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Back to back links – Framed E1

4.3.

Figure 12 : Back to back framed E1 network diagram

The above network uses a repeater site to pass the radio traffic between two sites. The radio at the local

site is set to internal and will generate the clocking for the entire network. The radios set to "Link" will

derive their clocking from the corresponding radio. At the repeater site the radios are interlinked via

framed E1. Because clocking information is not passed over a framed E1 the second radio link needs to

clock from the first radio link, in order to maintain synchronisation across the network. The radio at the

repeater site is set to External and is clocked of the incoming Framed E1 circuit.

4.4.

Figure 13 : Drop and insert 4 wire network diagram

The above network uses a repeater site to pass a 4 wire circuit between sites. This would be a typical

setup for 2 way radio site interlink, where keying of all sites at once is required. To facilitate the drop and

insert of the 4 wire circuits an external audio bridge is used.

As the traffic being transported is not digital, paired radios can be set to internal and link.

Aprisa XE Clocking Technical Paper

11 | 15

Issued by: 4RF Customer Services 15 January 2009