Section 311-610-20B
030-101522 Rev. C
11
0509IBRC
Figure 10. 3116-10 Front Panel
B90-311610
125641
NIU-PM
PWR
ESF
FAC
CPE
LB
C
P
E
B
R
G
TP1
TP2
MAN
LB
B8ZS
F
A
C
B
R
G
CAUTION
When disconnecting test equipment from the bantam jacks or the Craft Interface port,
apply pressure on the unit front panel to hold the unit in the assembly. Failure to do so
may cause the unit to be removed from service while disconnecting test equipment.
Pin 3 - RxD (Receive Data-IN)
Pin 2 - TxD (Transmit Data-OUT)
Figure 11. Front Panel RS-232 (DB-9) Pin Assignments
Pin 5 - SGN (Signal Ground)
7.1.2
RS-232 DB-9 Connector
The 3116-10 contains a front panel, 9-pin, female, RS-232 DB-9
hardware connector which allows access to stored performance
data for retrieval purposes, and allows maintenance, circuit
troubleshooting and set up procedures.
7.1.3
Push Button Switch, MAN LB
The NIU loopback state can be controlled by pressing the front-
panel MAN LB push button. Depression of the MAN LB push
button will cycle through the loopback states.
When first depressed, the LB LED will go off and remain
off during the first 3 seconds that the MAN LB is depressed.
If released during this 3 second period, all existing loopback
conditions will be deactivated.
If depressed for 3 to 5 seconds, the LB LED will be on solid
(yellow). If released in this interval, the Network Loopback
will be activated.
If depressed for greater than 5 seconds, the LB LED will be-
gin flashing (yellow). If released after 5 seconds, the Dual
Loopback will be activated.
7.1.4
Test Points
The 3116-10 contains two test point jacks for measuring the span
current.
TP1 & TP2
Allows for measuring span current using a DC
voltmeter. TP1 will read positive with respect to
TP2. A voltmeter reading of 0.6VDC equates to
a 60mA span.
7.1.5
Status LEDs
The multi-function status LEDs on the front panel provide a
visual indication of various maintenance and alarm conditions.
The LED colors, states, and conditions are listed in Table 4.
LED‘
LED
Color
LED
State
STATUS LED Description
PWR
Green
On
Power is applied and present to the unit.
Off
Power not applied.
LB
Y ll
On
Unit is in Loopback.
Yellow
Flashing
Unit is armed and ready to detect the addressable
LB code.
Blinking*
Unit is in dual loopback.
Off
Unit is not in any loopback condition.
FAC
Green
On
Signal is detected from the network.
Red
On
Signal from the network to the unit is lost.
CPE
Green
On
Signal is detected from the customer.
Red
On
Signal from the customer is lost.
ESF
Green
On
Unit has detected ESF framing from the network.
Off
Unit is detecting SF/unframed signals from the
network.
B8ZS
Green
On
Unit is configured for B8ZS line coding.
Off
Unit is configured for AMI line coding.
*The on/off cycle of a flashing LED is faster than a blinking LED.
Table 4. Front Panel LED Conditions and States
7.2
PCB Power Options (Side Panel)
The unit has a powering option capability (pin headers on the
PCB, making connection via a push-on pin jumper) to configure
the unit for the proper powering operation. A jumper is pro-
vided to allow the installer to select either Span or Local
powering. If Span power is desired, mount the jumper over the
left two rows of pins on header P201. If Local power is desired,
mount the jumper over the right two columns of pins on header
P201.
8.
INSTALLATION
Installation consists of inspecting the equipment for damages,
following proper safety precautions, mounting the unit in the
proper slot of the mounting, and verifying the presence of power
and signalling as indicated by the status LEDs. The following
