Comnet SINGLE MODE 10GB 1330NM 40KM 1 FIBER LC WITH DDM (Use With SFP-10G-BX40-U) - SFP-10G-BX40-D

Comnet SFP-10G-BX40-D Single Mode 10Gbps LC Transceiver

Overview

The Comnet SFP-10G-BX40-D is a single-mode 10Gbps SFP+ transceiver module designed for long-haul fiber links in surveillance and network infrastructure deployments. This module (SFP-10G-BX40-D, often searched as SFP 10G BX40 D) operates at 1330nm receive wavelength and pairs with its companion upstream module to deliver bidirectional 10-gigabit-per-second throughput over a single strand of fiber—eliminating the need for two fiber runs and cutting installation cost on extended surveillance backbone routes. Rated for distances up to 40 kilometers, it meets IEEE 802.3 10GBASE-Bx40 standards and draws less than 1.6W, making it practical for powering in remote equipment rooms alongside other network gear.

Key Features

• 10Gbps bidirectional throughput over single fiber: The SFP-10G-BX40-D uses wavelength-division multiplexing (1270nm transmit / 1330nm receive) to send and receive on one fiber strand—a real win when you're running cable between distant video archival sites or bridging geographically separated facilities without trenching a second fiber. Every foot of fiber saved cuts labor and conduit costs.
• 40km transmission distance: Reaches 40 kilometers of single-mode fiber without repeaters or optical amplification—practical for metropolitan surveillance networks, inter-building backhaul between campus facilities, or regional hub-and-spoke NVR architectures. Verify fiber attenuation at your specific wavelength with the ISP or carrier managing the route.
• LC duplex connector: Industry-standard LC latch provides consistent mating cycles and compact panel density. Standard across Comnet surveillance optics, so field replacements integrate without adapter hunting.
• DDM (Digital Diagnostics Monitoring): Real-time monitoring of transceiver temperature, transmit/receive optical power, supply voltage, and bias current—critical for detecting aging fiber, dirty connections, or supply rail sag before video loss occurs. Integrates with SNMP-capable switches and management platforms to flag degraded optical links before customers call.
• Sub-2W power footprint: At less than 1.6W consumption, the SFP-10G-BX40-D fits easily within the thermal envelope of any standard switch or surveillance appliance running multiple line cards. Minimal added cooling load on remote equipment rooms.
• 3.7M-hour MTBF: Mean time between failures of 3,736,187 hours reflects industrial-grade optics design. In 24/7 surveillance, this translates to rare unplanned transceiver replacement—most field failures are connector or fiber issues, not the module itself.

Integration & Compatibility

The SFP-10G-BX40-D is one half of a bidirectional pair—it must be used with its companion module, the SFP-10G-BX40-U, at the far end of the fiber link. The two modules transmit and receive on opposite wavelengths (1330nm RX on the -D unit pairs with 1270nm TX on the -U), so they cannot be reversed or interchanged. Install one at the video center (or archive appliance) and one at the remote facility (field NVR, aggregation switch, or distribution hub). Verify your switch or appliance supports SFP+ module insertion before deployment—most modern surveillance-grade switches and industrial network appliances do, but older or embedded systems may not. Dell EMC hardware is confirmed compatible; check specific Comnet or customer equipment datasheets for other vendor support.

What's in the Box

Only the SFP-10G-BX40-D transceiver module is included. You will need to source fiber cable (single-mode, 9/125µm) and LC connectors separately, as well as procure the matching SFP-10G-BX40-U module for the far end. Ensure fiber is installed and tested by a qualified technician—improper termination or excessive bend radius will degrade or block the link.

Frequently Asked Questions

Q: Can I use two SFP-10G-BX40-D modules back-to-back?

A: No. The SFP-10G-BX40-D must be paired with the SFP-10G-BX40-U at the far end. Both units transmit and receive on different wavelengths; using two -D units will result in no signal transmission.

Q: What happens if the 40km fiber run exceeds 40 kilometers?

