Nortel Networks Circuit Card User Manual

 NT1R20 Off-Premise Station Analog Line card

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 

. 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

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 

. The following provides basic transmission planning 

guidelines for various OPS applications.