... ports enables OTDRtrace development upstream to the central office and downstream to the access terminal. Also, the connector ports available at the distri-Chapter 3 — Advantage of Centralized ... Networks7FTTX: A Practical Guide www.adc.comCounty, Virginia, a fast-growing suburb of Washington, D.C.; along with a New York City suburb Massapequa Park, New York.; and a communityoutside of Tampa, Florida.SBC, ... first PON standard was APON, which uses ATM encapsulation oftransported data and is aimed primarily at small business applications.Over time, APON was followed by BPON.BPON (Broadband PON)Currently...