DDM (Digital Diagnostics Monitoring) 이란?
is a technology used in SFP transceivers in
order to give the end user the ability
to
monitor real-time parameters of the SFPs. Such
parameters include
optical output/input power,
temperature,
laser bias current,
transceiver supply voltage etc.
DOM (Digital optical monitoring) 이란?
DOM,
is familiar with the DDM function.
It is also a feature which allows you to
monitor many parameters of the transceiver module in real-time.
DOM allows you to monitor
TX (transmit) and RX (receive) of
the module,
그리고 input/output power, temperature, and voltage.
Network administrators can then check and
ensure that the module is functioning correctly.
Obviously a SFP with DDM/DOM funstion is
high-ender than one which without it.
This is why most of modern optical SFP
transceivers support DDM/DOM functions according to the industry-standard
SFF-8472.
RGD (rugged) SFP 란?
You
may be confused with the difference with the SFPs with “RGD” and the one
without it,
or you may be interested in the “-RGD” in
the product number of some SFP transceiver modules.
So, what does RGD stand for? RGD means
rugged transceivers.
In fact, these are enhanced transceiver
modules which have been designed for greater durability,
and can operate under more extreme
conditions. Rugged transceivers may
feature
enhanced ESD protection,
extended operating temperature range so that it can
help eliminate field failures
without the need of costly external
protection devices.
Author Note: In general, a rugged SFP can
be identified by its product model, ie. -RGD.
Specific situations depend on the specific
vendors.
“=” in CISCO SFP transceivers
If
you have an experience of buying Cisco SFPs, you may be confused with
the part number with “=”,
because you can not find out the difference
with the one without “=” according to the specification.
In fact, “=” is also called a “FRU” part where FRU stands for “Field Replaceable
Units”.
Those are the parts that can be used as “spare”
or be shipped individually to replace damaged units. But the new parts that are
ordered directly from a reseller or from Cisco usually don’t come with the =
sign.
Thus, if you want to buy an SFP transceiver
with the “FRU” part, you should ask your vendor to ensure this function.
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