100g qsfp+ optics question (CWDM) - low prices

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james23

james23

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Nov 18, 2014
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I've worked with a good bit of fiber, but never CWDM nor 100g stuff yet (until now)-

Assuming that the QSFP28 modules ARE compatible with both of my switches (i know thats not always the case, but lets just assume yes here).

should connecting 2x of these optics together with a patch cable be a problem? (using a 150ft LC to LC SMF patch cable, connected directly):

QSFP28 100Gb QSFP+ 1310nm 2km SMF Transceiver Module KAIAM XQX5100 100G-CWDM4-RT

(ie is there a specific TX model number and a specific RX model number - or anything thing like that maybe?)

(im seeing these on ebay for ~ $30 or less!)

the only thing throwing me off is the CWDM part, as i will not be making use of cwdm here in the traditional sense. (ie will just be a patch cable between the 2x qsfp modules, no mux / demux boxes ect.)

thanks

nb; Perhaps the reason these are selling for so cheap on ebay is there is a thread where some have pointed out there are thermal issues (Or at least they run hotter than other 100g optics);

 
T

TRACKER

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Jan 14, 2019
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As far as i understand, mux/demux is done internally in the QSFP28 modules.
I run KAIAM XQX4302 in my mikrotik CRS504 switch and in my esxi hosts via Mellanox CX455A nics and OS2 LC fiber patch cables (5m each) and the modules keep temps around 50-55°C (i think their max limit is around 70°C).
I have this setup running for more than a year and it is rock stable :)
 
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james23

james23

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> As far as i understand, mux/demux is done internally in the QSFP28 modules.

Great thanks, This was my assumption also.

will update w full equpiment specs / Compatibility when done in next few weeks
 
james23

james23

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not sure if its A compatibility issue (switch is a netgear m4500-48XF8C on the latest FW v7.0.3.12 ) or if the qsfp modules are faulty, but im not getting a link between 2x KAIAM XQX5100 100GBase-CWDM4. More importantly the switch is showing local fault on one and local / remote fault on the other.

(ebay listing i bought from - Note the seller does have 5X users who left feedback saying Transceiver worked / all went well - That's not to say I didn't receive a bad pair):
www.ebay.com

QSFP28 100Gb QSFP+ 1310nm 2km SMF Transceiver Module KAIAM XQX5100 100G-CWDM4-RT | eBay

Find many great new & used options and get the best deals for QSFP28 100Gb QSFP+ 1310nm 2km SMF Transceiver Module KAIAM XQX5100 100G-CWDM4-RT at the best online prices at eBay! Free shipping for many products!
www.ebay.com

It should be noted currently I'm plugging these both into the same switch (works fine for a 100g DAC in the same switch / setup, stp just marks one port as blocking once a link is successfully established).

Later today I have some 100G PCIE cards coming in as well as a pair of Intel QSFP28 transceivers so we'll test between that also. if anyone has an input please reply.

a 4ft SMF OS2 LC duplex patch cable is linking the 2x Transceivers (within the same switch).

I have tried:
- turning off auto negotiation, locking both to 100G or 40G, as well as turning on FEC CL91 (Forward error correction for 100g)
- tried a different patch cables between the two (they are duplex LC).
- tried a multi mode OM4 patch cable (instead of the SMF patch) just in case I needed to attenuate the signal since its such a short run for optics rated for max of 2KM (this did bring the signal down by about 2db as I wanted- however all result in the same issue).


Code: 
(M4500-48XF8C) #show fiber-ports optics all

                                                 Output   Input
Port    Physical Port/  Temp  Voltage  Current   Power    Power     TX     LOS  Fault
        Lane Number     [C]   [Volt]     [mA]    [dBm]    [dBm]     Fault       Status
------  --------------  ----  -------  -------   -------  -------   -----  ---  -------------
0/49    0/49-Lane1      40.7    3.285     42.4     0.477    2.401   No     No   Local Fault
        0/49-Lane2      40.7    3.285     60.5    -1.053    1.081   No     No   Local Fault
        0/49-Lane3      40.7    3.285     41.9     1.010    2.330   No     No   Local Fault
        0/49-Lane4      40.7    3.285     36.3     1.419    1.968   No     No   Local Fault

0/56    0/56-Lane1      42.1    3.310     36.3     1.416   -0.332   No     No   Local & Remote Faults
        0/56-Lane2      42.1    3.310     60.5     0.216   -1.554   No     No   Local & Remote Faults
        0/56-Lane3      42.1    3.310     37.6     1.500    0.190   No     No   Local & Remote Faults
        0/56-Lane4      42.1    3.310     37.3     1.374    1.072   No     No   Local & Remote Faults
       


(M4500-48XF8C) #show transceiver device
0/49       100GBase-CWDM4    KAIAM CORP        XQX5100           OPERATIONAL
0/52       100GBase-CR4      Molex             CAB-Q-Q-100G-2M   OPERATIONAL
0/55       100GBase-CR4      Molex             CAB-Q-Q-100G-2M   OPERATIONAL
0/56       100GBase-CWDM4    KAIAM CORP        XQX5100           OPERATIONAL


(++) : high alarm, (+) : high warning, (-) : low warning, (--) : low alarm.
mA: milliamperes, dBm: decibels (milliwatts), NA: not available, -: null/unknown.

             Temperature    Voltage      Tx bias current    Tx Power       Rx Power
Interface     (Celsius)     (Volts)           (mA)            (dBm)          (dBm)
------------ -------------- ------------ ------------------ -------------- ------------
0/49         40.73          3.29         45.16              0.54           1.97
0/56         41.79          3.31         42.77              1.16           -0.07


(M4500-48XF8C) #show transceiver interface detail

(++) : high alarm, (+) : high warning, (-) : low warning, (--) : low alarm.
mA: milliamperes, dBm: decibels (milliwatts), NA: not available, -: null/unknown.

