Microwave Link : XPIC + 4096QAM

[simog72]

Hi
I'm just try collecting experiences from people here.

A lot of MW vendors is declaring today a 4096QAM modulation modem support but it is not clear if this highest modulation schemes can be applied in real case scenario in 1+0 only or also in XPIC

according to my knowledge could be (on paper) possible on:
HUAWEI: XMC3+950 IDU or RTN320
NEC: IPasolink VR + IAG ODU or IX
INFRACOM: OMIBAS OSDR
SIAE Microelettronica: ALFOplus2
DRAGONWAVE: Harmony MC (exist?)

who has tested or who is using a MW link with 4096QAM modulation in XPIC configuration?

[omid373]

Salam Simog,
4096Q mostly is being used for marketing purposes.Because a 4096Q link is not reliable because of high sensitivity to noise or usual issues on MW links.We have RTN XMC3 + ISM6 if boards which support 4096Q , but it is not supported in all frequency bands , specially with XPIC.for example in 38G modulation higher than 1024Q is not supported.
Also with Intracom(Infracom?) 4096q is supported as I know. But again with Intra com , we don't use it even on non xpic links because of availability/quality issues on high QAM modulations.
Br.
omid

Sent from my HUAWEI G750-U10 using Tapatalk

[numas]

Hi Simog72

according to my knowledge and my "in-field" experience i can tell that i saw (and i see daily) some working link at 4096QAM and XPIC (and ACM)
It's an Italian Microwave product named ALFOPlus2 (Siae Microelettronica)
It's a compact single box dual carrier with 4xGbe ports (similar to IP20C but with XPIC canceller @ 4096QAM , little higher sysgain and upto 112MHz channels capability)
i saw working links in 18GHz, 23GHz and 11GHz freq ranges

i saw with my eyes throughput close to 1.2 Gbps in 56MHz channels (XPIC ) at 4096QAM (without any compression)
and close to 2.1Gbps with compression upto L3.

in my visibility , at the moment, there is not any point to point microwave supplier capable to XPIC 2channels @ 4096QAM


i m curious to know other forum users experiences

[hmursalin]

from field experience, 4096QAM doesn't work as it is supposed to with slightest signal fluctuation causing high BER

[simog72]

hi Hmursalin
thanks to bring your experience here

can u please share what was the model of the microwave u tried in field ?

and what was the geographical area?

[hmursalin]

We had a field trial with iPASO VR4, however it was over a water body which was one of the problems. The link worked fine with 1024QAM.

[megadragon25]

Tested with 2048 QAM with XPIC and 56 Mhz Channel, in AGS020 from SIAE works fine 1.8 Gbps

[simog72]

Megadragon25
thanks to you too for bringing your expertise here!

Can u explain better how was the set up to reach a 1.8Gbps in a 2x56MHz channel Xpic?

According to my knowledge :
SIAE Microelettronica AG20 (split) cannot operate @ 2048QAM/XPIC (only in Non XPIC)
only the ALFOplus2 (full outdoor) operates @ 4096QAM , 2x112MHz and XPIC at same time

in any case 2x56MHz XPIC@2048QAM brings more or less 2x500Mbps

so I suspect u implemented a 4+0 Split mount or you was on with the Header Compressor


can you better explain?

thanks

[megadragon25]

Hi,

sorry for my late reply i was working out of city... on field if you are keep looking for information I give a document with our solution (I am an engineer of SIAE).

https://www.dropbox.com/s/xali4nkn38...N%2B0.pdf?dl=0

[megadragon25]

It's possible to work with XPIC but you require licence for use the XPIC.