HP invent ProCurve J4908A, Руководство по установке

Страница: 18 / 38

Installing the gl Modules
Module Cable Type Maximum Length
� � � � � � � � � �� �� ��
���������
���������������������
� �� �� ��
�� �����������
������������
����������
�������
��
������
multimode fiber-optic cable
with MT-RJ connector
100-FX port with
MT-RJ connector
� � � � � � � �
100-FX MTRJ gl Module
multimode fiber-optic • full-duplex
cables that are fitted with connections:
MT-RJ connectors.
2 kilometers
•
half-duplex
connections:
412 meters
N o t e
Automatic Cable Sensing on Twisted Pair Ports:
When the ports for the 10/100-TX gl Module and the 100/1000-T gl Module are
in their default configuration,
Auto
, both modules automatically negotiate
whether the ports operate as MDI or MDI-X, depending on the cable type and
the connected device’s operation. As a result, you can use either straight-
through or crossover twisted-pair cable for all network connections to these
modules.
On the 10/100-TX gl Module, this feature is identified as HP Auto-MDIX ; on
the 100/1000-T gl Module, it is identified as Auto MDI/MDI-X and it is part of
the IEEE 802.3ab standard. Both features operate the same.
Operation of this feature depends on the port configurations being kept at
Auto
. If the configuration is changed to one of the available fixed options
though (for example, 100-Full Duplex), the port operates as an MDI-X port. In
that case, to connect the module to another switch or hub, use a crossover
cable; to connect to an end node, use a straight-through cable.
11