\ \
When a loop start trunk is connected to a circuit, its When a loop start trunk is connected to a circuit, its
: : associated switch must be set to the
LP
position. If a associated switch must be set to the
LP
position. If a
ground start trunk is connected, the switch must be set ground start trunk is connected, the switch must be set
to the
GD
position.
\
OLEDlOl I?
c
OLED201
OLED301
OLED401
OLED 1
ON $ ‘00”’ ;jirp ,‘DE?p y;, y,
OFF
E
1
Figure 200-20 COT-E ( ) Switch Layout
LED1 (Green) lit, indicates that the COI-E is receiving B
power.
r LEDs 101-401 (Red) indicate the status of the fou
associated circuits. Each LED ON indicates it
associated circuit is in use.
A maximum of ten COI-E ETUs can be installed in ;
system, into any interface slots.
B. COI-EB ETU
This Central Office Interface ETU provides the same
services as the COI-E ETU, in addition it supports the
CENTREX ringing feature. (CPU-EB3 or highe
revision level ETU is also required.)
f C. TLI-E ETU
The TLI-E ETU provides circuitry for servicing up to
two dial pulse lines; DID, Loop Dial, 2 or 4 wire E&M
Tie lines. It contains ten switches and three LEDs.
Switches designated SW101 and SW201 are used to
select the type of E&M Tie lines (2 or 4 wire).
NOTE:
When Loop Dial /DID lines are connected,
these switches must be set to the 2 wire
position.
Switches designated SW102 and SW202 are used to
select the type of lines (DID /Loop Dial or E&M).
Switches designated SW103 and SW203 are used to
select the type of E&M signaling (type I or V) for
E&M Tie lines being used.
ND-20292
CHAPTER 2
APRIL, 1990
Switches designated SW301, SW302, SW401 and
SW402 are four position dip switches used to select loss
level for loop dial, DID, 2 and 4 wire E&M Tie lines.
Loss levels can be adjusted for 0, 2, 4, 8, 12 or 16 db.
(See Figure 200-21).
SW301 sets the transmission loss level for Channel 1.
SW302 sets the reception loss level for Channel 1.
SW401 sets the transmission loss level for Channel 2.
SW402 sets the reception loss level for Channel 2.
1
mON
All switches OFF = Odb
2
m ON
Switch 1 ON = -2db
Switch 2 ON= -4db
3
mON
Switch 3 ON = -8db
4 =
ON
Switch 4 ON = -12db
All switches ON = -16db
Figur: 200-21 SW3<1, SW302 SW401 or SW402 pad
switch settings bn TLI-E ETU
LEDs 1 and 2 (Red) indicate the status of the
associated two circuits.
Each LED ON indicates its associated circuit is in use.
LED 3 (Green) lit, indicates the TLI-E ETU is
receiving power.
A maximum of twenty TLI-E ETUs can be installed in
a system, into any interface slots.
D. TLI-EB ETU
The TLI-EB ETU provides circuitry for servicing up to
two lines; 2 or 4 wire, Dial Pulse or DTMF, E&M Tie
lines. It contains six switches and three LEDs.
Switches designated SW101 and SW201 are used to
select the type of E&M Tie lines (2 or 4 wire).
NOTE:
Loop Dial/DID lines can not be connected to
this type ETU.Switches designated SW102
and SW202 are eight position dip switches
used to select loss level for the 2 and 4 wire
E&M Tie lines. Loss levels can be adjusted
for 0, 2, 4, 8, 12, or 16 db. (See Figure
200-22).
Switches designated SW103 and SW203 are used to
select the type of E&M signaling (type I or V) for
E&M Tie lines being used.
SW102 (Switches l-4) sets the transmission loss level
for Channel 1.
200 - 25