PM7350 データシートの表示（PDF） - PMC-Sierra

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PM7350

DUAL SERIAL LINK PHY MULTIPLEXER

PMC-Sierra 

RELEASED

DATA SHEET

PMC-1980581

ISSUE 5

PM7350 S/UNI-DUPLEX

DUAL SERIAL LINK PHY MULTIPLEXER

4 APPLICATION EXAMPLES

When designing communication equipment such as access switches,

multiplexers, wireless base stations, and base station controllers the equipment

architect is faced with a common problem: how to efficiently connect a large

number of lower speed ports to a small number of high speed ports? Typically, a

number of line-side ports (analog modems, xDSL modems ATM PHYs, or RF

modems) are terminated on each line card. Numerous line cards are then

slotted into one or more shelves and backplane traces or inter-shelf cables are

used to connect the line cards to a centralized (often 1:1 protected) common

card, hereafter referred to as the core card. The core card normally includes one

or more high speed WAN up-link ports that transport traffic to and from a high

speed broadband network.

A block diagram of a 1:1 redundant system is shown in Fig. 1.

Fig. 1 Typical Target Application

Modem

or PHY

Modem

or PHY

Modem

or PHY

Line Card #1

S/UNI-

DUPLEX

S/UNI-

VORTEX

Policing

OA&M

WAN Card

Buffering

Discard

Scheduling

OA&M

WAN

up-link

Modem

or PHY

Modem

or PHY

Modem

or PHY

Line Card #N

S/UNI-

DUPLEX

S/UNI-

VORTEX

Policing

OA&M

WAN Card

Buffering

Discard

Scheduling

OA&M

WAN

up-link

In this type of equipment the majority (perhaps all) user traffic goes from WAN

port to line port, or from line port to WAN port. Although the individual ports on

the line cards are often relatively low speed interfaces such as T1, E1, or xDSL,

there may be many ports per line card and many line cards per system, resulting

in hundreds or even thousands of lines terminating on a single WAN up-link. In

the upstream direction (from line card to WAN up-link), the equipment must have

capacity to buffer and intelligently manage bursts of upstream traffic

simultaneously from numerous line cards.

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

5

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