The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router installation must comply
with all the applicable codes, and is approved for use with copper conductors only. The ground
bond-fastening hardware should be of compatible material and preclude loosening, deterioration, and
electrochemical corrosion of hardware and joined material. Attachment of the chassis ground to a central
office or other interior ground system must be made with a 6-AWG gauge wire copper ground conductor
at a minimum.
Note
For information on power specifications, see
Power Supply Specification
table.
Electrical Circuit Requirements
Each Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router requires a dedicated electrical
circuit. If you equip the router with dual-power feeds, provide a separate circuit for each power supply to
avoid compromising the power redundancy feature.
The Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Routers can be powered by a DC source
or an AC source. Ensure that equipment grounding is present and observe the power-strip ratings. Make sure
that the total ampere rating of all the products plugged into the power strip does not exceed 80% of the rating.
Site Cabling Guidelines
This section contains guidelines for wiring and cabling at your site. When preparing your site for network
connections to the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router, consider the
type of cable required for each component, and the cable limitations. Consider the distance limitations for
signaling, electromagnetic interference (EMI), and connector compatibility. Possible cable types are fiber,
thick or thin coaxial, foil twisted-pair, or unshielded twisted-pair cabling.
Also consider any additional interface equipment you need, such as transceivers, hubs, switches, modems,
channel service units (CSU), or data service units (DSU).
Before you install the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router, have all the
additional external equipment and cables on hand. For information about ordering, contact a Cisco customer
service representative.
The extent of your network and the distances between the network interface connections depend, in part, on
the following factors:
•
Signal type
•
Signal speed
•
Transmission medium
The distance and rate limits referenced in the following sections are the IEEE-recommended maximum speeds
and distances for signaling purposes. Use this information as a guideline when planning your network
connections
prior
to installing the Cisco ASR 920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Router.
If wires exceed the recommended distances, or if wires pass between buildings, give special consideration to
the effect of a lightning strike in your vicinity. The electromagnetic pulse caused by lightning or other
high-energy phenomena can easily couple enough energy into unshielded conductors to destroy electronic
devices. If you have had problems of this sort in the past, you may want to consult experts in electrical surge
suppression and shielding.
Cisco ASR-920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Aggregation Services Router Hardware Installation
Guide
37
Preparing for Installation
Site Cabling Guidelines
