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1000BASE-BX SFP module provides stable fiber connectivity.
TL-SM321A-2
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1000BASE-BX WDM BI-DIRECTIONAL SFP MODULE
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Name:
TL-SM321A-2
- Description:
- 1000BASE-BX WDM BI-DIRECTIONAL SFP MODULE
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- Brand:
- Tp-Link
- Condition:
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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.
TL-SM321A-2 price is is available on request. Get immediate quote.
Request bulk order quote for TL-SM321A-2 for additional pricing. Browse the full Tp-Link Routers series or explore all 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 
| TL-SM321A-2 |  ARCHER AX53 |  ARCHER AX6000 |  ARCHER C7 |  TL-R605 | |
|---|---|---|---|---|---|
| 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 | Firewall / Intrusion Prevention |
| Compliance Standards | FCC / CE | FCC, CE, RoHS | FCC, CE, RoHS | FCC, CE | FCC / CE / RoHS |
| Connectivity Type | Wired | Wired / Wireless | Wired / Wireless / Ethernet | Wired / Wireless | Wired |
| 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 | Dual Band, Guest Network, QoS, WPS | VPN / Firewall / IPv6 Compatible |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 256 MB | 16 MB | 256 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 | Not Supported | 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 | 128 MB | 512 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 | IEEE 802.11a/b/g/n/ac | IPv4 / IPv6 |
| Power | 50W | 24 W | 65W | 12V/1A | 20 W |
| Power Source | AC Power Supply with Redundant Option | AC Power Supply | AC Power Supply | AC Power Supply | DC Power Supply |
| Product Name | TL-SM321A-2 | TP-Link Archer AX53 | TP-Link Archer AX6000 | TP-Link Archer C7 AC1750 Wireless Dual Band Gigabit Router | TP-Link TL-R605 Gigabit Multi-WAN VPN Router |
| Product Type | Enterprise Router | Wireless Router | Wireless Router | Wireless Router | Enterprise 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 | Web-based management | HTTP/HTTPS / SNMP |
| 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 | AC1750 | Gigabit |
| 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 | AC1750 | 3.5 Gbps |
| Use Case | Enterprise | Small Business | Small Business | Home / Small Business | Small Business |
| VPN Support | IPSec / SSL VPN | N/A | IPSec | N/A | IPSec / PPTP / L2TP |
| WAN Configuration | Dual WAN | WAN | WAN | WAN | Dual WAN |
| WAN Ports | 2 WAN Ports | 1 WAN | 1 WAN | 1 WAN | 2 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 | WiFi 5 | N/A |
| Width | 17.5 inches | 8.5 inches | 11.4 inches | N/A | N/A |
| Wireless Support | No | Yes | Yes | Yes | No |
Reviews & Ratings
F
Fatou Ndiaye
4
Reliable single-fiber transmission with consistent Gigabit speeds.
I
Ivan Petrovic
5
Easy installation and dependable optical performance.
L
Leah Morgan
4
Professional WDM SFP for enterprise networking.
S
Samuel Ortiz
5
Stable throughput for long-distance links.
Questions & Answers
What is the TL-SM321A-2 1000BASE-BX WDM Bi-Directional SFP Module?
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.
What is the maximum link distance supported by TL-SM321A-2?
The TL-SM321A-2 supports distances up to 20 km over single-mode fiber at standard attenuation.
Which fiber type is required for the TL-SM321A-2?
The TL-SM321A-2 requires single-mode (SMF) fiber to achieve its specified reach and performance.
What wavelengths does the TL-SM321A-2 operate on?
The module transmits at 1310 nm and receives at 1550 nm, enabling WDM bi-directional operation on one fiber.
What connector interface does the TL-SM321A-2 use?
It features a standard LC duplex connector for simple plug-and-play installation.
Can the TL-SM321A-2 be hot-swapped?
Yes, the TL-SM321A-2 is fully hot-swappable and can be inserted or removed without powering down the host device.
Which network devices are compatible with the TL-SM321A-2?
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.
Does the TL-SM321A-2 support digital diagnostics monitoring (DDM)?
Yes, it complies with SFF-8472 DDM standards for real-time monitoring of optical power, temperature, and supply voltage.
What is the data rate of the TL-SM321A-2?
The TL-SM321A-2 delivers a fixed 1 Gbps data rate for reliable Gigabit Ethernet and Fiber Channel applications.
What is the operating temperature range of the TL-SM321A-2?
The module operates reliably between 0 °C and 70 °C (32 °F to 158 °F) ambient temperature.
What is the typical power consumption of the TL-SM321A-2?
The TL-SM321A-2 consumes less than 1 W, ensuring low power usage and minimal heat generation.
Is the TL-SM321A-2 compliant with industry standards?
Yes, it meets IEEE 802.3z (1000BASE-BX) and SFF-8431/SFF-8472 specifications and is RoHS compliant.
How do I install the TL-SM321A-2 in my switch or router?
Simply align the LC connector, insert the module into an empty SFP slot until it clicks, then connect your SMF cable.
How can I troubleshoot a link failure with TL-SM321A-2?
Check fiber polarity, inspect connectors for damage, verify matching Bi-Di module wavelengths at each end, and review DDM readings.
What is the difference between a Bi-Directional SFP and a standard SFP?
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.
How many TL-SM321A-2 modules are required for a full link?
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.