400 Gbps 이더넷 광모듈 Form Factors and Protocols
CFP8 400G Transceiver Form Factor
The C Form-Factor Pluggable 8 (CFP8)
(Figure 1) provides first-to-market advantages for telecommunications network
providers:
16x25G
electrical interface.
A strong addition to the existing CFP standard of transceivers.
Electrical and optical signalling available using 50Gb/s or
25Gb/s components.
Good thermal and cooling management due to a larger footprint.
Low port density due to the large size of the CFP8 form factor.
Requires a larger enclosure, around the size of a CFP2.
CFP8 form factors include:
400GBASE-SR16
400GBASE-FR8/LR8
400GBASE-DR4
QSFP-DD 400G Transceiver Form Factor
The Quad Small Form Factor Pluggable
Double Density (QSFP-DD) form factor is designed for good backwards
compatibility. QSFP-DD takes advantage of a similar design to 40G QSFP and 100G
QSFP28 but with a higher electrical contact density. It uses 8 lanes at 50-Gbps
per second each to provide a total of 400G.
A well-known
form factor familiar to engineers who work with 40 and 100GbE networks.
Uses an eight-lane electrical interface.
QSFP-DD can be plugged into the same racks and cages as standard
QSFP modules.
Consumes less power than comparable form factors, resulting in
lower operational costs.
A good form factor if you need strong backwards compatibility
with other network infrastructure.
Limited expansion for new 400G electrical and optical
components.
OSFP form factors include:
OSFP 400G Transceiver Form Factor
The Octal Small Form Factor Pluggable
(OSFP) (Figure 2) form factor is a smaller device designed for maximum
performance. It uses 8 lanes at 50-Gb/s each to provide a total of 400G.
Uses eight
electrical lanes to provide 400G.
A small form factor that’s easily pluggable.
Fits up to 36 ports in a standard rack unit.
14Tb/s from one rack unit fully-installed with OSFP 400G.
Designed to work exclusively with 50Gb/s signalling.
Does not provide legacy application support or backwards
compatibility.
Excellent electrical and signal integrity performance.
Thermal and cooling management heat sinks are built directly
into OSFP.
Requires an adapter for backwards compatibility.
OSFP form factors include:
