Avaya Engineering Tips & Tricks, vol 1 Uživatelský manuál stáhnout pdf (Strana 7)

interfaces over multimode fiber would be dispersion

limited. OC-3 rate interfaces (either IR or LR) might

be expected to reach 3.2 km over multimode fiber,

and OC-12 IR interfaces might reach 800 meters. It is

important to stress that these are theoretical values.

The circumstances under which these distances can

be achieved is not specified or controlled by Nortel.

The design of the hardware can impact the

applicability of these results and should be

considered. OC-12 LR/ER or OC-48 interfaces use

single-mode fiber in their pigtails, for example, and so

shouldn’t be used with multimode fiber.

Customers using multimode fiber typically want to use

it to transport a small number of low speed interfaces

(e.g. DS-1s). This application would be appropriate

for a number of legacy asynchronous transport

multiplexers, such as the FMT-6 and FMT-150

products that were previously sold by Nortel (since

spun off to CTDI). These products are sold with

ultimode interfaces and support transmission over

multimode fiber. They can act as tributaries to the

OM3000 in a “book ended” fashion if multimode

transmission is a small part of a larger transport

network.

EIM migration consideration for OM33/3400

This document outlines the considerations and

recommendations for customers with previous

deployments of the Ethernet Inverse Multiplexer (EIM)

on the OPTera 3300/3400 platforms. Information is

provided with respect to supported migration paths as

well as the supported hardware for the targeted

software level. Primarily, it is to make one aware of

the change in support status of the EIM circuit card at

releases 9.12 and 11.1 and the options available for a

transition to the OPTera Packet Edge/Resilient Packet

Ring and/or Point To Point circuit cards.

EIM Migration

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Avaya Engineering Tips & Tricks, vol 1 Uživatelský manuál Strana 7