Juniper Networks G10 CMTS manual System Overview, System Description

Chapter 1

System Overview

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

System Description

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