Product Description

Table Of Contents

Product Description

36 (98) © Nokia Corporation Draft DN991444

Nokia Proprietary and Confidential Issue 3-0 en Draft

Note

4.2 Transmission with the Nokia MetroSite EDGE Base

Station

This section describes the transmission topologies that can be built by using the

transmission unit capacity of the Nokia MetroSite EDGE Base Station. The

transmission node that expands the transmission capacity is typically the Nokia

MetroHub Transmission Node. For more information on the larger

configurations, refer to Nokia MetroHub Transmission Node documentation.

The transmission unit takes care of the transmission between the Nokia MetroSite

EDGE Base Station and the BSC through the Abis interface. The transmission

media can be either radio link (RRI) or wireline (E1/T1).

The FC RRI and FXC RRI transmission units are used with Nokia MetroHopper

radios and/or Nokia FlexiHopper microwave radios. The FC E1/T1, FXC E1 and

FXC E1/T1 transmission units are used for wireline transmission.

When EDGE transmission is being used, the FC type transmission units are not

recommended because of the high data transfer rates that are possible with

EDGE.

The FXC RRI, FXC E1 and FXC E1/T1 transmission units have a cross-connect

capability. The bidirectional connection between two interface ports (B2 cross-

connection) can be made with 2M, nx64k, 64k, 32k, 16k and 8k granularities.

Granularity refers to the number of bits connected into a specific direction in the

cross-connection.

The FC RRI and FC E1/T1 transmission units are used in the termination points

of the transmission chain. More information on transmission unit alternatives can

be found in Chapter 6.

Examples of transmission topologies built with different transmission units are

presented in Figure 10. Depending on the type of transmission unit, it is possible

to use the following network topologies:

• Chain connection (A and B in Figure 10)

• Star connection (C and D in Figure 10; with the radio transmission

alternative, the centre point of the star is always a transmission node)

• Loop connection (E and F in Figure 10)