iMG/RG Software Reference Manual (Preface)
i-6
There is also a subset of this family of devices that support RF Overlay. These are derivations of base models -
with an “RF” suffix in the model name. This is supported by the addition of a second fiber and an optical
module that supports Analog Fiber to RF Conversion. The devices are connected to the WAN via a dual
single-mode fibre optical interface: one fibre delivers triple-play services similarly to the iMG613BD, the second
fibre receives the video broadcast channels.
The separated passive unit named RG001 where the optical cable is terminated, allows easy installation,
maintenance and replacement thanks to a plug-and-play optical connection.
V.III
Passive Optical Network Fiber Gateways
Allied Telesyn has expanded the portfolio to include an EPON Active Fiber Outdoor Gateway. This device is
an evolution of the Active Fiber Outdoor Gateway - supporting 6 Ethernet 10/100TX ports and 4 voice ports.
A passive optical network (PON) is a point-to-multipoint, fiber to the premises network architecture in which
unpowered optical splitters are used to enable a single optical fiber to serve multiple premises, typically 32-128.
A PON consists of an Optical Line Terminal (OLT) at the service provider's central office and a number of
Optical Network Units (ONUs) near end users. A PON configuration reduces the amount of fiber and central
office equipment required compared with point to point architectures.
Downstream signals are broadcast to each premises sharing a fiber. Encryption is used to prevent
eavesdropping.
Upstream signals are combined using a multiple access protocol, invariably time division multiple access
(TDMA). The OLTs “range” the ONUs in order to provide time slot assignments for upstream
communication.
V.IV
Active Fiber Business Gateways
Allied Telesyn Active Fiber Business Gateways offer a full range of optical interfaces via an SFP or 100M TX
interface to fit the requirements of FTTx or MDU applications. This family boasts higher performance and a
larger number of Voip interfaces. Being AC Powered - it is perfectly adapted for installation in business or
MDU applications:
TABLE i-2
Active Fiber Gateways with RF Overlay
OPTICAL PARAMETER
Fiber to Eth/VoIP
Fiber-to-RF
Fiber type
Single-mode
Single-mode
Operating wavelength
TX 1310 nm
RX 1550 nm
RX 1550 nm
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