Issue 2.0
April 2000
1-5
365-353-255
DACS II Operation and Maintenance Manual
Release 8.2.6 Features
Remote Loopback Feature (Continued)
Remote Loopback
Process
The following process, illustrated in Figure 1-1, is used to set up the Remote
Loopback test:
1.
The local multiplexer activates the Remote Loopback signal.
2.
The remote multiplexer detects the loopback signal.
3.
The remote multiplexer activates the loopback.
4.
A test signal is sent through the local multiplexer and over the specified
DS1/E1 tributary. This signal will be sent back towards the local multiplexer.
5.
The looped back test signal is received by the local multiplexer and a
comparison is made between the sent and received signals to determine
the condition of each multiplexer and facility between them.
Figure 1-1.
Remote Loopback Process
M U X
D E M U X
M U X
D E M U X
D o w n strea m
U p strea m
D S 3 F acility
E -1 or D S 1
D S X
1 A ctiv ate L o op b a ck S ig n a l
2 D etect L o op b a ck S ig n a l
3 A ctiva te L oo p b ack
4 S en d T est S ign a l
M U X = M u ltip lex er
D E M U X = D em u ltip lexer
K C R 8 H M X R
R em ote M u ltip lex er
D S X = D S 1 o r E -1 trib u ta ry of H yb rid D S 3 sig n a l
5 R eceive T est S ig n a l
//
IF T U
N P C
L oca l M u ltip lexer (D A C S II)
.
.
E -1
or
D S 1
.
D S X
//
.
A IS
