Enterasys mrx Installation Instruction

Page 2-2

•

If a shelving unit is to be used, it must be able to support
30 pounds of static weight.

•

The temperature for the selected location must be maintained
between 5

°

 and 50

°

 C, and less than 10

°

 C per hour temperature

change.

The following network design guidelines must be followed when
connecting the HUB to your network:

•

As a general rule, 130 meters is the maximum length for an
unshielded twisted pair segment.  However, losses introduced by
connections at punch-down blocks and other equipment serve to
reduce this limit.  In most installations, the optimal unshielded
twisted pair length is 100 meters using standard PVC phone wire.

Maximum link length is largely dependent on cable quality.  If
high quality, low attenuation cable is used, link lengths of up to
200 meters are achievable.

•

The device at the other end of the twisted pair segment must
meet IEEE 802.3 10BASE-T specifications.

•

The transceivers that will be connected to the HUB (via a
SPIM-A) must meet IEEE 802.3 standards and must not have the
SQE test function enabled.

When connecting a 10BASE-T Twisted Pair Segment at any of the
10BASE-T Twisted Pair HUB Ports (Ports 1 through 12, a Single Port
10BASE-T Twisted Pair Segment Interface module [SPIM-T or
SPIM-T1]), the following network requirements must be met:

Length - The IEEE 802.3 10BASE-T standard requires that
10BASE-T devices transmit over a 100 meter (328 foot) link using
22-24 AWG unshielded twisted pair wire.