Cisco Smart Serial WIC2/T 26 Pin - RS232 D25 Male DTE CAB-SS-232MT= Hoja De Datos
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CAB-SS-232MT=
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CONFIGURATIONS THAT ARE SUBJECT TO SURGE EVENTS
There are several hardware configurations and applications that are more subject to damage from ESD events. These configurations include the
following:
•
Locations Subject to Electrical Storms—Any location where electrical storms are common is a good candidate site for surge protection on the
serial ports
•
Unshielded Cables—If unshielded cables are used to connect to the serial port, it is much more likely that electrical discharges will be picked up
by the cabling and damage the serial port.
•
Long Cable Runs—The longer the cable, the more susceptible it is to surge events, even if the cable is shielded.
•
Outside Wiring—If the cable runs outdoors, it is more susceptible to surge events.
•
Different Earth Grounds—If the router and the device at the other end of the serial cable are connected to different earth grounds, then the cable
can become a conduit for current that equalizes different ground potentials.
•
Installations with Multiple Serial Port Failures—If an installation has experienced multiple serial port failures in the past, it is a good candidate
for surge protection.
THE CISCO SURGE PROTECTION SOLUTION
In order to improve the network reliability of installations subject to surge events, Cisco offers the CAB-SS-SURGE surge protection cable for Smart
Serial interfaces. If a surge event (Lightning/ESD) is coupled onto the cables that interface with the serial card, energy can couple into the
transceivers on the front end of the card. The addition of a passive cable assembly (with internal clamping circuitry) can prevent this energy from
damaging the transceivers on the front end of the interface. When a voltage over the normal operating levels seen in the serial communication are
present on the front end of the interface they are clamped to ground. This cable attaches to the Smart Serial connector on the WIC-2T, WIC-2A/S,
HWIC-4T, HWIC-4A/S, or NM-16A/S on the router, and connects to the standard Smart Serial cable on the other end. See Figure 2 for a diagram of
how to connect the surge protection cable.
Figure 2. How to Connect the Smart Serial Cable
THE CISCO SURGE PROTECTION ADVANTAGE
Surge suppressors and optical isolators are available from other vendors; however the Cisco surge protection cable has a number of important
benefits.