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페이지 인쇄Chapter 2
Installing the Cisco ONS 15530
If you use twisted-pair cable in your plant wiring with a good distribution of grounding conductors, the
plant wiring is unlikely to emit radio interference. If you exceed the recommended distances, use a
high-quality twisted-pair cable with one ground conductor for each data signal when applicable.
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.
Cabling Guidelines
The size of your networks and the distances between connections depend on the type of signal, the signal
speed, and the transmission media (the type of cabling used to transmit the signals). For example,
standard coaxial cable has a greater channel capacity than twisted-pair cabling. The distance and rate
limits in the following descriptions are the IEEE recommended maximum speeds and distances for
signaling; however, you can usually get good results at speeds and distances far greater than these. For
example, the recommended maximum rate for V.35 is 2 Mbps, but it is commonly used at 4 Mbps
without any problems. If you understand the electrical problems that might arise and can compensate for
them, you should get good results with rates and distances greater than those shown here; however, do
so at your own risk.
When preparing your site for network connections to the Cisco ONS 15530, you must consider a number
of factors related to each type of interface:
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Before you install the Cisco ONS 15530, 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:
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•
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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 ONS 15530.
Powering Up the Shelf
System power is supplied by redundant –48 VDC or by redundant 120–240 VAC power supplies located
on the right side of the chassis. The Cisco ONS 15530 supports the use –48 VDC and 120–240 VAC
power supplies used together to provide redundancy.
OL-7706-01
The type of cabling required for each type (fiber, thick or thin coaxial, foil twisted-pair, or
unshielded twisted-pair cabling)
Distance limitations for each signal type
The specific cables you need to connect each interface
Any additional interface equipment you need, such as transceivers, hubs, switches, modems,
channel service units (CSUs), or data service units (DSUs)
Signal type
Signal speed
Transmission medium
Cisco ONS 15530 Hardware Installation Guide
Powering Up the Shelf
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