Interface...................................... 0/49
Gigabit Ethernet Compliance Codes.............. 100GBase-CWDM4
Vendor Name.................................... KAIAM CORP
Vendor Part Number............................. XQX5100
Vendor Serial Number........................... BL1807000EK
Vendor Revision Number......................... 1A
Vendor Manufacturing Date...................... 2018/02/21
Wavelength..................................... 1310 nm
Link length supported for 9um fiber............ 2 km
Temperature.................................... 40.90 Celsius
Voltage........................................ 3.29 Volts
Tx bias current:
Ch1 Tx Current................................. 42.17 mA
Ch2 Tx Current................................. 60.54 mA
Ch3 Tx Current................................. 41.63 mA
Ch4 Tx Current................................. 36.32 mA
Tx Power:
Ch1 Tx Power................................... 0.44 dBm
Ch2 Tx Power................................... -1.07 dBm
Ch3 Tx Power................................... 0.97 dBm
Ch4 Tx Power................................... 1.41 dBm
Rx Power:
Ch1 Rx Power................................... 2.35 dBm
Ch2 Rx Power................................... 1.10 dBm
Ch3 Rx Power................................... 2.29 dBm
Ch4 Rx Power................................... 1.99 dBm
Temperature high alarm threshold............... 63.00 Celsius
Temperature high warning threshold............. 58.00 Celsius
Temperature low warning threshold.............. 5.00 Celsius
Temperature low alarm threshold................ 0.00 Celsius
Voltage high alarm threshold................... 3.46 Volts
Voltage high warning threshold................. 3.41 Volts
Voltage low warning threshold.................. 3.18 Volts
Voltage low alarm threshold.................... 3.13 Volts
Tx bias current high alarm threshold........... 100.00 mA
Tx bias current high warning threshold......... 90.00 mA
Tx bias current low warning threshold.......... 10.00 mA
Tx bias current low alarm threshold............ 5.00 mA
Tx power high alarm threshold.................. 5.00 dBm
Tx power high warning threshold................ 2.50 dBm
Tx power low warning threshold................. -5.50 dBm
Tx power low alarm threshold................... -6.50 dBm
Rx power high alarm threshold.................. 5.00 dBm
Rx power high warning threshold................ 2.50 dBm
Rx power low warning threshold................. -10.50 dBm
Rx power low alarm threshold................... -11.50 dBm

(++) : high alarm, (+) : high warning, (-) : low warning, (--) : low alarm.
mA: milliamperes, dBm: decibels (milliwatts), NA: not available, -: null/unknown.

Interface...................................... 0/56
Gigabit Ethernet Compliance Codes.............. 100GBase-CWDM4
Vendor Name.................................... KAIAM CORP
Vendor Part Number............................. XQX5100
Vendor Serial Number........................... BL1814000EC
Vendor Revision Number......................... 1A
Vendor Manufacturing Date...................... 2018/04/20
Wavelength..................................... 1310 nm
Link length supported for 9um fiber............ 2 km
Temperature.................................... 42.05 Celsius
Voltage........................................ 3.31 Volts
Tx bias current:
Ch1 Tx Current................................. 35.78 mA
Ch2 Tx Current................................. 60.54 mA
Ch3 Tx Current................................. 37.37 mA
Ch4 Tx Current................................. 37.38 mA
Tx Power:
Ch1 Tx Power................................... 1.35 dBm
Ch2 Tx Power................................... 0.23 dBm
Ch3 Tx Power................................... 1.47 dBm
Ch4 Tx Power................................... 1.39 dBm
Rx Power:
Ch1 Rx Power................................... -0.36 dBm
Ch2 Rx Power................................... -1.57 dBm
Ch3 Rx Power................................... 0.15 dBm
Ch4 Rx Power................................... 1.07 dBm
Temperature high alarm threshold............... 63.00 Celsius
Temperature high warning threshold............. 58.00 Celsius
Temperature low warning threshold.............. 5.00 Celsius
Temperature low alarm threshold................ 0.00 Celsius
Voltage high alarm threshold................... 3.46 Volts
Voltage high warning threshold................. 3.41 Volts
Voltage low warning threshold.................. 3.18 Volts
Voltage low alarm threshold.................... 3.13 Volts
Tx bias current high alarm threshold........... 100.00 mA
Tx bias current high warning threshold......... 90.00 mA
Tx bias current low warning threshold.......... 10.00 mA
Tx bias current low alarm threshold............ 5.00 mA
Tx power high alarm threshold.................. 5.00 dBm
Tx power high warning threshold................ 2.50 dBm
Tx power low warning threshold................. -5.50 dBm
Tx power low alarm threshold................... -6.50 dBm
Rx power high alarm threshold.................. 5.00 dBm
Rx power high warning threshold................ 2.50 dBm
Rx power low warning threshold................. -10.50 dBm
Rx power low alarm threshold................... -11.50 dBm
 
Last edited:
james23

james23

Active Member
Nov 18, 2014
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> multi mode OM4 patch cable ??? CWDM4 is single mode (SMF), OS2 cable...

i know that- You may have misread I used SMF patch cables (the MM patch was just a 2nd test incase signal needed to be attenuated ie lowered power, which it did bring the signal down about 3db as i wanted, but still same issue.) since this is all on the same switch the link length is about 4 feet total (for now).
I probably shouldn't have even mentioned the multi-mode patch cable test as it may have confused the issue (so disrguard it please). thanks

(i edited my original post to make this more clear)
 
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