![TIA Approved](http//info.belden.com/webadmin/blog/images/TIA-Approved.jpg "TIA Approved")
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This week, the industry received some big news: The TIA TR-42.7 subcommittee agreed to include modular plug terminated links (also known as “direct connect”) in a TIA-568.2-D normative annex. The annex provides guidance to IT professionals to ensure a proper direct-connect cabling arrangement. Several Belden staff are closely involved with the Telecommunications Industry Association (TIA), holding many leadership positions within the organization. We’re always looking out for the ICT industry, searching for ways to improve existing technology and streamline installation – which is why we presented the problem to TIA and lead the effort to have the direct-connect termination method fully supported.
What does this mean? Now, RJ45 modular plugs can be terminated directly onto horizontal cabling and measured in the field. This allows a variety of devices, such as [wireless access points](http://www.belden.com/blog/datacenters/adding-more-wireless-access-points-what-it-means-for-networks.cfm), surveillance cameras and HDBaseT monitors, to be plugged without the need for an outlet and a patch cord.
## Benefits of Direct Connect
ANSI/TIA-568-C.2 currently requires horizontal cable to be terminated on a telecommunications outlet to provide flexible user access. But TIA also realizes that, in certain cases, there is a need to terminate [horizontal cables](https://www.linkedin.com/pulse/key-components-form-structured-cabling-system-orenda-ma) to a plug that is directly plugged into a device.
Direct-connect assembly uses a single cable to connect a device at one end; the other cable end is terminated with a jack in a patch panel in the telecommunications room.
This allows for efficient power delivery with the lowest channel insertion loss and gives installers the flexibility to eliminate the need for a jack and cord to connect devices.
## What the Modular Plug Terminated Link Test Involves
To be recognized by TIA, [direct connect](http://www.belden.com/blog/datacenters/A-Way-to-Simplify-Your-Infrastructure-Direct-Connect-Assembly.cfm) needs to meet the requirements of a 90 m permanent link during testing.
During testing, the modular plug terminated link (MPTL) will have a jack on one end and a plug on the other end, with an optional consolidation point (plug-to-plug isn’t supported). Proper testing requires a permanent link adapter and a patch cord test head.
The figure below represents the topology of a modular plug terminated link test configuration.
![Modular Plug Terminated Link](http//info.belden.com/webadmin/blog/images/modular-plug-terminated-link.PNG "Modular Plug Terminated Link")
The modular plug terminated link needs to comply with the permanent link transmission requirements of ANSI/TIA-568-C.2 clause 6.3 to be recognized.
## Direct-Connect Solutions from Belden
This news about modular plug terminated links mixes well with the recent introduction of the Belden REVConnect connectivity system, which eliminates the jack, box and patch-cord assembly normally needed to plug into devices.
A single termination process works for every application – REVConnect is a complete connectivity solution for Category 5e, 6 and 6A shielded and unshielded cable. You can switch from a jack to a plug or vice versa without having to re-terminate. Learn more [here](http://info.belden.com/ecos/revconnect).
<div style="text-align: center;">[![IoT WP CTA](http//info.belden.com/webadmin/blog/images/IoT WP CTA_86060.png "IoT WP CTA")](http://info.belden.com/ecos/iot-convergence-wp)</div>Source: Spine and Leaf (1st) test
Layer 3 design with spine and leaf
* prefix list automation:
# Network design
### Google new network design
Read this paper: [Conferences sigcomm](http://conferences.sigcomm.org/sigcomm/2015/pdf/papers/p183.pdf)
### Facebook DC design
Information about 1st design @FB:
Facebook DC design Next Gen:
Introducing data-center fabric the next generation facebook DC network
A video presentation about L3 spine and leaf @FB (useful demo @2’22 »)
Pictures of FB DC:
[Photo tour new facebook data-center in iowa (2014)](http://www.datacenterknowledge.com/archives/2014/11/20/photo-tour-new-facebook-data-center-in-iowa/)
### LinkedIn DC design plus L3
DC design spine and leaf and water-cooling at LinkedIn
And from linkedin blog:
### Other company L3 design
An old article from Metadata blog:
### Tools for network BGP and design
IETF draft for L3 in the DC:
Presentation from Nanog about
How to load balance applications in a L3 DC (Replay of a meetup)