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Operating Specifications
Page 2-8
On STH models -42/-44, each RJ45 connector is encased in a metallic
shield which provides a means of connection for the STP cable shield.
Shield continuity is maintained by contacts within the female RJ45 that
contact the metallic casing of the male RJ45 on the STP lobe cabling.
Shielded patch cables that adapt a shielded RJ45 to a Media Interface
Connector (MIC) are available from Cabletron Systems in eight-foot
lengths. These adapter/patch cables permit connection to an existing
patch panel equipped with MICs.
2.6 Operating Specifications
Cabletron Systems reserves the right to change these specifications at any
time without notice.
2.6.1 Ring Speed
The operating ring speed for the STH hub may be set via the Ring Speed
Switch on the front face of the STH or by MIB commands from an
intelligent hub.
If the STH hub has had no connection to any intelligent hub since power-
up, the Ring Speed switch effects immediate changes in the hub’s ring
speed. Under normal conditions, however (when the STH is being
managed by an intelligent hub), the STH hub’s Ring Speed switch setting
is read only at power-up. In order to change the STH hub’s ring speed via
the Ring Speed switch, the user must change the switch setting and
power-cycle the STH (unplug its power cord and plug it in again).
MIB commands from intelligent hubs override the Ring Speed switch
setting. Once the switch setting has been overridden, the MIB command
ring speed setting will remain in effect at all subsequent power-ups as
long as the switch setting on the STH is not changed. MIB commands are
accessible through the MIB Navigator screen on the intelligent hub’s
Local Management application and through other SNMP network
management software packages including Cabletron Systems’ Remote
LANVIEW
®
/ Windows.
The user may cancel the MIB override and regain switch control over the
STH hub’s ring speed by changing the current switch position and
power-cycling the STH.