General data communication
- Networking of schools, companies, offices, hospitals...
Regional Online service
- build own homepages
- social services
- training and education
- and much more...
Fast Online - Internet access
- Up to 10,000,000 bits per sec. data communication

The advantages

Additional use of already existing infrastructures
First step for positioning a telecommunication service
Increase of the attractiveness of the cable connection
Generation of additional revenues
Differentiation to oppositional satellite contributors or telecommunication services

Prerequisites

Reverse channel capable infrastructure from the backbone to the antenna socket
Adherence to the HF specifications after the network parameters check list
Allocation of the cable system into physical cells (100-500 customers per cell)
A free TV channel (forward direction)
Efficient Internet provider

End to end CATV data network solutions

10.000.000 bits per second - data communication over CATV

Certified for world-wide data communication, Nortel Network offers a complete end to end system with their LANcity products to build a high-speed data network for HF cables and optical fiber. You only need a modem and an Ethernet PC card on the customer side to participate in a LANcity network.

CATV projects in Austria planned and installed by WITKE Ltd.

Ing. Witke Ltd. already sold and installed more than 45 headends in Austria. In general our satisfied customers bought over 7000 modems from us.

Our first customer in the west http://www.telfs.com
Equipped with a Proxyserver from Witke Ltd. this Provider supplies approx. 300 customers since December 1997.

Nortel Networks LanCity product line

CATV customer solutions:

LCP - CATV Modem for up to 16 user

CATV cable system operator solutions:

LCT - frequency converter
LCH - data channel controller
LCN - data channel server
LCE - integrated headend

Specifications:

LCT Transmaster
input frequency range: 8.75 to 450MHz; adjustable from 0 to -10dBmV
output frequency range: 51 to 550MHz; adjustable from 30 to 50dB
bandwidth 6MHz (5.2MHz at 3dB)
LCH Headend Node
In this unit the digital information is edited for the transmission onto the CATV network.
LCE Headend Equipment
Consists in principle of two separated LCT's, two separate LCH's with two power packs and a Diplexer. En eventual diplexer for the second channel has to be installed separately.
LCN Provisioning Server
LCN is based on a relational Microsoft Access data base. All Client and modem adjustments are made via CATV. As also network parameters and user access rights are managed via CATV. Automatic IP addressing and Routing; E-Mail service; Gopher and WWW service.
Hardware prerequisites: 486 CPU, 8MB RAM, Windows 3.1x or higher (95, NT) and a LCx modem.
LCP Personal CATV Modem
personnel modem, plug&play technology.

LanCity LCN specifications

data transmission rate 10Mbit/s, type of modulation: QPSK, impedance 75 ohms
Transmitter:
- Frequency range: from 5 to 42MHz
- 250kHz steps with a bandwidth of 6MHz.
- Automatic transmission level adjustment: from +30dBmV to +57dBmV.
Receiver:
- Input range: from 54 to 750MHz adjustable in 250kHz steps
- Dynamic range: from -15dBmV to +15dBmV
- Carrier to Noise: better than 22dB for BER 1E-8
- Carrier to Interference: better than 25dB for BER 1E-8
Power supply: 88 to 264 V with 47 to 63 Hz
Operating temperature: 10°C bis 40°C

Single user LANcity CATV modem

Euro-DOCSIS

DOCSIS: Data Over Cable Service Interface Specification

The DOCSIS standard is vendor independent and enables joint networks with devices from different manufactures.

In contrast to the American version with 8MHz sender bandwidth, EURO-DOCSIS operates with 6MHz.

In the picture you can see an operational test of 10 DOCSIS modems from different manufacturers.

Euro-DOCSIS headend specifications

CMTS (Cable Modem Termination System)

Downstream
- Channel bandwidth: 8MHz
- Frequency range: 88 to 860 MHz
- PAL ZF output: therefore Upconverter (modulator) necessary
- Type of modulation:
Upstream
- Bandwidth: 200kHz to 3.2MHz
- Frequency range: 5 to 42 MHz
- Type of modulation: QPSK or QAM16
- Input level: -4 to +26dBmV
- Datenrate 0.32 bis 10.24 Mbit/s (without FEC)
- FEC (Forward Error Correction) error correction with RS(Reed Solomon)- block code & trellis code
Security
- Filter:
- optional key encryption possible
Supports QOS (Quality Of Service)