patcat88
join:2002-04-05
Jamaica, NY
kudos:1 | reply to tiger72
Re: Backhaul? said by tiger72:How can VZ not dedicate x-mbps to their tower with QoS? It may not have the typical SLA, but last I checked, cellular services don't have one anyways. Cellular service doesn't have an SLA, the tower links sure do. Otherwise the telco will you have to wait 3 days before they can send a tech out to look at that fractional T3, and then the guys "in the network" gotta do their thing with an unknown ETA, and maybe they will fix it, otherwise the telco and you will have to open a new trouble ticket.
Also QOS isn't the end all. What about jitter caused by an ill placed FIFO buffer in a "consumer grade" ONT or OLT? What if the circuit board wasn't designed with real time/deterministic timing? Also the OLT does bandwidth arbitration for the upload. What if the bandwidth request loop takes too long? what if by chance all the ONTs send a request sequentially, can you guarantee that the OLT will always allocate 50kbit of bandwidth slice to the tower every 5 ms, or is it on a first come first served basis who gets that time slot in the PON standard? Does the PON standard have any possibility of a collision domain (if so, auto disqualified)?
What about maintenance? Does there exist a system to notify the FIOS subscribers/users of downtime in the trouble ticket system? is there an entry in the DB of a mandatory contact (VZW NOC) before touching the OLT or FDH?
What about redundancy? What about a SONET loop? cut any part of the loop, all nodes continue to work with no measurable service impact. What you going to do with FIOS? 2 fibers to the same FDH?
Plus LTE towers need atleast 50 mbitps of bandwidth. What if the area is still on BPON? You just permanently cut 1/3rd of the upload away to residential FIOS subscribers.
And what about the kevlar fiber? what about optical attenuation of the FO cable? Does anyone make a ONT with an industrial/mission critical Ethernet transceiver that wont lag or jitter? |
