TIA-785:2001 (R2014)

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100 Mb/s Physical Layer Medium Dependent Sublayer and 1-Mb/s Auto-Negotiation on 850nm Fiber Optics

Published By	Publication Date	Number of Pages
TIA	2001	48

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Category: TIA

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Description

This Standard specifies the 100BASE-X PMD (including MDI) and
fiber optic medium for a short wavelength, multimode fiber,
100BASE-SX. In order to form a complete 100BASE-SX Physical Layer
it shall be integrated with the 100BASE-X PCS and PMA in accordance
with clause 24 of IEEE Std. 802.3-1998, which is assumed
incorporated by reference. As such, the 100BASE-SX PMD shall comply
with the PMD service interface according to clause 24.4.1 of IEEE
Std. 802.3- 1998.

This Standard also specifies the Media Conversion Sublayer,
which extends the Auto-Negotiation function defined in IEEE Std.
802.3-1998 to fiber optic media. With the introduction of the Media
Conversion Sublayer, devices sharing a fiber optic link segment can
configure automatically to take advantage of their full
capabilities. By exchanging information during an initialization
phase, the link partners determine the operational capabilities of
each other, and choose one based on a priority resolution function
defined in this Standard. The supported management capabilities
allow enabling and disabling the Auto-Negotiation function. It also
forces a specific operational data rate and duplex mode. The Media
Conversion Sublayer extends the Parallel Detection function to the
fiber optic environment. The Parallel Detection function allows for
the recognition of 10BASE-FL and 100BASE-SX compatible devices,
even when those devices do not include the Auto-Negotiation
function. This Standard is intended for LED based systems only.

Purpose

The purpose and intent of this Standard is to provide a clear,
simple, and inexpensive upgrade path from 10 Mb/s fiber optic
Ethernet compatible applications to 100 Mb/s Fast Ethernet
compatible applications using short wavelength (850 nm). This
Standard outlines a method for translating between twisted pair
media dependent signaling and fiber optic media dependent signaling
for 10 Mb/s, 100 Mb/s, and Auto-Negotiation. The PMD
characteristics are outlined in clause 4 of this Standard, with
other references listed in clause 2, and the functional
characteristics are outlined in clause 5 of this Standard.