[Figuring out GTE]
Reading GTE's homepage describing its ADSL, it appears as though they're offering CAP first, however, what puzzles me is that none of Westell's or Amati's solutions is generally referred to by "1.544Mbps down and 640Kbps up." The original FlexCap runs at 1.544 down and 64Kbps up. FlexCap2 runs at 640 kbps to 2.24 Mbps down and 272 kbps to 1.088 Mbps up, certainly encompassing those speeds but not ususally designated in that way. If it's DMT, it would have to be the Allegro 810 because of the upstream rates, unless the "future version" of the Overture 8 running at 640Kbps is already out.
GTE's description:
<<<ADSL's asymmetric speeds (1.544 Mbps from the network to the end-user and 640 Kbps from the end-user to the network) will be ideal for Internet access and Web surfing, or downloading Web pages and large graphics files in just seconds.>>>
gte.com
From Amati's homepage:
Overture 8:
>>>The Overture 8 ADSL/DMT modem provides high-speed transmission for data over standard phone lines while still permitting voice traffic on the same connection. The Overture 8 for Internet Access provides 8 Mbps of data transmission downstream and up to 384 Kbps upstream data transport at the CSA standard line length. Future versions of the product will transport upstream data at rates up to 640 Kbps. The Overture 8 modem can adapt for service over longer subscriber lines providing connections at rates of 1.5 Mbps/160 Kbps up to 18000 ft.
Allegro 810:
Model 810 System Features
- Standards Based ADSL/DMT design
- 8 Mbps and 640 Kbps asymmetrical T1.413 (Category 2) data rates
- Dual Data Channels per ADSL Connection
- 10BaseT or RS422 (with clock source)
- Advanced, low power design including power cutback
- Optional data interleaving for video reception
- Maximum of 2 downstream channels and 2 upstream channels supported plus out of band OAM control channels
- Compatible with Amati SNMP Management Interface
- Plug-in card for Allegro Access Concentrator
n Stand-alone Design for remote subscriber
Model 810 Remote Modem Electrical Specifications
Line Code
ADSL standard: DMT T1.413, ETSI DTR/TM-03050
Maximum package size 11" x 7" x 2.25" (POTS splitter external)
Power supply External DC module
Dual data channels per modem, data rate options available:
Downstream: 8192, 6144, 4096, 2048, 1536, 576, 384, 256, 160 Kbps
Upstream: 640, 576, 384, 256, 160 Kbps
Electrical interfaces
ADSL Standard: 10BaseT (RJ45) or RS422 (RJ45)
Range
CSA range standard compliant
Coding
Downstream: Reed-Solomon, FEC & trellis
Upstream: Reed-Solomon & FEC
Line multiplexing technology
Echo-cancelled
Latency (end-to-end)
Downstream: 10 or 20 ms (interleaved), 2.5 ms (not interleaved)
Upstream: 10 or 20 ms (interleaved), 2 ms (not interleaved >>>
From Westell's homepage:
FlexCAP ADSL
<<<This is an enhanced ADSL product which provides 1.544 Mbps downstream and a bi-directional control channel up to 64 kbps.
The range on 24 AWG cable is up to 18 kft.
FlexCAP supports Video and Data Dialtone.
The data version of FlexCAP supports Data
Dialtone( services with Ethernet bridging and
routing for LAN and Internet access. FlexCAP
also has a V.35 interface option for Data
Dialtone services with various customer
equipment interfaces (routers, switches,
multiport hubs, etc.).
FlexCap2:
The FlexCap2 system operates at rates from 640 kbps to 2.24 Mbps downstream and 272 kbps to 1.088 Mbps upstream. The unique rate adaptive capability adjusts the rate to run at the highest possible speed, based on the length and signal quality of the telephone line, thus extending the delivery of high-speed data service to more customers.>>>
I know it no longer matters, but I'm still curious. :)
Pat |
