https://www.gbic-shop.de/de/produkte/transceiver/sfp/kompatibel-6/1000base-sx/linksys-mgbsx1-detail.html ..... Since the beginning, all transceiver specifications are defined under non-proprietary standards of the Multisource Agreement (MSA) of the SFF Committee.

1. DEVELOPMENT OF OPTICAL TRANSCEIVERS AND THEIR FUTURE

2. Since the beginning, all transceiver
specifications are defined under non-
proprietary standards of the
Multisource Agreement (MSA) of the
SFF Committee. This allows
intercomptability of products from
different manufacturers.

3. At the beginning of the development
of optical modules, only modules that
had to be soldered into the hardware
existed. These transceivers came in
the 1x9 SFF format and were first
used in 1999.

4. This technological development offered
many obvious advantages: In addition to
simplifying maintenance, a network for
the "pay as you grow" principle has now
been established. By pluggable modules
the user was easily able to subsequently
increase the bandwidth on a network. The
introduction of the GBIC modules by many
large network manufacturers started the
large spreading of this transceiver.

5. Today there are two variants of these modules. The QSFP-SR
, with a range of up to 150 meters on OM4 fibers, as well as
the QSFP-LR, with a range of up to 10KM over OS2 fibers.
The standards for QSFP-ER , with a range of 40KM, already
exist. The BlueOptics will launch this QSFP -ER transceiver in
the fourth quarter of 2014 as one of the first manufacturers
worldwide.

6. The port density and thus the overall
network performance declined
significantly. Furthermore, for operators
of large networks, such as
Telecommunications providers, it was
not necessary to upgrade the ports later
on. In 2001, the actual fixed optics have
appeared on the market: 2x5 SFF and
2x10 SFF.

7. These transceivers are substantially
smaller than the GBIC. This was now
possible by the newly introduced LC
duplex connectors and the resulting
smaller PCBs (Printed Circuit Boards ) are
possible and among other things. SFF
optics are currently also still widespread
very far.

8. Today they are used, besides the building wiring, in
most EPON ONU hardware and have been obtained
strongly in importance by the proliferation of EPON
networks again.
But in LAN and MAN networks only replaceable
modules are used since the introduction of GBICs.

9. This also accounted for the resulting
disadvantages of dwindling port
density and overall performance. All
network manufacturers use SFP
modules for entry-level devices or
floor distributors till now on.

10. This allowed a transmission of 40 Gigabit with a hot-pluggable module for
the first time. The speed is achieved by four internal 10 Gigabit CWDM
channels. The modules are slightly larger than a XFP transceiver and have a
tab in the length of the module to be able to remove it from the hardware.
QSFP transceivers also have a MPO/MTP connector.

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https://www.gbic-shop.de/de/produkte/transceiver/sfp/kompatibel-
6/1000base-sx/linksys-mgbsx1-detail.html