CONTENTS
1.
General ......................................................................... 1
2.
Installation .................................................................... 3
3.
Turnup .......................................................................... 6
4.
Operation ...................................................................... 6
5.
Testing .......................................................................... 6
6.
7.
Specifications ............................................................. 22
8.
Maintenance ............................................................... 22
9.
NIU3 PM.......................................................... 1
NTWK LBK Active ....................................... 12
Pattern Active................................................. 12
Screen I .......................................................... 17
Screen II ......................................................... 17
TABLES
61212075L2-5D
Installation and Maintenance Practice
Trademarks: Any brand names and product names included in this document are
trademarks, registered trademarks, or trade names of their respective holders.
CLEI Code: NCD3EGNA_ _
IU3
1212075
STATUS
LOS = RED
AIS =AMBER
C-BIT = GR
IDLE =AMBER
M13 = GR
IDLE =AMBER
LBK
LOS = RED
AIS =AMBER
C-BIT
M13
LBK
FUSE ALARM
Figure 1. NIU3 PM
1. GENERAL
The DS3 Network Interface Unit with Performance
Monitoring (NIU3 PM) provides a demarcation and
loopback point for DS3 circuits. The NIU3 PM can be
deployed as a single unit, or in two different shelf
configurations with up to 12 units. The unit performs a
loopback at the customer interface toward the network
when initiated either remotely from the Test Center or
CO, or locally from the unit's front panel
pushbutton, or through the RS-232 craft interface.
The NIU3 PM provides performance monitoring and
event history information through a DB-9 RS-232 craft
interface. The NIU3 PM is transparent to data
transmission during normal operation.
the NIU3 PM, P/N 1212075L2.
Section 61212075L2-5D
Issue 4, January 2004
T
W
K
C
U
S
T
LBK SEL:
TWK: 1X & HOLD
CUST: 2X & HOLD
DUAL: 3X & HOLD
TWK MO
CUST MO
LBK SEL
Figure 1
shows
1
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