Ericsson MINI-LINK E, Technical Description

Page: 109 / 190

MINI-LINK E and E Micro
3568
MMU
RAU
RAU
MMU
AIS
Near-end Far-end
N2 N1
N3
N4
SMU
(optional)
SMU
(optional)
Figure 68 Near-end loops
Far-end Loops
Far-end looping tests are used in order to find out (from remote) if any of the
units in the far-end terminal is faulty (the SMU, MMU or RAU).
The following far-end loop tests are available (the numbers in brackets after
each loop refer to Figure 69 on page 103):
MMU Rx Loop (F1) In the MMU the traffic signal being received (in the
traffic interface and router part of the unit) is looped
back to the transmitting side.
SMU Rx Loop (F2) In the SMU the traffic signal being received (in the
traffic interface and router part of the unit) is looped
back to the transmitting side.
For details see section Block Diagrams over Loops on Page 104 and block
diagrams of the RAUs in Section 3.3.1 on page 26, Section 3.4.1 on page 31
and Section 3.5.1 on page 36.
3567
MMU
RAU RAU
MMU
AIS
Near-end
Far-end
F2
SMU
(optional)
SMU
(optional)
F1
Figure 69 Far-end loops
103
AE/LZT 110 2012 R8C 2002-03-04