Network Components; Configuration Devices Used For 100Base-Tx/10Base-T Connection - Mitsubishi Electric QJ71E71-100 User Manual

5.2

Network Components

This section describes the devices used for Ethernet.
5.2.1
Configuration devices used for 100BASE-TX/10BASE-T
connection
A QJ71E71-100 is used for 100BASE-TX and 10BASE-T connections. An E71 determines whether to use 10BASE-T
or 100BASE-TX and the full-duplex or half-duplex transmission mode according to the hub. For connection to the hub
without the automatic negotiation function, set the half-duplex mode on the hub side.
(1) 100BASE-TX connection
To configure a system for 100BASE-TX connection, use devices that meet the IEEE 802.3 100 BASE-TX
standards.
Configuration device
Shielded twisted pair
cable (STP)
Connector
Hub
*1 This applies when a repeater hub is used. For the number of levels that can be constructed when a switching hub is
used, consult with the manufacturer of the switching hub used.
(a) Precautions for using a hub
The QJ71E71-100 does not support the flow control of the IEEE802.3x.
Therefore, for the connection using an IEEE802.3x-compatible hub, the data sent from the QJ71E71-100 may
be lost and the execution of the dedicated instruction may be timed out if the Ethernet line is heavily loaded.
If the phenomenon mentioned above occurs, reduce the load on the line taking mesures such as adding hubs.
E71
Straight cable A Category 5 or higher straight cable is usable.
System operation using connection with a cross cable is not
guaranteed. Note, however, that a Category 5 or 5e cross cable can be
Cross cable
used for data communications with an E71 (between QJ71E71-100
modules) or connection with a GOT.
RJ45 connector
100Mbps hub
Up to two levels of cascade connection can be configured.
CHAPTER 5 SYSTEM CONFIGURATION
Connected device
Hub
Description
-
5
*1
71