Sagem 3p@c – Sagem 4450E User Manual
Page 167
SAGEM 3P@C
3P@C Installation Manual
Page 12-10
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SAGEM SA
2) Testing and Commissioning of Modem
First, the test can be done by directly connecting the Modem from the junction box of users (If there is no power
supply, the handheld Modem is needed), and by comparing the connection parameters of Modem, we can judge
the normality of backbone cables and the wire-bonding of the distribution frame. Parameters are as follows:
Table 12-7 ADSL service line reference table
Core diameter = 0.4mm
Line length
1,000m
1,500
m
2,000
m
2,500m
3,000
m
Downs
tream
6,144
6,144
4,928
3,168
2,016
Maximum
connection rate
(Kbps)
Upstre
am
640
640
640
608
576
Downli
nk
18
27
36
43
48
Line
attenuation
(dB)
Upstre
am
12
18
24
30
36
Core diameter = 0.32mm
Downs
tream
6,144
5,408
4,096
1,920
816
Maximum
connection rate
(Kbps)
Uplink
640
640
616
576
528
Downli
nk
22
33
42
50
56
Line
attenuation
(dB)
Upstre
am
14
21
28
35
42
The results of actual line measurement may be somewhat different (the line length is known), the attenuation
differs by 3~4db, which should be within the permitted range. If differing too much, the line connector may exist
problems, and need to be checked. And the case of normal attenuation measurement but too low connection
rate may occur, this can be the result of too much line noise. If the upstream rate is low, there may be
interferences of the nearby pairs to the ISDN service; if the downstream rate is low, the poor balance of
peripheral pairs may be the reason, which leads to much noise. If the connection rate of Modem is basically
matched with the reference table, users can commission the ADSL service.
In addition, the correctness of VPI/VCI setting and protocol encapsulation format of Modem is correct.
1.1.1.63
Recording the User Information and Relevant Data
For the convenience of the later operation maintenance, the user information and the data for the initially
commissioned line connection. For details, see Table 12-9 and 12-10: