The QSFP+ transceiver comparison

Comparison of different variants of optical QSFP+ formfactor

QSFP+ WITH LC QSFP+ WITH MTP/MPO
QSFP-Plus-CWDM-40-Gigabit-SM-1310nm-10km-DDM-DOM-300x212.jpg.pagespeed.ce.L4U5ekCoe1 QSFP-Plus-LR4-40-Gigabit-SM-1310nm-10km-DDM-DOM-300x212.jpg.pagespeed.ce.JVnMh4Q3N2

The main difference between Q.1640G.x and Q.85/1340G.x is the connector type. QSFP+ like Q.1640G.x do have an integrated CWDM Mux/Demux which multiplexes all 4 lanes to only one fiber. This gives the ability to use a LC-Duplex connector with a standard Multimode- or Singlemode-Fiber.

Some nomenclatures like LM4, LX4, IR4 are really confusing. Let me explain in short:

  • LM4: Is long-range Multimode (100-140m OM3 / up to 160m on OM4)
  • IR4: Is 2km on Singlemode
  • LX4: Combines both - 2km Singlemode and 100-160m Multimode

QSFP+ with MTP/MPO connector are more price sensitive. There is just a cabling with MTP/MPO cables needed.

Description/
Connector
Distance Wavelength Connector Details Interoperability Provider
QSFP+
SR4
100m (OM3)
150m (OM4)
4 x 850nm MTP/MPO IEEE 802.3ba
(40GBASE-SR4)
QSFP+ extended SR4

SFP+ SR

Flexoptix
Q.8540G.02Cisco
QSFP-40G-SR4Juniper
QFX-QSFP-40GE-SR4Arista
40GBASE-SR4Brocade
40G-QSFP-SR4*
QSFP+
eSR4
300m (OM3)

400m (OM4)

4 x 850nm MTP/MPO optimized VCSEL with better performance of RMS spectral width compared with QSFP+ SR4 QSFP+ SR4

SFP+ SR

Flexoptix
Q.8540G.03Juniper
QFX-QSFP-40GE-ESR4*Arista
40GBASE-XSR4
QSFP+ LX4 150m (OM3)

160m (OM4)

1270nm,
1290nm,
1310nm,
1330nm
LC Multimode optimized

4-Kanal CWDM Mux/Demux inside

Flexoptix
Q.1640G.03Juniper
JNP-QSFP-40G-LX4
QSFP+ BIDI SR 100m (OM3)

120m (OM4)

1 x 850nm

1 x 900nm

LC BIDI for Multimode is hot!

20G per lambda!

only available from Cisco at the moment Cisco
QSFP-40G-SR-BD
QSFP+ IR4 1km (G.652) 1270nm,
1290nm,
1310nm,
1330nm
LC 4-Channel CWDM Mux/Demux inside SFP+ CWDM Flexoptix
Q.1640G.2Arista
40GBASE-LRL4Juniper
JNP-QSFP-40GE-IR4
QSFP+ LR4 10km (G.652) 1270nm,
1290nm,
1310nm,
1330nm
LC IEEE 802.3ba (40GBASE-LR4)

4-Channel CWDM Mux/Demux inside

SFP+ CWDM Flexoptix
Q.1640G.10Juniper
JNP-QSFP-40G-LR4Cisco
QSFP-40G-LRArista
40GBASE-LR4Brocade
40G-QSFP-LR4
QSFP+ LR4 10km (G.652) 1270nm,
1290nm,
1310nm,
1330nm
LC IEEE 802.3ba (40GBASE-LR4)

4-Channel CWDM Mux/Demux inside

SFP+ CWDM Flexoptix
Q.1640G.20
QSFP+ ER4 30km (G.652) 1270nm,
1290nm,
1310nm,
1330nm
LC IEEE 802.3ba (40GBASE-ER4) SFP+ CWDM Flexoptix
Q.1640G.40
QSFP+
PIR4
1km (G.652) 4 x 1310nm MTP/MPO
APC
4 x 10G operations on SMF QSFP+ parallel LR4
SFP+ LR
Flexoptix
Q.1340G.2Arista
40GBASE-PLRL4Juniper
JNP-QSFP-4x10GE-IR
QSFP+
PLR4
10km (G.652) 4 x 1310nm MTP/MPO
APC
4 x 10G operations on SMF QSFP+ short parallel LR4

SFP+ LR

Flexoptix
Q.1340G.10Arista
40G-PLR4

Note: a QSFP+ LR4 is interoperable with a QSFP+ LR4. I didn't mention this in the columen "interoperability" for a better overview. This applies to all other types as well.

* Juniper enables for their QFX-QSFP-40GE-ESR4 also 4 x 10G operations - to split up one QSFP+ port in 4 dedicated 10G ports (credits go to Tom Eichhorn for working tirelessly on the QFX tests). The same applies for Brocade. For this kind of operation they defined a special article/partnumber 40G-QSFP-SR4-INT. From a technical point of view this "split operation" is possible with all QSFP+ mentioned above. QSFP+ get always 4 x 10G from the host on the electrical side. Only the programming of the transceiver needs to be adapted for the host. On the optical path you have to check how to split up the signal in 4 dedicated 10G lines. For the ones with MTP/MPO receptacle this is not a problem with  Breakout-cables.

 

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