TC8000 4 to 8CH Audio/Intercom
User's Manual
Rev. 7.0
MNL-80000-01-70
- 15 -
Chapter 2 - Installation
Unpacking the Unit
Before unpacking any equipment, inspect all shipping containers for evidence of external damage
caused during transportation. The equipment should also be inspected for damage after it is
removed from the container(s). Claims concerning shipping damage should be made directly to
the pertinent shipping agencies. Any discrepancies should be reported immediately to the TC
Communications Inc. Customer Service Department.
Equipment Location
The TC8000 should be located in an area that provides adequate lighting and working space.
Avoid locating it next to any equipment that may produce electrical interference or strong mag-
netic fields, such as elevator shafts, heavy duty power supplies, etc.
System Configuration
(see DIP switch settings on pages 7 and 8)
All the channels are factory configured as either ANALOG, INTERCOM or DATA. RJ11F
Sockets are provided to connect the Analog, Intercom or data signals on the rear panel.
Power Supplies
Each TC8000 card is powered by an external DC power adapter rated 12VDC @500mA(24VDC
or -48VDC are optional). Observe the labeled polarities. Only one power source is needed to
power the unit.
Either a power adapter or TC's power card can be utilized to supply the power.
The terminal block connector for power can be plugged into any power jack (either A or B) on the
rear panel. Please refer to the rear panel page (page 6) for locations. Since each TC8000 is
equipped with power redundancy capability, the power LEDs on the front panel will be "ON" to
indicate related power input.
Fiber Optic Cable Types
Conventionally, fiber optic cable with yellow-colored insulation is used for single mode applica-
tions; gray or orange-colored insulated cable is for multimode use. If multimode cable is used in a
single mode application, the test results could be erroneous and confusing.
Calculating the Loss on the Fiber
The fiber optic link and/or the connectors are frequently the source of communication problems.
If problems are present, check the optic connectors and the integrity of the link first. Ideally, the
link should be calibrated for total loss after the installation has been completed. This will accom-
plish two things: (1) it will verify that the total loss of the link is within the loss budget of the device
and (2) it will provide a benchmark for future testing. For example, a system that has been tested
as having 6dB of signal loss when installed should not suddenly test out as having a loss of 10dB.
If this were the case, however, the fiber link or connector would probably be the source of the
problem.
These are the reference values we use to calculate the loss on the fiber:
Multimode 850nm
:
3 dB loss per km on 62.5/125µm cable*
Multimode 1310nm
:
2 dB loss per km on 62.5/125µm cable*
Single Mode 1310nm
:
0.5 dB loss per km on 9/125µm cable*
Single Mode 1550nm
:
0.25 dB loss per km on 9/125µm cable*
*These numbers are listed for reference only. We recommend an OTDR reading be used to measure actual link loss.
