NPT-1020 Installation and Maintenance Manual
Installing Equipment
ECI Telecom Ltd. Proprietary
4-43
4.9.4
Routing and Connecting Electrical Interface Cables to
the NPT-1020
Information in this section supplements that regarding the connection of power, alarm, and grounding
cables described in previous sections.
Connect the cables to the equipment connectors according to the information appearing in the relevant
cabling diagrams or tables. To identify the physical location of connectors, see the equipment panel figures
in the
NPT Product Line Reference Manual
.
4.9.4.1
Routing and Connecting E1 Cables for Balanced E1 Interfaces
E1 cables are used for connecting the balanced E1 (2 Mbps) interfaces on the PME1_21 panel. Each cable
consists of a total of 21 E1 twisted pairs (transmit and receive) supporting 21 E1s. The cable end connecting
to the PME1_21 module is terminated with a 100-pin SCSI male connector.
To connect E1 cables to the PME1_21:
1.
Arrange the E1 traffic cables and route them to the rack side rails.
2.
Pull each E1 cable down to the level of the NPT-1020 platform.
3.
Bend the cable and thread it through the side cable guides of the rack and through the appropriate
opening near the platform until the cable connector is positioned against the appropriate place. Use
cable ties as required to fasten the cable to the rack side rails.
4.
Use a cabling diagram of the site to associate the PME1_21 module with the appropriate DDF
connections.
5.
Connect the cable connector to the corresponding connectors on the PME1_21 front panel.
6.
Secure the cable connector to the PME1_21 connector with the cable connector screws. Tighten the
screws manually. If you cannot reach the screws with your hands, use an adjustable-torque flatblade
screwdriver (maximum blade size 0.6). Set the tightening torque to 40 N cm to 44 N cm.
C
AUTION
: Do not exert excessive tightening torque to secure the cable connector as this may
damage the PME1_21.
4.9.4.2
Routing and Connecting Cables to the E1 Interfaces on the
NPT-1020 Panel
The NPT-1020 has 21 x E1 interfaces on its front panel, connected through a 2 x 50-pin SCSI connector
marked
E1 (1-21)
. The connection to these interfaces is made by a multipair cable (2 x 21 120
Ω
twisted
pairs) terminated with a 2 x 50-pin SCSI male connector (the other side of the cable is open and connected
to the customer's DDF).