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Installing the Cisco ASR 920 Series Router
Connecting a Management Ethernet Cable
When using the Ethernet Management port in the default mode (speed-auto and duplex-auto) the port operates
in the auto-MDI/MDI-X mode. The port automatically provides the correct signal connectivity through the
Auto-MDI/MDI-X feature. The port automatically senses a crossover or straight-through cable and adapts to
it.
However, when the Ethernet Management port is configured to a fixed speed (10, 100, or 1000 Mbps) through
command-line interface (CLI) commands, the port is forced to the MDI mode.
When in a fixed-speed configuration and MDI mode:
• Use a crossover cable to connect to an MDI port
• Use a straight-through cable to connect to an MDI-X port
To comply with the Telcordia GR-1089 NEBS standard for electromagnetic compatibility and safety,
Caution
connect the Management Ethernet ports only to intra-building or unexposed wiring or cable. The
intrabuilding cable must be shielded and the shield must be grounded at both ends. The intra-building
port(s) of the equipment or subassembly must not be metallically connected to interfaces that connect to
the OSP or its wiring. These interfaces are designed for use as intra-building interfaces only (Type 2 or
Type 4 ports as described in GR-1089-CORE) and require isolation from the exposed OSP cabling. The
addition of Primary Protectors is not sufficient protection in order to connect these interfaces metallically
to OSP wiring.
Installing and Removing SFP and SFP+ Modules
The Cisco ASR 920 Series Router supports a variety of SFP and SFP+ modules, including optical and Ethernet
modules. For information on how to install and remove SFP and SFP+ modules, see the documentation for
the SFP or SFP+ module at:
http://www.cisco.com/en/US/partner/products/hw/modules/ps5455/prod_installation_guides_list.html
For information about inspecting and cleaning fiber-optic connections, see:
partner/tech/tk482/tk876/technologies_white_paper09186a0080254eba.shtml
Caution
We recommend that you wait for 30 seconds between the removal and insertion of an SFP on an interface
module. We recommend this to allow the transceiver software to initialize and synchronize with the Cisco
ASR 920 Series Router. Changing an SFP more quickly could result in transceiver initialization issues
that disable the SFP.
Connecting a USB Flash Device
To connect a USB flash device to the router, insert the memory stick in the USB port labeled USB MEM.
The Flash memory module can be inserted only one way, and can be inserted or removed regardless of whether
the router is powered up or not.
Cisco ASR-920-12SZ-IM Aggregation Services Router Hardware Installation Guide
Connecting a Management Ethernet Cable
http://www.cisco.com/en/US/
87
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