Tag Archives: SFP transceiver

SFP DOM — A Fiber Tester Inside Your SFP Transceiver

When reading parameters of an SFP transceiver, you may see words like “DOM”. Do you know what’s the meaning of “DOM”? And why should an SFP transceiver be with DOM? In this post, some detailed information about SFP DOM will be given.

What Is SFP DOM?

DOM, short for digital optical monitoring, is used to monitor some parameters of the transceiver in real-time, helping to identify the location of the fiber link failure, simplify maintenance, and improve system reliability. DOM allows you to monitor the TX (transmit) and RX (receive) power of the module, temperature, and transceiver supply voltage. You can configure your device to monitor optical transceivers in the system, either globally or by specified port. When this feature is enabled, the system monitors the temperature and signal power levels for the optical transceivers in the specified ports. Console messages and syslog messages are sent when optical operating conditions fall below or rise above the SFP manufacturer’s recommended thresholds. With DOM, network administrators can check and ensure that the module is functioning correctly in an easy and convenient way. This is why most of modern optical SFP transceivers support DOM functions. The following image shows a Brocade E1MG-SX-OM compatible 1000BASE-SX SFP DOM transceiver. With DOM function, it is able to assist network designers in detecting and digitizing parameter signals on circuit board inside the SFP module.

1000BASE-SX SFP DOM Transceiver

How to Use SFP DOM?

To ensure the DOM capability function well, both the device and the platform must support the feature. When the transceiver module is DOM-enabled, a minimum software version may be required to support the feature in each platform. There are some restrictions of using DOM. Ensure that your optical transceiver supports DOM; specifies the time interval for monitoring optical transceivers; in case of combo ports with SFP and RJ45 provision, when SFP is inserted in slot or port and media type is not configured to SFP, DOM is functional only if global transceiver monitoring is enabled.

SFP DOM Transceivers

With the popularity of DOM function, there are many SFP transceivers are with DOM, like 1000BASE-LX SFP DOM transceiver, 1000BASE-SX SFP DOM transceiver, 1000BASE-LX SFP DOM transceiver, 1000BASE-EX SFP DOM transceiver, and 1000BASE-ZX SFP DOM transceiver. And there are many third-party optical transceiver include the DOM functionality. What should be mentioned here is that although optical transceivers with DOM are much popular than those without DOM, some user still use the older optical transceivers in consideration of the upgrading costs.


SFP transceivers with DOM help to ensure that the business can be proactive in preventative maintenance of the network and ensure business continuity. And it would easy to explain why modern transceivers are with DOM. It is an irresistible development trend of industry and technology. Fiberstore is a professional optical transceiver manufacturer and supplier, which offers a with varity of compatible SFP transceivers with DOM functionality with a low cost. For example, Allied Telesis AT-SPSX compatible 1000BASE-SX SFP DOM transceiver costs only $6.00, and NETGEAR AGM732F compatible 1000BASE-LX SFP DOM transceiver costs only $7.00.

More details on transceiver DOM function, read:

DDM, DOM and RGD in SFP Transceiver Models

What Is 10G DWDM C-band Tunable XFP Module?

WDM (wavelength division multiplexing) technology, based on the concept of using multiple wavelengths of light on a single fiber, has been very popular in today’s data transmission. Dense WDM (DWDM) is one type of WDM which uses the C-Band transmission window with denser channel spacing. In a 10G DWDM network application, there are multiple transceiver choices for you. Among them, this article will introduce one option for you, DWDM C-band tunable XFP module.


The tunable DWDM transceiver is a unique product which enables you to set the channel or “color” that the laser emits. This type of transceiver has been around for a number of years but it was not until 2008 that the first tunable optics were available in the pluggable XFP form factor. Tunable transceivers are only available in DWDM form because the CWDM grid is too wide. Typically these tunable optics are for the C-Band 50GHz. Around 88 different channels can be set with intervals of 0.4nm, which is the 50GHz band. Tunable transceivers are typically used as “spare-optics”, in case of emergency, because you can tune them to the right channel and reduce the amount of spare optics you need to hold in stock.

DWDM tunable XFP 10 Gbps multiprotocol optical transceiver is an integrated fiber optic transceiver that provides a high-speed serial link of signaling rates. The module complies with the 10 Gigabit small form factor pluggable (XFP) multi-source agreement (MSA), and the ITU-T G.698.1 S-D100S1-2D standard. It features a hot-pluggable XFI-compliant electrical interface. DWDM tunable XFP transceiver integrates the receive and transmit path on one module. On the transmit side, the 10 Gbps serial data stream is recovered, retimed, and passed to a modulator driver. The modulator driver biases and modulates a C-band-tunable integrated laser, enabling data transmission over single-mode fiber through an industry-standard LC connector. On the receive side, the 10 Gbps optical data stream is recovered from an APD/transimpedance amplifier, retimed, and passed to an output driver. DWDM tunable XFP transceiver is designed to support full range of C-band ITU-T wavelength data rates from 9.95Gbps to 11.3Gbps and distances up to 80km. The image below shows a Cisco ONS-XC-10G-C compatible 10G DWDM tunable XFP transceiver.

Cisco ONS-XC-10G-C Compatible 10G DWDM C-band Tunable XFP 50GHz 80km DOM Transceiver

Features of DWDM C-band Tunable XFP
  • XFI electrical interface compliant
  • Hot-pluggable XFP footprint
  • 80km MZM tunable TOSA
  • RoHS6 compliant
  • Client side and line side loopback functions
  • XFP MSA compliant form factor connector
  • Supports 50GHz ITU-based channel spacing (C-Band)
  • With wavelength locker function, wavelength precision about 0.02nm
Applications of DWDM C-band Tunable XFP

DWDM tunable XFP pluggable module allows enterprise companies and service providers to provide scalable and easy-to-deploy 10 Gigabit LAN, WAN, and Optical Transport Network (OTN) services in their networks. This module is a high performance and cost effective XFP transceiver module designed for 10G SDH/SONET, IEEE DWDM 10GBASE-ZR for 40 or 80 km reach (Ethernet), and DWDM 10G FC (Fibre Channel) for 40 or 80 km reach applications. It’s also good for switching wavelength and details can be found in this article Wavelength Switching Solution: Tunable XFP Transceiver.


Fiberstore offers a variety of optical modules for extensive applications like telecommunication, datacommunication, and CWDM/DWDM network. Fiberstore’s DWDM C-band tunable XFP transceivers can be designed to be compatible with many major brands while delivering the deployment flexibility and inventory control. And Fiberstore provides a variety of industry standard from factors including SFP+, X2, XFP, SFP, like Avago AFBR-709SMZ compatible 10GBASE-SR/SW SFP+ and Allied Telesis AT-SPSX compatible 1000BASE-SX SFP transceivers, which can make the customers satisfied with the broad choices and high performance.