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Cisco ASR-920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Aggregation Services Router Hardware Installation Guide
Chapter 2 Preparing for Installation
Site Planning
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.
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