10/100Base-X And 1000Base-Tx Reach; 10/100Base-Tx Autonegotiation Recommendations - Avaya 8800 Planning And Engineering

Hardware fundamentals and guidelines
If no PMD compensating devices are available and the proposed fiber is over the PMD limit,
use a different optical fiber.

10/100BASE-X and 1000BASE-TX reach

The following tables list maximum transmission distances for 10/100BASE-X and 1000BASE-
TX Ethernet cables.
Table 10: 10/100BASE-X and 1000BASE-TX maximum cable distances
IEEE standard
Date rate
Multimode fiber
distance
Cat 5 UTP distance
STP/Coaxial cable
distance

10/100BASE-TX Autonegotiation recommendations

Autonegotiation lets devices share a link and automatically configures both devices so that
they take maximum advantage of their abilities. Autonegotiation uses a modified 10BASE-T
link integrity test pulse sequence to determine device ability.
The autonegotiation function allows the devices to switch between the various operational
modes in an ordered fashion and allows management to select a specific operational mode.
The autonegotiation function also provides a Parallel Detection (also called autosensing)
function to allow 10BASE-T, 100BASE-TX, and 100BASE-T4 compatible devices to be
recognized, even if they do not support autonegotiation. In this case, only the link speed is
sensed; not the duplex mode. Avaya recommends the autonegotiation settings as shown in
the following table, where A and B are two Ethernet devices.
34 Planning and Engineering — Network Design
10BASE-T 100BASE-TX
802.3 Clause 802.3 Clause
14 21
10 Mbit/s 100 Mbit/s
N/A N/A
100 m 100 m
500 m 100 m
100BASE-FX 1000BASE-TX
802.3 Clause 802.3 Clause
26 40
100 Mbit/s 1000 Mbit/s
412 m (half- N/A
duplex) 2 km
(full-duplex)
N/A 100 Ω, 4 pair:
100 m
N/A
November 2010