ADTRAN Total Access 3010, Системное руководство, Страница: 161 / 511

Total Access ® 3000/3010 System Manual
6TAAPP336-1E
TOTAL ACCESS 3000/3010
APP-336
Page 3 of 6
© 2002, ADTRAN, Inc.
NOTE
Loop limits are for a circuit with 6 dB nominal margin @ 68
°
F.
If a loop does not meet CSA criteria for HDSL2, it may still conform to general
HDSL2 guidelines. Use
Table 2 and Table 3 to determine if the loop is within HDSL2
guidelines for the following two criteria:
• Maximum dB loss is 35 @ 196 khz and 135 ohms
• Maximum DC ohms per loop is 900
NOTE
The following calculations must be calculated on each individual loop of the
circuit. For example, in a one-repeatered circuit, the calculations must be
performed on the loop between the office and the repeater, and on the loop
between the repeater and the customer.
1.1.4 HDSL2 Loop Limits
In addition to conforming to CSA guidelines, some consideration may need to be
given to inside wiring to properly deploy the system. Some installations may require
drop and customer premises wiring to be included in the network configuration.
HDSL2 loop limits for different gauges of wire are displayed in
Table 1
.
For more detailed information about CSA guidelines, refer to Telcordia
TA-NWT-1210.
Table 1. HDSL2 Loop Limits
e g u a G e l b a C z h K 6 9 1 @ s s o L
t f k / B d t f k / B d
t f k / B d
t f k / B d t f k / B d
t f k r e p s m h O r o f p o o L . x a M
s s o L B d 5 3 s s o L B d 5 3
s s o L B d 5 3
s s o L B d 5 3 s s o L B d 5 3
. x a M @ s m h O
h t g n e L p o o L h t g n e L p o o L
h t g n e L p o o L
h t g n e L p o o L h t g n e L p o o L
6 2 0 8 8 . 3 3 . 3 8 t f k 0 . 9 0 5 7
4 2 1 4 8 . 2 9 . 1 5 t f k 3 . 2 1 8 3 6
2 2 7 7 1 . 2 4 . 2 3 t f k 1 . 6 1 0 2 5
9 1 5 3 5 . 1 1 . 6 1 t f k 8 . 2 2 7 6 3