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Aug 29th, 2007
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1. What is the primary purpose for DWDM transport networks?



2. What does UPSR stand for and give a description?



3. What is a CLLI code and its use?



4. What is an OTDR and what is it used for?



5. What is the bandwidth of an OC-192?



6. What is the bandwidth of a T1?



7. What is the difference between ETSI and ANSI?



8. MAC addresses are the feature of ______________layer of the OSI model.



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tphelps Wed, 08/29/2007 - 08:53
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1. WDM increases the carrying capacity of the physical medium (fiber) using specific wavelengths (or lambdas).


See: http://www.cisco.com/en/US/products/hw/optical/ps2011/products_technical_reference_book09186a0080234230.html



2. UPSR is Unidirectional Path Switched Ring.


See: http://en.wikipedia.org/wiki/Synchronous_optical_networking



3. A CLLI (Common Language Location Identification) Code is an eleven character alphanumeric descriptor used to identify switches, points of interconnection, and other categories of telephony network elements and their locations.



4. Optical time-domain reflectometry (OTDR) is a popular certification method for fiber systems. The OTDR injects light into the fiber, and then graphically displays the results of detected back-reflected light. The OTDR measures elapsed transit time of reflected light to calculate the distance to different events. The visual display allows determination of loss per unit length, evaluation of splices and connectors, and fault location. OTDR zooms in to certain locations for a close-up picture of portions of the link.


See: http://www.cisco.com/en/US/tech/tk482/tk876/technologies_tech_note09186a008011b406.shtml



5. OC-192 provides up to 9953.28 Mbps (payload: 9621.504 Mbps; overhead: 331.776 Mbps)


See: http://en.wikipedia.org/wiki/OC-192



6. 1.544 Mbps


See: http://en.wikipedia.org/wiki/Digital_Signal_1



7. For Cisco gear consider ANSI = North America and ETSI as pretty much everything else.



8. Data Link Layer - Media Access Control (MAC) addresses consist of a subset of data link layer addresses. MAC addresses identify network entities in LANs that implement the IEEE MAC addresses of the data link layer. As with most data-link addresses, MAC addresses are unique for each LAN interface.


See: http://www.cisco.com/en/US/tech/tk1330/tsd_technology_support_technical_reference_chapter09186a0080759781.html

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