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All FAQs » Fiber Optic Forum FAQ » 4.1 Level 3

FAQ RevisionsEditors: RedXII1234 See Profile, Oxygen See Profile
Last modified on 2005-07-25 22:30:12
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4.1 Level 3

·What does 'Level 3' mean?
·Interface and port speeds
·What is the scope of Level 3's Network?
·Level 3 Network Maps
·What does a private fiber loop look like?

What does 'Level 3' mean? (#4232)
The term "Level 3" comes from the layered set of protocols, or standards that are often used in the industry to describe networks. The Company's strategy generally calls for services to be provided in the first three levels of these technical specifications.

Source: Level 3

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by RedXII1234 See Profile

Interface and port speeds (#4235)
Interface and port speeds available by region:
 U.S.Europe
SerialDS-3DS-3
POSOC-3, OC-12, OC-48STM-1, STM-4
Ethernet100BT, Gigabit Ethernet100BT, Gigabit Ethernet


Level 3 runs single mode fiber optic cable to the customers premise. The fiber cable can have any type of hardware on both ends.

For example:

100BT Ethernet / Gigabit Ethernet:

If a customer needs Gigabit Ethernet, Level 3 will have a Cisco router with a Gigabit port on their end.


The customer will have a Gigabit switch with a GBIC (Gigabit Interface Converter) connected to the fiber optic cable.



Optical Carrier Level connections and SDH:

If POS type connection is requested, expensive hardware must be used by both ends.

Level 3 will use Fujitsu Multiplexers:



The customer will need an OC level router, such as the Juniper Networks M20:



Serial Connections - DS3/T3:

The telco needs to run a dedicated DS3 circuit.

The customer needs to have a DS3 Inverse access multiplexer and a router supporting HSSI (High Speed Serial Interface).

One of the HSSI compatible routers is a Cisco 3600 Series:



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by RedXII1234 See Profile
last modified: 2002-06-12 22:53:43

What is the scope of Level 3's Network? (#4233)
An in depth description of the Level 3 Network can be found on our Web site here.

Source: Level 3

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by RedXII1234 See Profile

Level 3 Network Maps (#4234)


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by RedXII1234 See Profile

What does a private fiber loop look like? (#4246)
Update pictures coming in a few days... =)

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by Oxygen See Profile
last modified: 2005-01-20 01:46:04


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