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Unboxing the RLT-1600X OLT from Radisys

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Written by: Barry McGinley 9/8/2022

Welcome to another unboxing, today we have an OLT from Radisys, that's an optical line terminal. This is the RLT-1600X from Radisys and it's an OLT (Optical Line Terminal). OLT provides residential broadband or it's part of a solution that provides residential broadband, and we're actually going to show you the solution. This box is the fruits of about 6 years of work.


In about 2016 the ONF (Open Networking Foundation), started a project called CORD, which is Central Office Re-architected as a Data center, and within that there's a project called SEBA, which is Software-Enabled Broadband Access, and Radisys we're heavily involved in this, and it's to look for an open solution for residential broadband for fiber to the home.

As we know within Europe and the US, fiber to the home is a massive market at the minute. We have our OLT and it's part of our PON (Passive Optical Network). We can also do this as active optical networking, active is when we have switches all the way along and we give a dedicated 1G link to the home, passive we use splitters and we can split each 10G port on this device 8 times, 16 times, 32 times, 128 times, sometimes 256 depending on distance.

Let's have a look at the business end of the RLT-1600X, we have our 2x power supplies, so our 48 V DC power, we have our 100G uplinks, 2 of them, we have our SFP28 25G uplinks that's 4 of them and then we have our SFP28 25G uplinks - 4 of them, and then we have our 16x XGS-PON ports, X is 10, G for Gigabit, and S is Symmetrical, so 10G up and down. This box can also do GPON, so each of those 16 ports can do GPON, which is 1.2G up and 2.4G down, and here we have our TimeSync, our console management, and alarm ports, and on the side here you'll see we have our fan unit.

In the coming weeks we're running a proof-of-concept with Radisys with an ISP so I'll just run you through what's going on here. We have our DC power, our 48 V power goes in here, on the front you're going to see our 16 XGS-PON OLT port, so again X for 10, G for Gigabit, S for symmetrical, so that gives us 10G up and down, and it can also do GPON which is 1.2G up, 2.4G back. In this case what we're doing is we've a 1 -> 2 splitter, we could have 1 to 8; 1 to 32, 1 to 64, 1 to 128, 1 to 256, but say we're going to split 64 times this one port is split down 64 times, so that means this box can give us 10 x 16, 16 x 64 gives us 10,240 residences that we can provide broadband access from this 1 box. On the box we've got CBAC (Connect Broadband Access Controller) which is a software from Radisys which was worked through the ONF (the Open Networking Foundation), and it uses VOLTHA which is Virtual OLT Hardware Abstraction, which again came out of that SEBA project within the ONF.

How does it work? We have our 10G port which we're going to split twice and into our ONT, so as I was saying if we had this box fully populated we could have 10,240 residences connected. We have 10G or 25G or 100G ports, we're going to use 10G so within within the Central Office you would have multiple of these OLTs and what we generally would do is aggregate them but in this case for a PoC we're just going to have one box with 10G uplinks, we're going to put them into 2x 10G interfaces on a server. This server will have the Radisys management system software on it, and also a DHCP server. That's the solution and we'll come back to you and explain to you after it's done and show you a working Central Office.

Unboxing the RLT-1600X OLT from Radisys

This is the RLT-1600X from Radisys and it's an OLT. OLT provides residential broadband or it's part of a solution that provides residential broadband, and we're actually going to show you the solution. This is the RLT-1600X from Radisys and it's an OLT. OLT provides residential broadband or it's part of a solution that provides residential broadband, and we're actually going to show you the solution.

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