System Overview; System Description - Juniper G10 CMTS Hardware Manual

Chapter 1

System Overview

System Description

This chapter provides an overview of the G10 CMTS.
! System Description on page 3
! Field-Replaceable Units (FRUs) on page 6
! G10 CMTS Features and Functions on page 7
! G10 CMTS Components on page 8
! G10 CMTS Management on page 10
! G10 CMTS Hardware Overview on page 10
The JUNOSg software runs on the G10 cable modem termination system (CMTS) and
provides both IP routing (Layer 3) and IEEE 802.1 bridging (Layer 2), as well as software for
interface, network, cable services, and chassis management. The G10 CMTS manages
Internet voice and data. It functions as the interface between the service networks—Internet,
Public Switched Telephone Network (PSTN)—and the hybrid fiber/coax (HFC) network of
subscribers, as shown in Figure 1 on page 4. This is the "last mile" of broadband service, with
the CMTS typically located in the cable headend or distribution hub. It is targeted at the
following data and voice aggregation applications:
! Large CATV hub sites—DOCSIS multiservice, residential, and commercial IP network
access over HFC networks maintained by cable television (CATV) multiple service
operators (MSOs) needing enhanced integrated data, voice, and video in large
metropolitan areas.
! Small CATV hub sites—Smaller hub sites aggregated over metropolitan fiber rings
supporting Gigabit Ethernet.
Figure 2 on page 5 illustrates a typical cable headend architecture.
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System Overview 3