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PA-2JT2 6.3-MHz Serial Port Adapter Installation and Configuration
OL-3587-01
JT2 Port Adapter Installation Prerequisites
The 75-ohm coaxial BNC connections must conform to JIS C5412-1976 high-frequency coaxial
C02-type connectors, which are equivalent to MIL C 3608 BNC connectors and coaxial cables. (For
specific cable requirements, refer to the section “
JT2 Port Adapter Interface Connectors and Cables
on page 10.)
Further, the 75-ohm coaxial cables must have ferrite sleeves around them to reduce the effects of
electromagnetic interference (EMI). Four ferrite sleeves are included with your JT2 port adapter
have the following specifications: 275 ohms @ 100 MHz.
•
A B-type or C-type data service unit (DSU) with a 75-ohm, coaxial BNC input and an optical fiber
output, to which you attach the 75-ohm coaxial cables from the receive (RX) and transmit (TX) ports
on the JT2 port adapter. (Older A-type DSUs are not supported with PA-2JT2.)
Your DSU
must
be capable of, and set to accept, external grounding because the JT2 port adapter’s
TX and RX connections are grounded at the router-chassis side.
•
Number 1 Phillips and a 3/16-inch, flat-blade screwdriver.
•
Your own ESD-prevention equipment or the disposable grounding wrist strap included with all
upgrade kits, FRUs, and spares.
FCC Class B Compliance
The equipment described in this publication generates and might radiate radio-frequency energy. If it is
not installed in accordance with Cisco’s installation instructions, it might cause interference with radio
and television reception. This equipment has been tested and found to comply with the limits for a Class
B digital device in accordance with the specifications in part 15 of the FCC rules. These specifications
are designed to provide reasonable protection against such interference in a residential installation.
However, there is no guarantee that interference will not occur in a particular installation.
You can determine whether your equipment is causing interference by turning it off. If the interference
stops, it was probably caused by the Cisco equipment or one of its peripheral devices. If the equipment
causes interference to radio or television reception, try to correct the interference by using one or more
of the following measures:
•
Turn the television or radio antenna until the interference stops.
•
Move the equipment to one side or the other of the television or radio.
•
Move the equipment farther away from the television or radio.
•
Plug the equipment into an outlet that is on a different circuit from the television or radio. (That is,
make certain the equipment and the television or radio are on circuits controlled by different circuit
breakers or fuses.)
•
Modifications to this product not authorized by Cisco Systems, Inc. could void the FCC approval
and negate your authority to operate the product.
Safety Guidelines
This section provides safety guidelines you should follow when working with any equipment that
connects to electrical power or telephone wiring.
