Reference Only Allayer Confidential Managed Media Converters Usin

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Reference Only Allayer Confidential Managed Media Converters Usin

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APPLICATION BRIEF MANAGED MEDIA CONVERTERS USING AL210
Reference Only Allayer Confidential
Managed Media Converters Using AL210
Introduction
This application brief explains different approaches building managed media converters. past, media converter device that enabled installer connect fiber copper port. However, because availability silicon, media converter typically function seamless transparent connecting device. Even though Ethernet protocol allows integrity check media, fault condition isolated from network network manager. This made network diagnostic very difficult. Today's media converter chip (e.g. AL210), because higher integration, allows features such fault propagation redundant fiber link implemented easily economically. This enables network more resilient eases media trouble-shooting task. ability manage media converter through management agent, although necessity, will make management easier. Trouble shooting configuration accomplished from management console.
Functional Requirement
media converter switch hub; piece logical wire. There real need know many packets what size packets that through These statistics maintained network hub. real need configuring reporting status media converter.
Status Reporting
There aspects status media link, local far-end. each there need know link status connecting ports operation mode. Let's assume interest conversion fiber fiber fiber auto negotiating capability only information available will link status far-end link status. statuses available local converters are: Twisted Pair port status; link status Fiber port status; link fault fault Activity Redundancy switch over redundancy implemented) Redundant link status Duplex mode
AL210 also built-in secondary channel media converter management purposes. secondary channel piggy backed regular transmit packets. very useful reporting far-end status. However, port connected, will cause secondary channel non-functional because fault propagation.
12/99
Reference Only Allayer Confidential
Managed Media Converters Using AL210
Controlling Function
Ideally, management should able control entire media link, local far-end. local control very straightforward easy. Far-end media converters controlled secondary channel. preferable turn media converter other than diagnostic purposes. reason that once media converter turned off, easily turned again. Port enabling disabling (data transmission power down) Controlling redundancy Duplex control Flow control
Management Implementation
functions available AL210/211. addition, AL210/211 secondary channel that support diagnostic remote connecting device.
Dnbit
Control Circuit
Duplex Flow Control Upbit
Control Circuit
Duplex Flow Control
AL210
Fiber
Fiber AL210
Upbit
Status
Dnbit
Status
Status decoder
Status decoder
With configuration shown, local media converter chassis, status converter latched into status decoder. then read status from status decoder. AL210 includes secondary channel that allows communication with remote media converter status. Statuses provided media converters are: link status Fiber link status Redundant link status Fault status Activity (not very useful)
12/99
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Managed Media Converters Using AL210
CONTROL link fault Fiber link fault Redundant channel link status
LOCAL
(available locally secondary channel) (available secondary channel)
control circuit takes command from control media converter's operating modes. Redundancy also controlled using this method. Control function provided media converters are: Power down Link shut down Forced full duplex Forced 802.3X flow control will functional connected device does support 802.3X)
CONTROL Power down Link shut down (data transmission only) Forcing full duplex Forcing 802.3 flow control Turn redundant channel
LOCAL
(available secondary channel), advised Yes. (Available secondary channel). Yes. (Available secondary channel). Yes. (Available secondary channel). Yes, AL210 supports autoredundancy does require this function. (Available secondary channel).
12/99
Reference Only Allayer Confidential
Managed Media Converters Using AL210
Management module
Management modules implemented single embedded with Ethernet Port Allayer switch.
Memory
Power
above implementation advantage simplicity. more advanced management module implemented with Allayer switch such AL102A, AL104 AL216.
Implementing Media Converter with switch
With current pricing switch ICs, economically feasible implement media converters with switching chip. first glance, might argue that latency might long. However, latency issue with collision domain repeater environment. switch segmented collision domain, latency this case relevant. addition, latency incurred switch relatively small when compared with latency cable. Even VOIP video applications, requirement maximum latency milliseconds, therefore latency switch will degrade performance network.
AL102/AL104
Fiber Modules
Memory
Power
12/99
Reference Only Allayer Confidential
Managed Media Converters Using AL210
this system, each media converter configured port based VLAN. eight-port switch, four media converter ports made available. type redundant link, modify VLAN redundancy. management port ports. This management module capability different port different fiber port does require dedicated management port. addition, will also convert Mbit stream Mbit stream. This along with AL210 will provide fullest management capability. design concept expanded 16-port media converter, using only single management module. high port density this probably lowest cost design approach. shortcomings are: This most cost effective multi-port converter module added cost switching hardware. Single port implementations will expensive. There fault propagation. Fault propagation must implemented hardware. will discard error frames (i.e. frames longer than 1536 bytes). management capability, unless AL210 AL211 used fiber front end.
12/99
Reference Only Allayer Confidential

Reference Only Allayer Confidential Managed Media Converters Usin

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