Lantronix LTR8T, Руководство по установке

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LTR-T Installation Guide 19
Hub Interconnection
Ports 8 and 16 (LTR16T) are special in that they can be configured to simplify
interconnection of multiple LTR-Ts. To connect one LTR-T to another LTR-T the
MDI/MDI-X switch on the back of the unit can be used. See "10BASE-T Wiring
Conventions," above, for an explanation of the difference between connector wiring of
hubs and transceivers. Refer to the UTP pinout in Appendix B as you read this.
Each 10BASE-T port on the LTR-T hub is expecting a node at the remote end of the
segment. In anticipation of this, the transmit and receive signal pairs are crossed within
the hub, so that the hub's transmit signal pair becomes the node's receive signal pair and
vice versa. This works fine for hub-to-node connections. If two hubs are interconnected,
however, the signals will be swapped twice, once at each hub's MDI-X interface. One
solution is to use a swapped cable between the two hubs to introduce a third swapping of
the signal pairs. An easier solution is to use port 8 or port 16 (LTR16T) set to MDI on
one hub and connect to any MDI-X port on the second hub. This method requires the
same straight-through type of cable used for hub-to-node connections. (Note: The
interconnection will NOT work if the hubs are connected as MDI-X to MDI-X and a
straight-through cable is used.) See Figures 2b and 5 for example networks.
95-250V
~
50-60Hz 0.5 T2A/250V
This equipment complies with the requirements in Part 15 of FCC Rules for a Class A
and TV reception requiring the operator to take whatever steps necessary to correct th
device. Operation of this equipment in a residential area may cause unacceptable interfe
CAUTION
For continued protection again
risk of fire, replace only w
same type and ratings of fu
Serial #
®
geprüfte
Sicherheit
AUI 1
8 7 6 5 4 3 2 1
LTR 8T
MDI-X
MDI-X
MDI
95-250V
~
50-60Hz 0.5 T2A/250V
This equipment complies with the requirements in Part 15 of FCC Rules for a Class A
and TV reception requiring the operator to take whatever steps necessary to correct th
device. Operation of this equipment in a residential area may cause unacceptable interfe
CAUTION
For continued protection again
risk of fire, replace only w
same type and ratings of fu
Serial #
®
geprüfte Sicherheit
AUI 1
8 7 6 5 4 3 2 1
LTR 8T
MDI-X
MDI-X
MDI
Fi 5 E l f I i 2 LTR T'
LTR-T
AUI
LTR-T
AUI
Ethernet
Backbone
Note that Port 8 MUST
be in "MDI" mode for
interconnecting to work.
Ethernet
Backbone
Figure 5: Example of Interconnecting Two LTR-Ts
Maintenance Information
You do not need to perform any maintenance procedures on your LTR-T. The fuse is the
only user serviceable part, and under normal operating conditions it should not need to be
replaced.