Table 5. Faceplate Leds - ADTRAN Total Reach T400 TRI-C Installation And Maintenance Manual

The recommended TRI-interface deployment
guidelines for Total Reach ISDN are listed in Table 7.
Adherence to these guidelines will allow general
deployment of Total Reach ISDN without further
qualification. If any of the stated guidelines are
exceeded additional circuit testing will be required to
ensure loop loss and noise levels are not exceeded.
CAUTION
Remove load coils from the circuit pairs
being deployed. Loading coils are designed to
pass frequencies in the lower bandwidth
range. Higher bandwidth ranges such as ISDN
will not operate properly if loading coils are
not removed from the pair.
Specific cable loss constant values and DC loop
resistance for various wire gauges are provided in
Table 8. Loop loss constants (in db/kft) are provided
for 20 and 40 kHz and can be used to determine the
Estimated Measured Loss (EML) for any local loop.
Examples of maximum loop lengths are provided for
each wire gauge and are based on 70°F PIC cable with
–44.2 dBm ANSI NEXT. Additional temperature loss
data for different wire gauges and cable material is
shown in Table 9.
These constants were derived using Bell Lab
Transmission System for Communications, 1982, and
the method for determining the insertion loss with 135
ohms driving and termination impedances. The total
length of multi-gauge cable must yield a loop loss less
than or equal to 52 dB @ 20 kHz or 61 dB @ 40 kHz.
For EML, multiply each section's loop length in
kilofeet by the appropriate cable loss constant in
Table 8 to determine the insertion loss of each section.
To determine the insertion loss for each bridged tap in
the feeder, multiply the length of the bridged tap by
1.32 dB (2.09 for 40 kHz). The maximum loss of each
bridged tap is 4.2 dB, (4.7 dB for 40 kHz) regardless
of length. Assume 250 feet for Central Office wiring.
For total insertion loss for the loop, add each section's
insertion loss, the loss due to bridged taps, and loss of
Central Office wiring.
Some Loop Deployment Programs provide automatic
loop insertion loss predictions based on 40 kHz for
ISDN 2B1Q. Table 6 provides a conversion estimate
in dB between insertion loss at 40 kHz for 2B1Q
61212082L1-5C
n I d c i a o t
O F I F C E
T R I I F /
T E S T
A C T
ISDN and the recommended 20 kHz for Total Reach
ISDN. To use, determine the dB loss at 40 kHz using
current methods and the largest component cable size
(24 or 22 AWG). If the 22 and 24 AWG components
are approximately the same, use the values associated
with 22 AWG. This table should only be used to
provide a rough estimate of the insertion loss at 20
kHz. A more accurate estimate can be obtained by
determining the exact cable makeup of a loop and
using the cable loss constants in Table 8.
The U-Interface follows local deployment guidelines
for standard ISDN, as specified in ANSI T1.601 and
shown in Table 10.
Section 61212082L1-5, Issue 3

Table 5. Faceplate LEDs

r C o o l r D e s c i r t p
I F / R d e O N s l o d i
f o s g i a n
y s n h c o r
2 B 1 Q B
F a l h s n i
n i d c i t a s e
E n d B o l
f o r m t e h
n i e t f r c a . e
R d e O N s l o d i
f o s g i a n
y s n h c o r
T R - I R u
o n e c p r e
t e h r c e i e
f o r m t e h
Y l e o l w n I i d a c e t
n i i e h t r e
n t e w r o - k
1 f a l h s
o l o p b c a
e s o c n d f
n a d s l o d i
o l o p b c a
G e r n e O N s l o d i
t r e m n i l a
x e h c n a g
t e h S I D
F a l h s n i
n i i d a c e t
s i e b n i g
t r e m n i l a
o i n
n i d c i t a s e a o l s s
f l o r m r o
n z i t a o i n w i h t t e h
R I n i e t f r c a . e
g o n e c p r e e s o c n d
r c e i e t p f o a N e r a
k c r E o r ( r N E B ) E
2 B 1 Q B R I
n i d c i t a s e a o l s s
f l o r m r o
n z i t a o i n w i h t t e h
n . t i F a l h s n i g
e s o c n d n i d c i t a s e
t p f o a N E B E
T R - I R u n . t i
t s e h T R - I C u n t i s i
a l c o l a r o
o c m m n a d d e e t ; t s
p r e e s o c n d f r o B 1
, k 2 f a l h s s e p r e
r o a B 2 o l o p b c a , k
f r o 2 B + D
. k
n i i d a c e t t s a h t t e h
q e u p i m e t n h s a
d e A C T b s t i w i h t
N s w i c t . h
g o n e c p r e e s o c n d
t s a h t t e h A C T b t i
e s t n o n y l f o r m t e h
q e u p i m n e . t
5