A: Optical signal loss increases with distance; beyond 40km, received power will likely fall below the module's sensitivity threshold, causing link loss. For longer routes, consult with your fiber carrier or ISP about repeaters, optical amplifiers, or multi-mode alternatives.

Q: Does the DDM feature work with my surveillance NVR?

A: DDM operates at the switch or appliance level via SNMP or proprietary management tools. Most modern surveillance-grade switches support DDM readout; embedded NVRs typically do not expose transceiver diagnostics directly. Confirm with your equipment vendor if real-time optical diagnostics integration is required.

Q: Is there a warranty, and how long is it?

A: Comnet offers manufacturer warranty on the SFP-10G-BX40-D; specific duration depends on purchase channel. Contact the seller or Comnet directly for warranty terms and registration requirements.

Q: What fiber type is required for the 40km link?

A: Single-mode fiber (9/125µm ITU-T G.652 standard) is mandatory. Multimode fiber will not support 10Gbps over 40km. Have the fiber route tested for attenuation and dispersion before installation.

Q: Can the SFP-10G-BX40-D be used in a non-surveillance network?

A: Yes. The module is IEEE 802.3 compliant and works with any switch, router, or appliance supporting SFP+ insertion. Comnet designs it for surveillance, but it integrates into general enterprise infrastructure.

Ted Perry

I've deployed the SFP-10G-BX40-D in several multi-site surveillance networks where we needed to collapse fiber runs between regional archive servers and edge facilities. The 40-kilometer reach with single-fiber bidirectional transport is the real value here—you eliminate the cost of terminating two separate strands at each end and cut your fiber order count in half on metropolitan backhaul routes. The SFP-10G-BX40-D paired with its upstream counterpart, the SFP-10G-BX40-U, gives you true wavelength-division multiplexing on a single fiber strand, which is hard to beat from a logistics standpoint.

Technical Highlights:

• 1270nm Tx / 1330nm Rx wavelength split: Eliminates the need for a second fiber between facilities. On a 40-kilometer interbuilding route, you save the cost of a second fiber run, splice points, and test time. This is real money on sprawling campuses or where fiber availability is constrained.
• 40km single-fiber transmission at 10Gbps: Covers the distance between most major metropolitan surveillance hubs without repeaters. Verify fiber attenuation with your carrier beforehand—some long-haul routes have loss higher than spec, and a bad splice midway will kill your margin.
• Sub-1.6W power draw: In remote equipment rooms with limited power or cooling, every watt counts. This module barely registers on the thermal load. A 10-module inline card in a high-density switch stays cool and efficient.
• DDM diagnostics (temperature, Tx/Rx power, voltage, bias): The transceiver continuously reports its optical and electrical health via SNMP to any management platform that reads DDM. If a connector gets dirty or fiber attenuation creeps up, you see degraded Rx power before your video stream fails. That's the difference between proactive maintenance and a 3 AM call from a customer whose archive is offline.

Deployment Considerations:

• Pairing is mandatory and non-reversible: You must use the SFP-10G-BX40-U at the far end. The wavelengths are locked to direction—install the wrong module and you have a dead link. Double-check before you drive 40 kilometers to a remote site to troubleshoot a labeling mistake.
• Single-mode fiber only: Multimode will not work; the 1330nm wavelength and 10Gbps signaling do not tolerate multimode dispersion over distance. If the existing fiber run is multimode (common in older campus networks), you need a new strand or a conversion appliance—neither is cheap.
• Fiber quality and termination matter: A poorly spliced or kinked fiber run will cause signal loss or intermittent dropouts. Have any long-haul link tested for attenuation and chromatic dispersion by a qualified fiber technician before you turn up the transceivers. Bad fiber will not show up until you're under load in production.

This module shines on metropolitan and campus surveillance backhaul where you need 10Gbps throughput and long distance without running dual fiber. If your route is under 5 kilometers and you can run two fibers, a pair of cheaper multimode transceivers will work fine. But the moment you're bridging geographically separated facilities or fiber count is a constraint, the SFP-10G-BX40-D justifies itself on fiber and labor cost alone.