User's Manual Part 1

12
Failure to use the recommended (or equivalent) standard of cable may invalidate the system’s
safety certification.
The IDU/ODU cable may be unscreened (UTP) or screened (STP). However, unscreened
cables reduce the system’s ability to cope with nearby lightning strikes. If lightning activity is
common in the area of deployment, the use of screened cable is highly recommended. See
Section 9 “Lightning Protection”.
The connection between the IDU and user’s equipment can be made using any standard CAT5
patch cable. The RJ45 Ethernet connection is presented as a piece of network equipment.
However as automatic MDI/MDI-X sensing and pair swapping is employed a crossed or no
crossed Ethernet patch cable can be used for connection to another piece of networking
equipment or directly to end user equipment.
It should be noted that the IDU provides continuity between the screen on the ODU-IDU cable
and screen on the IDU-User equipment cable. If continuity of the screening is desired from the
ODU-IDU to the user’s equipment, CAT 5 STP cable and connectors should be used for the
latter connection. CAT5 STP cable between the IDU and the user’s equipment will provide
additional protection against surges induced on the Ethernet connections.
1.3.5 Surge Arrestor
The IDU does not provide lightning or surge suppression. Should lightning or surge suppression
be required a separate Ethernet surge suppressor should be used and appropriately earthed.
Suitable surge suppressors can be sourced from your Orthogon Systems distributor or reseller.
The ODU is protected by built-in surge suppression as standard.
1.3.6 Mounting Brackets
The OS-Gemini is supplied with a mounting bracket suitable for mounting the ODU to a pole of
50mm to 75mm in diameter or to a flat surface. For more details on mounting, see section 5
“Installation”.
The bracket allows for adjustment in both azimuth and elevation. The bracket may be mounted
to the pole or wall prior to installation. This allows the installer to take the weight of the unit on a
single mounting bolt while fitting the retaining nut and washers.
The IDU can either be desk or wall mounted. The preference is wall mounted with the cables
dressed to a cable channel. Wall mounting is achieved by screwing through the mounting
lugs
on either side of the unit. Remember to leave space for access to the reset button. See section
5.7.7.