Cisco uBR7100 Series Manual de usuario descargar pdf (Pagina 8)

Cisco Systems

Page 8 of 12

pace the application trafﬁc appropriately and approach

throughput commensurate with the subscriber’s deﬁned

QoS levels.

Guided and Scheduled Spectrum Management

The Cisco uBR7100 Series supports all DOCSIS and

EuroDOCSIS error correction encoding, modulation

types, and formats based on the router purchased. The

DOCSIS and EuroDOCSIS RF speciﬁcations deﬁne the

communicationspathsbetweentheCisco uBR7100Series

and the cable modems or set top boxes on the network.

The Cisco uBR7100 Series includes options that let you

specify different rules the system uses when encountering

noise. Frequency hopping is one option in which

upstream frequencies can be assigned as ﬁxed or in a

subband, and a hopping-decision criteria speciﬁed.

Reliability and Availability

The Cisco uBR7100 Series offers exceptional reliability,

availability, and serviceability. A ﬂash memory card

enhances reliability by storing backup software images

and conﬁguration ﬁles. Environmental monitors offer

levels of escalation so that you can take corrective action

prior to system shutdown.

Supplemental Technical Information

What is a broadband cable network?

Broadband networking is among the fastest growing

industries. Broadband networking opens the way to

information,entertainment,andincreasedproductivity.It

allows businesses to link remote locations to a central site

to unify operationsor expand servicesto consumers. You

can differentiate your services to consumers through a

broadband cable network that consists of:

• A headend which receives and processes signals from

various sources. The Cisco uBR7100 Series can serve as

an on-premises mini-headend to enable high-quality

television and IP-based service delivery. TV signals are

electromagnetic impulses that occupy space in the

frequency spectrum. They require some medium to

travel or propagate. Broadcast cable TVsignals, carried

on a cable system, travel through special types of cable

suchas hybridﬁbercoaxial(HFC)cable.EachTVsignal

travelsonadifferent frequency inside thecable.Coaxial

cable acts as a self-contained spectrum.

• Cabling:

– Trunk cables carry the signal through a city,

neighborhood, or vicinity

– Distribution or feeder cables connect to the trunk

cable and branch off to the remote areas served

– Drop cables connect the distribution orfeedercableto

the speciﬁc premises where the cables are attached to

equipment

• Terminal equipment—Consumer electronics that

include cable modems, set top boxes, PCs, TVs, and

other CPE; the function of a cable modem is to connect

broadband—the cable TV network—to Ethernet. Cable

modems modulate and demodulate signals. They can

act as a modem, tuner, encryption/decryption device,

bridge, router, Simple Network Management Protocol

(SNMP) agent, or Ethernet hub.

Ethernet cards are typically found in PCs. Once an

Ethernet card is installed, TCP/IP software is installed

on the PC to support connectivity. TCP is a protocol

used to control the rate of information transfer and

ensure reliable delivery ofdata between two computers.

The protocol controls the rate or ﬂow at which data is

transmitted between computers.

Figure 6 that follows depicts a typical cable broadband

network. High-speed IP data services can be packaged,

along with cable TV service. Channel capacity can be

allocated to support digital data between IP hosts and

connected subscribers—those accessing the network to

communicate or avail themselves of the services the

network offers.

1 2 3 4 5 6 7 8 9 10 11 12

Comentarios a estos manuales

Sin comentarios

Cisco uBR7100 Series Manual de usuario Pagina 8

Comentarios a estos manuales

Relacionado con productos y manuales para Redes Cisco uBR7100 Series