE, RoHS | FCC / CE / RoHS | FCC, CE |
| Connectivity Type | Wired | Wired / Wireless | Wired / Wireless / Ethernet | Wired | Wired / Wireless |
| Depth | 15 inches | 9.45 inches | 8.2 inches | N/A | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | N/A | N/A | N/A | N/A |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Expansion Slots | SFP+ | N/A | N/A | N/A | N/A |
| Features | VPN / Firewall / IPv6 Compatible | VPN / IPv6 Compatible / Firewall | VPN, IPv6 Compatible, Firewall | VPN / Firewall / IPv6 Compatible | Dual Band, Guest Network, QoS, WPS |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 256 MB | 256 MB | 16 MB |
| Form Factor | Rack-mount | Desktop | Desktop | Desktop | Desktop |
| Height | 1.75 inches | 2.2 inches | 2.3 inches | N/A | N/A |
| High Availability Support | Supported | Not Supported | Not Supported | Supported | Not Supported |
| Integrated Services | Voice / Video | N/A | N/A | N/A | N/A |
| Interface Ports | RJ-45 / SFP | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 8 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Unmanaged | Managed | Managed | Managed |
| Memory | 1 GB | 512 MB | 1 GB | 512 MB | 128 MB |
| Modular Slots Available | 2 Slots | N/A | N/A | N/A | N/A |
| Network Protocols | IPv4 / IPv6 / TCP / UDP | 802.11a/b/g/n/ac/ax | 802.11ax, 802.11ac, 802.11n | IPv4 / IPv6 | IEEE 802.11a/b/g/n/ac |
| Power | 50W | 24 W | 65W | 20 W | 12V/1A |
| Power Source | AC Power Supply with Redundant Option | AC Power Supply | AC Power Supply | DC Power Supply | AC Power Supply |
| Product Name | TL-SM321A-2 | TP-Link Archer AX53 | TP-Link Archer AX6000 | TP-Link TL-R605 Gigabit Multi-WAN VPN Router | TP-Link Archer C7 AC1750 Wireless Dual Band Gigabit Router |
| Product Type | Enterprise Router | Wireless Router | Wireless Router | Enterprise Router | Wireless Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | HTTP / HTTPS / SNMP / CLI | Web GUI, TP-Link Tether | Web Interface, TP-Link Tether App | HTTP/HTTPS / SNMP | Web-based Management |
| Routing Protocols | OSPF / BGP / Static Routing | Static Routing | Static Routing / N/A | Static Routing | Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | Gigabit | 2.5gb | Gigabit | AC1750 |
| Stacking Capability | Yes | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 1 Gbps | 3 Gbps | 6 Gbps | 3.5 Gbps | AC1750 |
| Use Case | Enterprise | Small Business | Small Business | Small Business | Home / Small Business |
| VPN Support | IPSec / SSL VPN | N/A | IPSec | IPSec / PPTP / L2TP | N/A |
| WAN Configuration | Dual WAN | WAN | WAN | Dual WAN | WAN |
| WAN Ports | 2 WAN Ports | 1 WAN | 1 WAN | 2 WAN | 1 WAN |
| Weight | 8 lbs | 1.3 lbs | 3.5 lbs | N/A | N/A |
| Wi-Fi Standard | N/A | WiFi 6 | WiFi 6 / Dual band | N/A | WiFi 5 |
| Width | 17.5 inches | 8.5 inches | 11.4 inches | N/A | N/A |
| Wireless Support | No | Yes | Yes | No | Yes |
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Questions & Answers
Q
What is the TL-SM321A-2 1000BASE-BX WDM Bi-Directional SFP Module?
A
The TL-SM321A-2 is a single-mode, bi-directional 1 Gbps SFP transceiver using WDM technology to transmit and receive data over one fiber strand.
Q
What is the maximum link distance supported by TL-SM321A-2?
A
The TL-SM321A-2 supports distances up to 20 km over single-mode fiber at standard attenuation.
Q
Which fiber type is required for the TL-SM321A-2?
A
The TL-SM321A-2 requires single-mode (SMF) fiber to achieve its specified reach and performance.
Q
What wavelengths does the TL-SM321A-2 operate on?
A
The module transmits at 1310 nm and receives at 1550 nm, enabling WDM bi-directional operation on one fiber.
Q
What connector interface does the TL-SM321A-2 use?
A
It features a standard LC duplex connector for simple plug-and-play installation.
Q
Can the TL-SM321A-2 be hot-swapped?
A
Yes, the TL-SM321A-2 is fully hot-swappable and can be inserted or removed without powering down the host device.
Q
Which network devices are compatible with the TL-SM321A-2?
A
The TL-SM321A-2 is compatible with all 1000BASE-SX/LX/BX-compliant SFP ports from major vendors, including TP-Link, Cisco, Juniper, HP, and more.
Q
Does the TL-SM321A-2 support digital diagnostics monitoring (DDM)?
A
Yes, it complies with SFF-8472 DDM standards for real-time monitoring of optical power, temperature, and supply voltage.
Q
What is the data rate of the TL-SM321A-2?
A
The TL-SM321A-2 delivers a fixed 1 Gbps data rate for reliable Gigabit Ethernet and Fiber Channel applications.
Q
What is the operating temperature range of the TL-SM321A-2?
A
The module operates reliably between 0 °C and 70 °C (32 °F to 158 °F) ambient temperature.
Q
What is the typical power consumption of the TL-SM321A-2?
A
The TL-SM321A-2 consumes less than 1 W, ensuring low power usage and minimal heat generation.
Q
Is the TL-SM321A-2 compliant with industry standards?
A
Yes, it meets IEEE 802.3z (1000BASE-BX) and SFF-8431/SFF-8472 specifications and is RoHS compliant.
Q
How do I install the TL-SM321A-2 in my switch or router?
A
Simply align the LC connector, insert the module into an empty SFP slot until it clicks, then connect your SMF cable.
Q
How can I troubleshoot a link failure with TL-SM321A-2?
A
Check fiber polarity, inspect connectors for damage, verify matching Bi-Di module wavelengths at each end, and review DDM readings.
Q
What is the difference between a Bi-Directional SFP and a standard SFP?
A
Bi-Directional SFPs like the TL-SM321A-2 transmit and receive on different wavelengths over a single fiber strand, while standard SFPs use two fibers.
Q
How many TL-SM321A-2 modules are required for a full link?
A
You need a matched pair of opposite-wavelength modules—one TL-SM321A-2 (1310 nm TX/1550 nm RX) and its complementary SFP—for each fiber link.
