
3465&3485-mfc.ib.rev4.doc
page 9 of 22
17/10/2007
Installation
Operational Safety:
WARNING
Operation of electronic equipment involves the use of voltages and currents that
may be dangerous to human life. Note that under certain conditions dangerous
potentials may exist in some circuits when power controls are in the
OFF
position.
Maintenance personnel should observe all safety regulations.
Do not make any adjustments inside equipment with power
ON
unless proper
precautions are observed. All internal adjustments should only be made by suitably
qualified personnel. All operational adjustments are available externally without the
need for removing covers or use of extender cards.
Pre-Installation:
Handling:
This equipment may contain or be connected to static sensitive devices and proper static free handling precautions
should be observed.
Where individual circuit cards are stored, they should be placed in antistatic bags and proper antistatic procedures
should be followed when inserting or removing cards from these bags.
Power:
AC mains supply:
Ensure that operating voltage of unit and local supply voltage match and that correct
rating fuse is installed for local supply.
Earthing:
Particular care should be taken to ensure that the frame is connected to earth for safety reasons.
Signal earth: For safety reasons a connection is made between signal earth and chassis earth. No attempt should be
made to break this connection.
Installation in frame or chassis:
See details in separate manual for selected frame type.
Connections:
Signal connections:
MFC-3485
ASI input:
This BNC input is terminated in 75 Ohms. Input cable compensation is automatic for up to 300 metres of high
quality 75 Ohm coaxial cable (Belden 8281 equivalent). No adjustments are required.
G.703 output:
This BNC output has a 75 Ohms characteristic output impedance. Cable must be terminated in 75 Ohms at the
connected load.
Link setting, LK1, sets unit for either HDB3 or B3ZS output.
LK1
IN
HDB3 output, MFC-3485/34 (34 Mb/s) version.
OUT B3ZS output, MFC-3485/45 (45 Mb/s) version.
Note: LK1 does not change unit from 34 Mb/s operation to 45 Mb/s operation or vice-versa.
For the MFC-3485/45 a choice of shaped or unshaped output is available. This is set by link LK2 and should be set
to correspond to the length of cable connected to the output. This is necessary only if a shaped characteristic is