Installation manual

Hardware installation2–63
LAN Cabling
The local area network (LAN) used in the Saturn system consists of a 10/100BaseT section, which connects to the Jupiter
file server, and a coax 10Base2 section, also referred to as Ethernet thin cable or “thin net.” LAN cabling guidelines are
shown in Figures 2–45 and 2–46.
Please note the following additional restrictions that apply to the 10Base2 section of the LAN:
S 50–ohm, RG–58 type coaxial cable and BNC connectors must be used for the 10Base2 cabling. 75–ohm
RG–59 cable cannot be used. Furthermore, cable crimpers designed for RG–59 cable may not do a good
job with the smaller RG–58 cable. Factory–made cable is available (see below).
S A 10Base2 LAN cannot be used outdoors between unconnected buildings. An Ethernet thick–cable seg-
ment, connected to thin cable segments with repeaters, would be required for this purpose.
S Local building codes must be checked before LAN installation, especially with regard to grounding re-
quirements and installation of cable in air return plenums. It is recommended that the LAN not be
grounded; but if grounding is required by local code it should be grounded on one end only. Generally, the
national electrical codes restrict the use of LAN cabling in air ducts and plenums. If PVC–jacketed cable is
permitted in such spaces it typically must be run in metal conduit; FEP–jacketed cable is typically permit-
ted without conduit.
S Due to possible speed loss, use of non–Thomson equipment on the LAN is not recommended.
The following 10Base2 cables, with installed BNC connectors, are available from Thomson:
Length Part no.
1 meter (3.3 ft) 01–039805–001
2 meters (6.6 ft) 01–039805–002
4 meters (13.1 ft) 01–039805–004
8 meters (26.2 ft) 01–039805–008
16 meters (52.5 ft) 01–039805–016
32 meters (105 ft) 01–039805–032
The jacket material for these cables is fluoropolymer (FEP).
A termination kit, consisting of a pair of 50–ohm terminators (without ground wire connections) is also available. The
part number is 44–039807–001.