PRACTICE 553-2201-182
Table 1-O
RETURN LOSS (In-Service Requirements)
CONNECTION FROM CIRCUIT
ECHO
LOW/HIGH NOTES
4W VNL TIE TERMINATION RETURN SINGING
TRUNKTOTHE
LOSS
RETURN
FOLLOWING:
_
LOSS
4W VNL Tie Trunk
(through balance) 4W legs of Hybrid
terminated in
600/900R
21
20120
1.3
4W Non-VNL Tie Trunk 600/9OOrr
+
2.16
(terminal balance)
UF
at distant PBX
22
15/U
1.3
2W Non-VNL Tie Trunk
(terminal balance) 600/900R
+
2.16
18
lO/lO 1.5
UF
at distant PBX
CO or FX Trunk (terminal
balance)
PBX Station Line (terminal
balance)
900R
-k
2.16
UF
at
co
60017
+ 2.16
pF
18
lO/lO 2.5
24
18/18 1.4
SL-1 Station Line (terminal
balance) 600R
24
18/18 1.4
PBX Station Line (terminal
Station off-hook
12
818
balance) 1.4
Note 1: Reference impedance is
600/900~
+
2.16
UF.
.-
Note 2: Reference impedance is
900~7
-I-
2.16
,UF.
Note 3: Switchable pads set for nominal loss of 1
dB.
Note 4: Switchable pads set for nominal loss of 3
dB.
Note 5: If facility
loss
is less than 2
dB
or adequate impedance correction is not
provided.
nominal loss has to be increased to 3
dB
by switching in the 2
dB
pad.
Table 1-P
HARMONIC DISTORTION
I+
BANDWIDTH MAX. LEVEL TEST SIGNAL
OF
(Hz)
DISTORTION INPUT LEVEL
PRODUCT
(d8) (dBm)
4
200 to 4600
228
0
.
.
,“.
-
:
,J
Page l-6
.
: