User guide

i-5
iMG/RG Software Reference Manual (Preface)
V Gateway Types
V.I ADSL Gateways
Asymmetric Digital Subscriber Line (ADSL) is used to provide cost-effective, high speed local loop access for
Internet and other applications where data flows downstream to end users faster that it does upstream from
end users. ADSL provides asymmetric transmission over one pair of copper telephone wires with downstream
data transmission rates ranging from 32 Kbps to 26 Mbps with ADSL2+. One single telephone line can be used
simultaneously for voice and data transmission.
The ADSL interface is designed to meet the following standards:
• ANSI T1.413 (8 Mbps)
• ITU G.992.1Annex A also known as G.dmt (10 Mbps)
• ITU G.992.2 also known as G.lite (4Mbps)
• ITU G.992.3/4 also known as ADSL2 or G.dmt.bis (12Mbps)
• ITU G.992.5 also known as ADSL2+ (24 Mbps).
These gateways typically support 4 Ethernet 10/100TX ports plus 2 Voice ports.:
V.II Active Fiber Gateways
Allied Telesis Active Fiber Gateways offer a full range of optical interfaces to fit the requirements of FTTx
applications. In full compliance with the optical performance requirements of 100 Base-FX version of IEEE
802.3u, both multi-mode and single-mode fibers are available. In addition, the bi-directional optical interface
over a single fiber, allows the best exploitation of the cabling infrastructure.
These gateways support from 3 to 6 Ethernet 10/100TX ports plus 2 to 4 voice ports and are available in both
indoor and outdoor versions.
TABLE i-1 Active Fiber Gateways
OPTICAL PARAMETER SH LH BD
Fiber type Multi-mode Single-mode Single-mode
Operating wavelength 1300 nm 1300 nm TX 1310 nm
RX 1550 nm