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RBK752 and compatible cable modems
I received an email from Comcast recently telling me that "latest device can't keep up with the latest speeds." I guess I got upgraded from 1 Gbps service to 1.2 Gbps at some point. I had pur...
mrosen wrote:
Oh, really? That extra .2 Gbps isn't worth the expense? That's good to know.
Sorry for the terse response earlier.
The existing CM1150V modem supports port aggregation to pass greater than 1GB to the customer router.
https://www.netgear.com/images/datasheet/networking/CableModems/CM1150V.pdf
Page 13 of the user manual explains port aggregation:
https://www.downloads.netgear.com/files/GDC/CM1150V/CM1150V_UM_EN.pdf
Port aggregation was a technique that was introduced when DOCSIS 3.1 modems became available, but consumer routers did not have Ethernet ports capable of greater than gigabit speed.
The RBR750 router also supports link aggregation:
https://www.netgear.com/images/datasheet/orbi/RBK752.pdf
Thus, without spending any money, that extra .2GB can be available to the router, provided that you can get port aggregation to work. (I have no experience with that feature.)
If you do choose to purchase the CM2000 modem, it does not support port aggregation because it comes with a single 2.5GB Ethernet port:
https://www.netgear.com/images//datasheet/networking/CableModems/CM2000.pdf
In this case, the RBR750 can connect only the single gigabit WAN port, and thus can achieve at most 1GB, and the additional .2GB is superfluous. To get the additional .2GB with the new modem means you also have to purchase a new router.
As to "worth it", it is hard to imagine a residential customer who needs greater than a constant 1GB internet connection.
Streaming 4K video requires 25MB. So, let's assume 10 TV's constantly streaming video. (250MB) Add in 10 people constantly hosting Zoom meetings (@ 4GB each = 40GB). Add in another 10 people playing video games (Call of Duty @ 4.0 = 40MB)
That amounts to 250+40+40 = 330MB, leaving only a puny 670MB for "other stuff".
Oh, really? That extra .2 Gbps isn't worth the expense? That's good to know.
Thanks.
mrosen wrote:
Oh, really? That extra .2 Gbps isn't worth the expense? That's good to know.
Sorry for the terse response earlier.
The existing CM1150V modem supports port aggregation to pass greater than 1GB to the customer router.
https://www.netgear.com/images/datasheet/networking/CableModems/CM1150V.pdf
Page 13 of the user manual explains port aggregation:
https://www.downloads.netgear.com/files/GDC/CM1150V/CM1150V_UM_EN.pdf
Port aggregation was a technique that was introduced when DOCSIS 3.1 modems became available, but consumer routers did not have Ethernet ports capable of greater than gigabit speed.
The RBR750 router also supports link aggregation:
https://www.netgear.com/images/datasheet/orbi/RBK752.pdf
Thus, without spending any money, that extra .2GB can be available to the router, provided that you can get port aggregation to work. (I have no experience with that feature.)
If you do choose to purchase the CM2000 modem, it does not support port aggregation because it comes with a single 2.5GB Ethernet port:
https://www.netgear.com/images//datasheet/networking/CableModems/CM2000.pdf
In this case, the RBR750 can connect only the single gigabit WAN port, and thus can achieve at most 1GB, and the additional .2GB is superfluous. To get the additional .2GB with the new modem means you also have to purchase a new router.
As to "worth it", it is hard to imagine a residential customer who needs greater than a constant 1GB internet connection.
Streaming 4K video requires 25MB. So, let's assume 10 TV's constantly streaming video. (250MB) Add in 10 people constantly hosting Zoom meetings (@ 4GB each = 40GB). Add in another 10 people playing video games (Call of Duty @ 4.0 = 40MB)
That amounts to 250+40+40 = 330MB, leaving only a puny 670MB for "other stuff".
Thanks!
I never really understood how to get the port aggregation to work. I'll have to look into that.
Just to chime in on port aggregation, I wouldn't use it. For business gear its been pretty stable but most of the consumer gear I've used, has had issues. Both in stability and speed. And I've tried several different modems from arris/netgear and routers from both. My best combination for stability was using a netgear cm1100 and an Arris AX11000 (w31).
Still wasn't that great and wasn't worth the headache for the extra .2 that I had so I disabled it.
