HP A6602 Installation Manual page 20

Clock
The A6602 router is designed with a clock module that provides the system time. You can set
the system time on the command line interface.
Use the clock datetime time date command in user view to set the system date and time. For
the description of the clock datetime command, refer to HP SR6600 Routers User Manual.
When a power failure occurs to the router, the clock module can continue working to ensure the
system time is correct next time the router boots. With the router powered off, the clock module
can work for at least 10 years.
When the router is powered on, pay attention to the following points:
Never replace the clock module battery.

The system time gets lost once the battery of the clock module is removed, and you need to set
the system time again on the command line interface. However, the system time will still get lost
after the router is powered off.
You can use the clock datetime, clock summer-time one-off (or clock summer-time
repeating), and clock time zone commands to set the system date and time. For details about
these commands, refer to HP SR6600 Routers User Manual.
RPS (Optional)
The redundancy power supply (RPS) can provide power supply to maintain the normal system
operation for a short period when the system power supply fails.
The RPS uses a control pin to control its output status. When the system power supply fails, it
sends a LOW signal to the control pin of the RPS. Upon receiving the LOW signal, the RPS
switches to the output status within 10 ms and starts to supply power to the router.
The A6602 supports AC power input and RPS input. They can guarantee the router to continue
working when one power supply fails, thus providing high reliability.
Table 1-21 Specifications for the RPS of the A6602
Rated output voltage
Maximum output current
Maximum output power
The RPS is an optional component not shipped with the router.

For the RPS installation, refer to "Connecting the RPS DC Power Cable" in Chapter 3 "Installing

the Router".
Port Lightning Arrester (Optional)
Before connecting an outdoor Ethernet cable to an Ethernet port, you can install a port lightning
arrester to protect the router against lightning strokes.
The following port lightning arrester can be installed on the A6602. The specifications for the
port lightning arrester are as follows:
Port protective unit–single port, maximum discharge current (8/20μs waveform): 5 kA, output
voltage (10/700μs waveform): core-core < 40 V, core-ground < 600 V.
Specification Value
12 V
14 A
168 W