Transition Networks SM24-1000SFP-AH, Installation Manual

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2-1
Chapter 2: Network Planning
Fiber-To-The-Home (FTTH)
Fiber-To-The-Home (FTTH) has always been an attractive option for Internet
access. It has all the benefits of optical fiber. It provides a future-proof network by
avoiding the hassle of having to upgrade from ADSL to XDSL, or digital coax to
digital wireless. It is highly reliable because it eliminates all of the problems with
electromagnetic interference. Moreover, it is immune to lightning and other
transients. These properties of fiber lead to the lowest possible power and
operational costs, such as maintenance, provisioning and facilities planning.
This switch and a standard CPE (Customer Premises Equipment) form the key
components of an ideal FTTH system, allowing a service provider to easily extend
an Ethernet connection over optical fiber directly to a subscriber. This switch
contains 24 Gigabit Ethernet SFP slots for full-duplex duplex-fiber multimode cable
connections that run from the service provider’s central office (CO) directly to the
subscriber’s CPE. 1000BASE-SX transceivers support downlink connections to the
subscriber which can run up to 550 meters. While 1000BASE-LX/LH transceivers
support uplink connections to the CO or downlinks to intermediate aggregation
nodes which can run up to 10 or 40 km, respectively.
The switch also provides two 10-Gigabit Ethernet XFP slots for connections to other
switches or routers at intermediate aggregation points or at the CO. 10GBASE-ER
transceivers allow the switch to be located up to 40 km from the CO, giving you the
option of placing the switch either in the CO or anywhere along the path between the
CO and the subscriber.
A CPE is a single-channel fiber-to-copper conversion unit. The CPE connects to the
fiber cable from the CO and provides one standard 10/100BASE-TX RJ-45 Ethernet
port for connecting to a subscriber’s residential gateway, PC, switch, or other
network device using twisted-pair cable. Depending on the service provider’s
offerings, a CPE may also include VoIP POTS ports for VoIP connections over
standard phone cable.