More than 8 GB is not supported in ROMMON mode.
Note
Online Insertion and Removal
The router supports the following OIR operations:
• When an SFP is removed, there is no effect on traffic flowing on other ports.
• When an SFP is installed, the system initializes that port for operation that is based on the current
configuration. If the inserted SFP is incompatible with the current configuration for that port, the port
does not become operational until the configuration is updated.
• Both power supplies are installed and active, the load may be shared between them or a single PSU could
support the whole load. When a power supply is not working or the input cable is removed, the remaining
power supply takes the entire load without disruption.
Power Supply and Fans
The Cisco ASR-920-20SZ-M Router supports a 1+1 redundant configuration with the combination of an AC
and a DC, or two AC, or two DC power supplies. One AC and one DC power supply in the same router is
also a supported configuration. The PSUs are hot-swappable. Load is shared between PSUs when both the
PSUs are inserted and powered-up. Status LED provided on both AC and DC PSU indicates the status and
output condition.
DC PSU can be switched on or off using a switch on the front panel of the DC PSU.
Note
This product requires surge protection as part of the building installation. To comply with the Telcordia
GR-1089 NEBS standard for electromagnetic compatibility and safety, an external surge protective device
(SPD) is required at the AC power service equipment.
Note
For DC systems, if a surge of more than 1KV is expected, add an appropriate external surge protective device.
Note
The Cisco ASR-920-20SZ-M Router has six fixed fans as a part of the system. The system is designed to
operate at its maximum operating temperature of 70ºC and at an altitude of 300 meters. If a single fan fails,
the system runs at a maximum operating temperature of 65ºC. The fan is not removable and therefore, during
a failure, the system must be replaced.
In case of fan failure, we recommend that you get a qualified technician to replace the faulty device within
96 hours.
Note
Cisco ASR-920-20SZ-M Aggregation Services Router Hardware Installation Guide
13
Overview
Online Insertion and Removal