Table 4: Guidelines for N2 network topology
Category
Rules and Maximums
Terminations
Preferred Termination Configuration
: Two N2 devices with EOL switches in the ON position, one
at each end of each N2 Bus segment
Minimally Required Termination Configuration
: At least one N2 device with an EOL switch in
the ON position somewhere on each N2 Bus segment
Setup and Adjustments
Installing the Data Protection Battery
Important:
Do not apply 24 VAC power to the
network engine before installing the data protection
battery.
To install the data protection battery for the NAE-S:
1. Remove the battery from its packaging. Remove the
battery cover on the NAE-S to expose the battery
compartment (Figure 8).
2. Carefully plug the NAE-S battery connector from
the battery compartment into the connector on the
3. Place the battery into the compartment (Figure 8).
4. Slide one end of the battery strap into the hole on
the opposite side of the strap (Figure 8), and loop the
strap tightly around the battery to minimize battery
movement.
5. Replace the cover of the battery compartment.
6. Apply 24 VAC power to the network engine.
Important:
The data protection battery must
maintain a small residual charge. The battery ships
from the factory with a small residual charge. You
should connect 24 VAC power to the network engine
immediately after connecting the battery to ensure
that the battery does not completely lose its charge,
which may damage the battery.
Note:
The 24 VAC power to the network engine
charges the data protection battery. At initial
startup, the battery requires a charging period of
at least 2 hours before it supports data protection
if power fails. Maximum protection (up to three
consecutive power failures without recharging time)
requires a 24-hour charging period.
Figure 8: NAE-S Data Protection Battery
Setting the End-of-the-Line Switches
The network devices at each end of an FC Bus segment
must be set as network terminated devices. The network
engine has two EOL switches (one for each FC Bus) that
enable you to set the NAE-S as a network terminated
device on the bus.
To set the network engine as an FC Bus terminated device,
position the switch on the EOL switch block to the ON
position (Figure 9).
Figure 9: FC Bus EOL Switch in the Factory Default ON
(Up) Position
Note:
The NAE-S is shipped with the EOL switches
for both FC Buses in the initial factory position, ON
(Figure 9). If the NAE-S is not a terminated device on
the FC Bus, reposition the switch on the EOL switch
block to the Off (down) position.
Set the EOL switches appropriately for the FC A and FC B
buses. The NAE-S follows the same rules as other switch-
terminating devices listed in the
Setting Terminations
sections of the
N2 Communications Bus Technical Bulletin
(LIT-636018)
and the
MS/TP Communications Bus Technical
Bulletin (LIT-12011034)
.
Powering on the NAE-S
Before powering the NAE-S network engine, make sure
the cable from the encryption board power supply is
connected to the engine. After applying 24 VAC power, the
network engine requires approximately 3 minutes to start
up and become operational.
Startup is complete and the NAE-S is ready to be
configured when the (green) RUN LED is On steady and
the (red) GEN FAULT LED is Off. See
for LED locations.
Disconnecting Power from NAE-S
Important:
The data protection battery must be
installed and charged before disconnecting the 24
VAC supply power.
The 24 VAC supply power is disconnected from the
network engine by removing the terminal block plug from
the power terminal port on the unit (Figure 2).
If the 24 VAC supply power to the network engine
is disconnected or lost, the network engine is
nonoperational. The POWER LED remains On, and the
NAE-S Installation Guide
6
