PRACTICE 553-2201-182
Table 2-C
RETURN LOSS (Design Requirements)
CONNECTION
ECHO
RETURN
LOSS
(d8)
SFRL LOSS
id81
(300-3200
Hz)
Line Interfaces:
Line Side (Note
1)
4W Trunk Side (Note 2)
2W Trunk Interfaces:
>18 >12
>21 >19
2W Trunk Side (Note 2)
>22 >14
4W Trunk Side (Note
2)
>21 >19
The design requirements in this table are intended to ensure the
satisfaction of the in-service requirements in Table 2-D.
Note 1:
Terminating impedances
are:
Note 2: Terminating
impedances are:
-
6OOQ
for SL-1 line
. .
-
60012
and 2.16
UF
for PBX.
-
60012
for SL-1 line
-
600 or
900R
and 2.16
pF
for
PBX line.
*.-..
L
.~
_
:;-,
1
:.
. .
..
.I
;
:
Page 2-2
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