This section contains guidelines for wiring and cabling at your site. When preparing your site for network connections to the Cisco ASR 1000 Series Router, consider the type of cable required for each component, and the cable limitations. Consider the distance limitations for signaling, 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, channel service units (CSUs), or data service units (DSUs).
The E1 interface on the Cisco 8-Port Channelized T1/E1 SPA interface uses RJ-48c receptacles for E1 (120-Ohm) cables with RJ-45 connectors. You can use all ports simultaneously. Each E1 connection supports interfaces that meet the G.703 standards. The RJ-45 connection does not require an external transceiver. The E1 ports are E1 interfaces that use 120-ohm shielded twisted-pair (STP) cables. Shielded cables must be used to connect to the DB-25 alarm connector on both the AC and DC power supplies in order to comply with FCC/EN55022/CISPR22 Class A emissions requirements.
Shielded-twisted pair T1/E1 cables must be used with the 8-port channelized T1/E1 SPA interfaces in any Cisco ASR 1000 Series chassis. This is required for Compliance with Class A emissions requirements for EMC.
Shielded-twisted pair T1/E1 cables must be used with any of the T1/E1 NIM interfaces in any Cisco ASR 1000 Series chassis. This is required for Compliance with Class A emissions requirements for EMC.
Before you install the Cisco ASR 1000 Series Router, have all additional external equipment and cables on hand. For ordering information, contact a customer service representative.
The extent of your network and the distances between 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 in planning your network connections >prior to installing the Cisco ASR 1000 Series Router.
If wires exceed 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.