SELECT A LOOP
-1
NOTES
0.01 The requirements for a Meridian Digital Telephone are that the loop be
without bridge taps, and be less than 175 Ohm dc resistance. and less than 12.0
dB
loss at 256
kHz.
For a single gauge cable, the-length limits are 3000 ft for 22 and
24 AWG cable and D inside wiring, and 2100 ft for 26 AWG cable.
0.02 The allowable loop length assumes that there is no under-carpet cable. If
there is under-carpet cable of a type that is different from Western Electric
4-pair cable, reduce the allowable loop length using the following equation:
. LM
=
I12
-(UC
x
UL)
1
/LL
where
LM
=
loop length limit in km
(kftl
(excluding the length of the under-carpet
cable).
LL
=
loop loss in
dB/km
(dB/Kftl
at 256
kHz.
UC
=
length of the under-carpet cable in km
(kft).
. .
UL
=
loss of the under-carpet cable in
dB/km
(dB/kftl
at 256
kHz.
Refer to
Table 1006-B for
dB-values.