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I've been monitoring the discussion on the EFM reflector and appreciated your well considered contribution. My question is, why do you assume the "sweet-spot" is 10km at 1Gbps??? I would assume there's a sweet spot for business at 1:8 or 1:16 split in the range of 20km and delivery of approx. 1000Mb per subscriber. The greater distance allows an initial network deployment to cover a long route (most businesses being deployed along a highwa over 5-10 km for a single PON).
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From: Carlisle, Robert S [mailto:CarlisleRS@xxxxxxxxxxx]
Sent: Wednesday, June 06, 2001 2:03 PM
Cc: Du, Xueping; Feng, Weiwei; Jay, John; Kunzi, Anne; Musgrove,
Kendall; Propst, Jeanne; Shaneman, Keith; Sweazey, Chad
Subject: FW: Relative OSP Costs of PON vs. P2P
The other reflector set up for discussing PON vs P2P costs doesn't seem to be working, so I'm sending this to this forum for dissemination and discussion.
> From: Carlisle, Robert S
> Sent: Wednesday, June 06, 2001 12:58 PM
> To: 'efmoptics@xxxxxxxxxxxxxxxxxxxxxxx'
> Subject: Relative OSP Costs of PON vs. P2P
> I wanted to share some relative Outside Plant (OSP) costs based on calculations from analysts here at HQ and my colleagues at Corning Cable Systems. Based on fixed electronics cost at the Head End (HE) and in the customer premises (CPE), the relative cost of the OSP is about 41% of the total cost for 1 fiber to the home and 52% of total cost for 2 fibers for a Point to Point network. For a PON, the relative cost of the OSP is about 13-18% of the total cost. In other words, OSP costs for a P2P network are roughly 2X the cost for a PON. OSP costs include the feeder and distribution cables, splices and connectors, trenching and/or drops, and splice enclosures. Of course, as the cost of the electronics at the HE and at the CPE drop, the relative cost of the OSP will go up. What I don't know and would like to see some discussion on, is the difference in the cost of the electronics in the HE for a P2P vs. PON. I expect that since the management functions of a PON are more complex, the costs of the electr
> I also wanted to share an Excel graph showing the upstream reach of a 1500 nm FP in a 1X16 split EPON. Assumptions made:
> * 21 dBm power budget between the TX and RX (0 dBm TX and -21 dBm receiver sensitivity @ 1 GBPS).
> * Losses to splices, split, connectors, and 4 dB link margin - 20.4 dB
> * Spectral width of FP laser - 5 nm
> * Attenuation of fiber @ 1500 nm - .21 dB/km (vice .34 at 1310)
> Take aways from this:
> Dispersion limited using standard single mode fiber so consider using dispersion shifted fiber if desirable to use cheaper FP laser in CPE.
> Does not reach the sweet spot of 10 km @ 1 GBPS so:
> Must live with lower link margin or
> Increase power of laser or
> Increase sensitivity of receiver
> Is this technically feasible?
> > <<exportablelink.xls>>
> Best Regards,
> Rob Carlisle
> Rob Carlisle
> Senior Market Development Engineer
> Optical Fiber
> v: 607 974-6806
> f: 607 974-7522
> c:607 368-5442