5
ADSL provides a dedicated service over a single telephone line operating at
speeds of up to 8 Mbps downstream (to the user) and up to 1 Mbps upstream
(to the ADSL service provider’s central office). Actual data rates depend on the
transceiver implementation, loop length, impairments, and transmitted power.
These conditions are ideal for many time sensitive user applications. A secure
point-to-point connection is established between the user and the central office
of the ADSL service provider. The user is always connected thus eliminating
dial-up time and simplifying connectivity issues.
TW-EA400 ADSL Router device is based upon a scalable architecture. This
architecture enables the device set to support splitterless G.lite as well as
splittered and splitterless full-rate ADSL. G.lite enables telephone companies
to deploy consumeroriented, “always on” 1.5 Mbps Internet access services
without the need for splitter equipment, micro-filters, or wiring changes at the
customer premises.
1.3 Product Features
The TW-EA400 ADSL Router utilizes the latest ADSL enhancements and
router technologies to provide a robust Internet gateway suitable for most
small to medium sized offices.
z
ADSL
Compliance
9
Compliant with ADSL standards
Full-rate ANSI T1.413 Issue 2 and ITU G.dmt (G.992.1)
standards
Splitterless ITU G.lite (G.992.2) specification
ADSL over POTS (Annex A) and ADSL over ISDN (Annex B)
9
DMT
modulation and demodulation
9
Full-rate adaptive modem
Maximum downstream rate of 8 Mbps
Maximum upstream rate of 1 Mbps
9
Tone detection for low power mode
9
Supports splitterless ADSL implementation
9
Supports Dying Gasp
z
ATM
Protocols
9
WAN mode support: PPP over ATM (RFC 2364) and PPP over
Ethernet (RFC 2516)
9
LAN mode support: bridged/routed Ethernet over ATM (RFC 1483)
and Classical IP over ATM (RFC 1577)
9
ATM Forum UNI 3.1/4.0 PVC
9
Up to 8 VCs (Virtual Circuits)
9
ATM SAR (Segmentation and Reassembly)
9
ATM AAL5 (Adaption Layer type 5)
9
OAM
F4/F5
z
Bridge
Mode
9
Ethernet to ADSL self-learning Transparent Bridging (IEEE 802.1D)
9
Supports up to 128 MAC learning addresses
