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In order to be able to set-up PPPoE sessions we first need a L2 link between the head-end and the consumers CPE. AE and microwave links provides this out-of-the-box. In the case of DSL one can configure the DSLAM, such that the DSL modems are directly bridged and from the head-ends perspective don't look any different to devices using AE or microwave links. For the most DLAMs DSLAMs we have seen, one only needs to configure this bridging once and it is automatically established for all modems, that will be connected to the DSLAM later on.
GPON however is a different matter. The OLT OLTs we have been using so far have greater complexity when it comes to provisioning ONTs. Using a protocol used between the OLT and the ONTs (e.g. OMCI) one can configure lots of settings, among others the throughput, VLANs, phone numbers and CATV. However, these settings are proprietary and thus highly dependent on the devices and vendors being used. Sometimes they even change between different firmware versions. This leads to a lot of incompatibilities, such that you won't be able to use any ONT with any OLT. Furthermore, the commands need to be run via Telnet or SSH, which can make this system unreliable (as the command-line options may change between devices of the same vendor and different firmware version) and potentially vulnerable to man-in-the-middle attacks due to the unencrypted nature of Telnet.
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In summary we want touch the intermediary systems (switches (AE), base stations (microwave links), DSLAMs (DSL) and OLTs (GPON)) as little as possible by setting them up with a default configuration, which enable an L2 link the between the CPE and our head-end with maximum throughput, which will later be limited by our BRAS/BNG to the actual subscribed throughput. The CPEs are configured via TR-069/CWMP. We already have configuration suggestions for common DSLAMs and OLTs and will extend them in the future. The same is true for TR-069/CWMP provisions for the CPEs. The latter can be easily modified and added by you using a very simple syntax.
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Using DSL it is not usually the case, that modems use DHCP is as their default means of getting an IP address. That is why many modem vendors either supply a default ACS server location and default PPPoE credentials for all their modems. The latter typically are identical among all the modems. This means one can set-up a default PPPoE account in NMS Prime for factory-new DSL modems. This way they will be able to get an IP address via PPPoE and to communicate to the ACS server to get their actual PPPoE credentials and other settings. The ACS server location is usually preconfigured by the manufacturer using a hostname such as acs.example.test. Because we control the nameserver, which is given to the PPPoE clients (i.e. CPEs) during PPPoE seesion session set-up, we can configure according A/AAAA DNS records, such that the CPE will connect to our ACS server.
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