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Connections
TA 750/850
A single 50-pin male amphenol connector on the rear
of the TA 750/850 chassis provides the interconnect
wiring for the four analog circuits on each access
module. Figure 4 details the pinout of the connector.
TA 1500
Four 50-pin male amphenol connectors on the rear of
the TA 1500 chassis provide the interconnect wiring
for the four analog circuits on each access module.
5. TESTING
A self test is performed on the FXO when inserted
into an active TA 750/TA 850 or TA 1500 chassis.
The test verifies proper operation of FXO circuitry. If
the test is successful all four LEDs turn On in a
predefined sequence, the unit is placed in service, and
the LEDs then return to normal operation showing
current status of the FXO.
Initiated Tests
Tests conducted on the Quad FXO are initiated via the
screen menus and VT 100 terminal.
DIGITAL LOOPBACK TEST
The Digital Loopback Test is used to loopback DS0
data coming from the network for each individual
channel. Received data is latched in on the appropriate
receive time slot on the receive bus. This data is then
placed on the transmit bus in the unit's transmit time
slot.
NETWORK ON-HOOK / OFF-HOOK TEST
The Network On-hook / Off-hook test is used to test
signaling sent to the network by the unit. When
On-hook Test is selected, On-hook signaling is sent to
the network. When Off-hook Test is selected,
Off-hook signaling is sent to the Network. The
customer loop is forced On-hook while this test is
active.
1000 H
DRS TONE GENERATION TEST
Z
The 1000 Hz DRS (Digital Reference Signal) Tone
Generation Test is used to send DRS signal on the
receive path to the loop. The loop receive level is
determined by the following equation:
Receive Level = 0 dB - Attenuation
4
Figure 4. Connector Pin Assignments
Section 61175407L1-5, Issue 2
25
50
P
24
49
P
23
48
Slot 6
P
22
47
P
21
46
P
20
45
P
19
44
Slot5
P
18
43
P
17
42
P
16
41
P
15
40
Slot 4
P
14
39
P
13
38
P
12
37
P
11
36
Slot 3
P
10
35
P
9
34
P
8
33
P
7
32
Slot 2
P
6
31
P
5
30
P
4
29
P
3
28
Slot 1
P
2
27
P
1
26
50 PIN
AMP
RECEPTACLE
NC
R
Circuit 4
T
R
Circuit 3
T
R
Circuit 2
T
R
Circuit 1
T
R
Circuit 4
T
R
Circuit 3
T
R
Circuit 2
T
R
Circuit 1
T
R
Circuit 4
T
R
Circuit 3
T
R
Circuit 2
T
R
Circuit 1
T
R
Circuit 4
T
R
Circuit 3
T
R
Circuit 2
T
R
Circuit 1
T
R
Circuit 4
T
R
Circuit 3
T
R
Circuit 2
T
R
Circuit 1
T
R
Circuit 4
T
R
Circuit 3
T
R
Circuit 2
T
R
Circuit 1
T
61175407L1-5B
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