To: Jeff Jordan who wrote (25125 ) 12/1/1997 10:18:00 PM From: Glenn D. Rudolph Read Replies (1) | Respond to
Jeff,
This is the modem I own and the specs:
LCw
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Workgroup Cable Modem
Four User Worgroup Cable TV Data Connectivity
LANcity's LCw workgroup modem enables the small business or multiple PC
home to access a high speed city-wide cable TV data network. Locations
with a small workgroup of PCs can enjoy real-time interactivity not
possible with slower telephone modem technology. Productivity is
increased as information retrieval and exchange speeds up, with less
time spent waiting for the data to move from one location to another.
With a full 10 megabit operation upstream and downstream, the LCw
provides an application independent cable TV network architecture. No
longer is technology the limiting factor in the types of services that
are provided. LANcity modems enable the cable operator and his customer
base to define the killer app that is right for them, be it work at
home, Internet access, web page provisioning, video conferencing, or
city-wide LAN interconnection.
LANcity goes beyond providing a high performance communication device.
Imbedded in the product family are many features pioneered by LANcity to
reduce the cost of installation and maintenance.
Plug and Play technology, SNMP management, an OSS/BSS provisioning
server are just some of the technologies that enable the cable operator
to provide a robust and cost effective service to his customer base.
The LANcity LCw is a full bridging devices that forwards only to known
destination addresses. Information on the cable TV channel is isolated
from the Ethernet port unless destined for a device on that port.
Unauthorized access to information and content is prevented, assuring
subscribers and operators security and privacy in their communications.
Additionally, only authorized personnel can manage and control the
LANcity data network. Every cable modem has built-in authentication
algorithms that prevent management by unauthorized devices.
Excellent RF characteristics on the transmitter and receiver coupled
with adaptive equalization and automatic power adjustment provide robust
operation, even in the harshest of environments. Truck rolls, because of
cable plant variations, are eliminated because each cable modem
periodically readjusts itself to provide optimum operating performance.
Information available from each cable modem using SNMP management allows
the cable operator to diagnose many modem and cable plant related
problems remotely.
As the leading designer and manufacturer of cable TV based data
networking solutions, LANcity is the only company that provides an
application independent solution that minimizes the cost of installation
and maintenance.
LCw User and Operator Friendly Features
The LANcity LCw one to four user cable TV data modem includes a rich set
of features that provides the highest performance for the end user and
the lowest cost of operation for the cable operator.
Functionality:
* Adaptive Equalization compensates for channel effects
* Transmit and Receive Data Bandwidth Provisioning
* Automatic transmit level adjust reduces truck rolls
* Ethernet DCE 10BT connectivity (AUI available)
* Cable Modem Plug and Play technology
* One to Four User Cable TV modem
* Best of Breed RF Specifications
* Workgroup bridge functionality
Lowest Cost of Maintenance:
* Standard SNMP management for configuration and control
* Integrated OSS/BSS support thru LCn provisioning server
* Software upgrades over the network
* Information rich cable TV MIB including
* transmit and receive levels in dbmvs
* Inchannel group delay and tilt
* Good and errored packet count
Security:
* Source authentication of operational parameters
* Full bridge data filtering for data privacy
* Authorized cable modem access only
* Secure SNMP network management
Installation and Operating Environment:
* Desktop mounting, either horizontal or vertical
* Slimline package/standalone power supply
* Dimensions: 2.6 x 6.6 x 10
* Weight: 6 lbs
* Fanless operation
* Operating Temperature: 0 to 40 degrees C
* Storage Temperature: -40 to +66 degrees C
* Humidity: 10% to 90% non-condensing
* Input Voltage: 88 to 264 Volts, 47 to 63 Hz
* Input Power: 20 watts max
Performance:
* Filtering rate: 14,000 pkts/sec
* Forwarding rate: better than 8,000 pkts/sec
* Distance features:
* Round trip delays to 1.25 msec
* Typical coax up to 200 miles
* Typical fiber up to 160 miles
RF Electrical Specifications:
* Data Rate: 10 Mbps transmit and receive
* Modulation: Quadrature Phase Shift Keying (QPSK)
* Output Impedance: 75 Ohms nominal
* Spectral Efficiency: 1.67 bits/Hz
Regulatory Specifications:
* UL, CSA, FCC B, EN60950, EN55022, EN50082-1
* Pending: VCCI Class 2
Transmitter Specifications:
* Frequency range: 5 to 42 MHz (band edge to band edge)
* Frequency agile; adjustable in 250 KHz increments
* Bandwidth: 6 MHz
* Power, range: +30 dBmV to +57 dBmV
* Power, accuracy: ñ 1.5 dB
* On/Off ratio: better than 75 dBc
* Spur energy, modem on: better than 50 dBc / 5 MHz
* Spur energy, modem off: better than 80 dBc
* Discrete spurs, modem on: better than 60 dBc
* Return Loss: 10 dB over operating frequency
Receiver Specifications:
* Frequency range: 54 to 750 MHz (band edge to band edge)
* Frequency agile; adjustable in 250 KHz increments
* Dynamic Range: -15 dBmV to +15 dBmV
* Carrier to Noise: better than 22 dB for 1 in 109 BER
* Carrier to Interference: better than 25 dB for 1 in 109 BER
Cable Television Network Requirements:
* Amplitude variation inband
* Forward channel: 1 dB/MHz, 5 dB total
* Reverse channel: 1 dB/MHz, 5 dB total
* Group delay variation inband
* Forward channel: 60 nsec/MHz, 240 nsec total
* Reverse channel: 200 nsec/MHz, 800 nsec total
* Tap to tap variation: less than 27 dB
EQUIPMENT IS SUBJECT TO FCC PART 15 RULES AND SHALL COMPLY WITH
APPROPRIATE RULES PRIOR TO DELIVERY. LANCITY RESERVES THE RIGHT TO
CHANGE THESE SPECIFICATIONS AT ANY TIME WITHOUT NOTICE.
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URL is :
sousaphone.lancity.com
Glenn
