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3. CONNECTIONS
The 2FXS/DPO PM occupies one card position in the D4
channel bank. The connector pin assignments are
detailed in Figure 3.
4. TESTING
The 2FXS/DPO performs
a self test after power on.
During this time all four
indicators turn On in a
predefined sequence
while the
2FXS/DPO
verifies proper operation
of critical circuits in the
design. After successful
completion of the self test,
all indicators function in
their normal mode.
Digital Loopback Test
The Digital Loopback Test
is used to test loopback
data coming from the
network. Received data,
or RNPCM, is latched in
during the appropriate
receive time slot. This
data is then placed on the
TDATA bus during 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.
Customer Ringing Test
The Customer Ringing Test will activate the unit's ring
relay in a 2-on/4-off ring cadence, providing ringing to
the customer loop when a ring generator is properly
connected to the channel bank.
1004 Hz DRS Tone Generation Test
The 1004 Hz DRS (Digital Reference Signal) Tone
Generation test is used to send the DRS signal to the
network, loop, or both. When Network is selected, the
DRS is sent to the network from the unit. The far end unit
should measure a 1004 Hz tone at a level determined by
the circuit gain of the far end unit. When Loop is
selected, the DRS is placed on the receive path. The
loop receive level is determined by the following equation:
Receive Level = 0dB - Attenuation
4
FRM GND
28
1
-12V
29
2
+5V
12V GND
30
3
+12V
31
4
5V GND
32
5
TWD
33
6
TSP
34
7
TDATA
TSQ
35
8
RNPCM
36
9
RFB
RFA
37
10
RCLK
TDCLK
38
11
RWD
39
12
RSQ
RSP
40
13
RNDIS
41
14
-48 FRT
42
15
-48F
43
16
-48 SPRT
44
17
45
18
46
19
47
20
TFCC
48
21
IN
49
22
-48SD
2N
50
23
R
T
51
24
52
25
BT
RT
53
26
20HZ
RG
54
27
Figure 3. Connector
Pin Assignments
Section 61109403L2-5, Issue 3
When the option BOTH is selected, tone is placed on
both the loop and the network.
Accessing Tests Through EASYMENU
Once the unit is in normal operation, these test features
are accessed by selecting:
Channel Unit Menus
Desired slot
Test
These tests are service affecting.
Faceplate Indicators
The 2FXS/DPO faceplate indicators and descriptions
are explained in Table F.
Table E. 2FXS/DPO Faceplate Indicators
Indicator
Indication
2FXS/DPO
1109403L2
REM
Off
PM
Green
Flashing
AP
REM
PM
Off
PM
Green
TEST
BUSY
Off
TEST
Yellow
BUSY
Off
Green
Switch
Selection
AP
Depressed
The 2FXS/DPO PM has four faceplate indicators and a
depressed provisioning switch. The front panel PM
(Performance Monitoring) indicator Flashes during
control link establishment and remains ON after the
channel unit has been remotely provisioned.
If the channel unit has been remotely provisioned, the
operator can alternate between the remote configuration
data stored in nonvolatile memory or manual switch
settings by pressing the momentary AP (Alternate
Provisioning) switch located on the front panel.
The REM indicator remains ON when the channel unit is
operating based on Remote Provisioning, and is OFF
when based on manual switches. If the channel unit has
never been remotely provisioned, the AP switch has no
effect and the REM indicator remains OFF . The REM
LED Flashes when an invalid operation mode is selected.
(3)
(1-24)
(4)
Description
Unit is manually provisioned.
Unit is remotely provisioned.
Configuration/provisioning error.
PM mode is not operating.
PM mode is operating.
All tests are inactive.
Test is active.
Network and Loop On-hook.
Network, Loop, or both are Off-
hook.
Description
Alternate provisioning switch.
Changes provisioning source
from manual to remote or remote
to manual.
61109.403L2-5C
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