Nortel Circuit Card, Installation Manual, Page: 179 / 908

NT1R20 Off-Premise Station Analog Line card Page 179 of 906
Circuit Card Description and Installation
Other applications
The operating range and built-in protection provisions of the NT1R20 OPS
analog line card make it suitable for applications which are variants on the
traditional configuration shown in Figure 25 on
page 178 . Examples of such
applications are:
• a PBX in a central building serving stations in other buildings in the
vicinity, such as in an industrial park, often called a campus environment.
Facilities can be provided by the local exchange carrier or can be
privately owned. Protection could be required.
• termination to other than a telephone, such as to a fax machine or a key
telephone system.
• individual circuits on the NT1R20 OPS analog line card can also be
configured as On-Premise Station (ONS) ports in LD 10:
— to have ONS service with hazardous and surge voltage protection
(not available on other analog line cards)
— to use otherwise idle NT1R20 OPS analog line card ports
Transmission considerations
The transmission performance of OPS lines depends on the following factors:
• the port-to-port loss for connections between OPS ports and other ports
• the transmission parameters of the facilities between the OPS port and
the off-premise station or termination
• the electrical and acoustic transmission characteristics of the termination
These factors must be considered when planning applications using the
NT1R20 OPS analog line card. They are important when considering
configurations other than the traditional OPS application as shown in
Figure 25 on
page 178 . The following provides basic transmission planning
guidelines for various OPS applications.