You can get in the situation when more POTS ports than 2 (like for this HGU type ONU) are needed. That could be a small office customer or building with more flats. It may also support a few TDM (time division multiplex) services such as DS1 or E1, via pseudowire emulation. This SBU from Fiberbit:
For example can have 16 FXS POTS ...
MDU - Multi Dwelling Unit EPON ONU's - are ONU's that usually will serve more than one subscriber, more than one home and unlike of SFU - Single Family Unit ONU, will be usually deployed at apartment building, a condominium complex or at the curbside - that is a scenario sometimes called FTTB or FTTC. And while in SFU case ...
Apart from a regular scheme with series of 1:N splitters in FDN, some networks, especially those with industrial grade for power, gas or electricity providers, require equipment and some network design skills to provide backup schemes for your PON network.
Theoretically there is a 3 ways to provide such kind of backups:
1. Protecting fiber damage - in this case 2:N type ...
According our statistics, Single Family Unit's, or SFU's are most popular EPON ONU's ordered and shipped worldwide, and it really does not depends on a market or country. Of course, types of SFU's vary.
For example as one classifier, SFU's can be divided in Indoor Type ONU's, or in Outdoor type. If we look at various business models used by FTTx ...
Some time ago we discussed Layer 1, or physical layer in PON communication systems. Now, in terms of OSI model, access network, and PON networks are access networks at it's best, exists at Layer 2. Because when we talk about Layer 2 - we usually mean Virtual Local Area Networks, or VLAN's, which is a core terms for Ethernet based ...
Layer 1 - or physical layer in OSI model, is basically built on a one single model type - single fiber, and each ONU has 1 fiber connected (not including the 1+1 backup cases, which is a special case, and will be reviewed in more details in our blog.
Heart of the any GPON or EPON network is OLT - Optical ...
