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Cisco ASR-920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Aggregation Services Router Hardware Installation Guide
Chapter 1 Overview
Cisco ASR 920 Series Routers Features
RS232-EIA Console Port
The RS232-EIA console port provides transmission (Tx), reception (Rx), and ground (Gnd).
Note The RS232-EIA console port is enabled only through the Cisco-designed cable adapter USB type A
cable to RJ-45 adapter cable. To use this port, disable the flow control on the terminal.
USB Console
A single USB 2.0 Type-A receptacle is provided on the front panel of the Cisco ASR 920-24SZ-IM,
ASR-920-24SZ-M, ASR-920-24TZ-M Router for providing console access to ROMMON, Cisco
IOS-XE and diagnostics. While it uses the Type-A connector, it operates as a USB peripheral only for
connection to an external host computer. This interface requires the use of a Type-A to Type-A connector
instead of a standard USB cable.
Note Use of the USB console is mutually exclusive of the RS232 console port. When the USB console cable
is inserted in the USB console port, the RS232 console port is automatically disabled. This interface
requires the use of a Type-A to Type-A USB cable.
Note To use the USB console, you must download and install EXAR driver XR21x1410 on the external host
computer.
USB Mass Storage
A single USB 2.0 Type-A receptacle is provided on the front panel of the Cisco ASR 920-24SZ-IM,
ASR-920-24SZ-M, ASR-920-24TZ-M Router for inserting external USB mass storage devices, such as
standard USB flash drives. This interface is used to load images, load or store configurations, write logs,
and so on. It supports operation up to 12Mbps.
Maximum memory supported in ROMmon is 8GB and in Cisco IOS is 16GB.
RS232 Auxiliary Console Port
The RS232 Aux console port provides transmission (Tx), reception (Rx), and ground (Gnd).
Note The RS232 Aux console port is enabled only through the Cisco-designed cable adapter from USB type
A cable to RJ-45 adapter cable. To use this port flow control must be disabled.
Note This is a debug-only port. it is recommended that this port be used by field service engineers only.
Power Supply and Fans
The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router support either AC or DC
power supplies in a 1+1 redundant 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.
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