System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Loops
Page 5-12 Proprietary Information Aastra
5.6 Loops
For testing purposes (e.g. troubleshooting), loopbacks can be switched at
the LT/NT and the SHDSL repeaters.
The diagram depicted in the figure below shows the position and direction
of these test loops.
1 LT/NT loop - network side direction
2...9 Repeater x loop - network side direction
10 NT loop - network side direction
11 NT E1 loop
12 Local E1 loop
Figure 5.4: Loopbacks
LT mode
Repeater 1 Repeater 2 Repeater 3 Repeater 8
E1 E1
1234910
SDSL SDSL
12 11
SDSL SDSL
NT mode
SOX