Nortel-networks Circuit Card Uživatelský manuál stáhnout pdf (Strana 179)

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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.

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