Ericsson MINI-LINK TN R3 ETSI, Technical Description, Page: 56 / 150

MINI-LINK TN R3 ETSI
3.9.4 Equipment and Line Protection
9719
AMM 2p B
AMM 2p B
MMU2 E 155
MMU2 E 155
MMU2 E 155
MMU2 E 155
ADM ADM
Figure 48 High capacity hop protected with ELP
The Equipment and Line Protection (ELP) functionality is able to simultaneously
protect the STM-1 line interface and the radio equipment against any single
point of failure (e.g. the single MMU). This is commonly used to protect a high
capacity hop.
On the radio side, it uses a single frequency (hot standby configuration). In this
mode the radio section performs protection switching on the transmitter side.
The ADMs at both ends carry out the line protection.
A full MINI-LINK high capacity equipment protection can also be achieved
by using only one optical interface on the ADM (without the MSP protection
in the ADM).
In ELP configuration, in order to save radio bandwidth, only one of the two
multiplex sections of the MSP (working/protection) is sent over the air. For this
reason some limitations apply to the data contained in the MSOH, which (if
used) must be bridged on both channels.
The ADM shall be configured with MSP in unidirectional mode.
With DCCm configured as protected, it is not possible to use two different DCC
connections on working and protection section, but the same traffic shall be
bridged on both sides.
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4/1555-CSH 109 32/1-V1 Uen B 2007-09-14