SAGEM 3P@C

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

2,000

2,500m

3,000

 

m

m

m

 

 

 

 

Maximum

Downs

6,144

6,144

4,928

3,168

2,016

tream

connection rate

 

 

 

 

 

Upstre

 

 

 

 

 

(Kbps)

640

640

640

608

576

am

 

 

 

 

 

 

Line

Downli

18

27

36

43

48

nk

attenuation

 

 

 

 

 

Upstre

 

 

 

 

 

(dB)

12

18

24

30

36

am

 

 

 

 

 

 

Core diameter = 0.32mm

 

 

 

 

 

 

 

 

 

 

 

 

Maximum

Downs

6,144

5,408

4,096

1,920

816

tream

connection rate

 

 

 

 

 

 

 

 

 

 

 

(Kbps)

Uplink

640

640

616

576

528

 

 

 

 

 

 

 

Line

Downli

22

33

42

50

56

nk

attenuation

 

 

 

 

 

Upstre

 

 

 

 

 

(dB)

14

21

28

35

42

am

 

 

 

 

 

 

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.

1.1.1.63Recording 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:

3P@C Installation Manual

Page 12-10 Reproduction and communication in any form prohibited without the written permission of

SAGEM SA