参数资料
型号: PM7351-BI
厂商: PMC-SIERRA INC
元件分类: 数字传输电路
英文描述: OCTAL SERIAL LINK MULTIPLEXER
中文描述: ATM/SONET/SDH SUPPORT CIRCUIT, PBGA304
封装: 31 X 31 MM, 1.51 MM HEIGHT, 1.27 MM PITCH, SBGA-304
文件页数: 16/174页
文件大小: 1790K
代理商: PM7351-BI
RELEASED
PM7351 S/UNI-VORTEX
DATA SHEET
PMC-1980582
ISSUE 5
OCTAL SERIAL LINK MULTIPLEXER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
6
In the downstream direction the equipment must handle a similar issue, the “big
pipe feeding little pipe” problem. When a large burst of traffic destined for a
single line port is received at the high speed WAN port it must be buffered and
managed as it queues up waiting for the much lower speed line port to clear.
The line cards are always the most numerous cards in this type of equipment.
An individual line card, even if it terminates a few dozen low speed ports, does
not generate or receive enough traffic to justify putting complex buffering and
traffic management devices on it. The ideal architecture has low cost “dumb”
line cards and a feature rich, “smart” core card. In order to enhance fault
tolerance, the architecture should also inherently support 1:1 protection using a
redundant core card and WAN up-link without significantly increasing line card
complexity.
A system architecture that keeps buffering and traffic management off the line
card will typically exhibit the following features:
1. Connection setup is simpler both in terms of programming and during
execution because there is minimal or no requirement for line card
intervention during the connection setup process.
2. In-service feature upgrades are simpler because feature complexity is
limited to the common equipment.
3. Component costs are reduced, while system reliability increases due
to reduced component count.
In this type of architecture there are often three stages of signal concentration or
multiplexing, as shown in Fig. 2.
相关PDF资料
PDF描述
PM7364 Frame Engine and Datalink Manager
PM7364-BI FRAME ENGINE AND DATA LINK MANAGER
PM7366 FRAME ENGINE AND DATA LINK MANAGER
PM7366-BI TVS BI-DIR 30V 1500W DO-201
PM7366-PI FRAME ENGINE AND DATA LINK MANAGER
相关代理商/技术参数
参数描述
PM-736 制造商:Eclipse Tools 功能描述:
PM7364 制造商:PMC 制造商全称:PMC 功能描述:FRAME ENGINE AND DATA LINK MANAGER
PM7364-BI 制造商:PMC-Sierra 功能描述:PROTOCOL CONTROLLER, 256 Pin, BGA
PM7366 制造商:PMC 制造商全称:PMC 功能描述:FRAME ENGINE AND DATA LINK MANAGER