User's Manual

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System Configuration Introduction – p. 10
Chapter 1. System Configuration
Introduction
This guide is intended as a practical aid for the Technicians, Operators and Field
Service Engineers responsible for quickly configuring Vyyo systems at most
common installations. It is not intended as a substitute for a detailed reference
manual.
NOTE: Througout this manual the terms modem and
WMU are used interchangeably. The term “WMU” refers
to “Wired/wireless Modem Unit”. In some instances the
actual modem model (V280, V301, etc.) may be used if
the information is specific to that modem.
The term “XMTS” is used interchangeably with “WMTS”.
XMTS is an acronymn for “Xtend Modem Termination
System” and will replace WMTS , “Wired/wireless Modem
Termination System”.
1.1 Overview
The system acts as an RF bridge between a network, typically the Internet or the
Public Switched Telephone Network (PSTN) (at the head end) and customer
equipment at the other end of the RF link.
It may be visualized as a three layer protocol stack. The highest layer may be
any one of the following: IP, E1/ T1 or PSTN.
All systems include the IP capability, which is required for network management.
The E1/T1 capability requires an additional plug-in card at the XMTS
(Cable/Wireless Modem Termination System) end and a corresponding
cable/wireless modem at the downstream end.
Internet
or
PSTN
Hybrid Fiber/Coax Cable Network
Customer Premises
XMTS
Cable
Modem
(CM)
Customer
Equipment