Reference Material - Cabling Modular Plug Gold Plating
The contacts used in modular plugs are gold plated and the plating thickness affects the electrical characteristics of the contact and it’s resistance to corrosion. The thickness of Gold plating is usually measured in µ” (Microinches) or sometimes in microns.
Thickness of Contact Gold Plating Microinch Microns Comments
6µ” 15µ” 30µ” 50µ”
0.15µm Not recommended. Sometimes used on poor quality or unapproved telephones.
0.38µm The minimum quality for satisfactory voice connections. Unsuitable for data.
0.76µm Satisfactory for voice connections and low speed data only.
1.27µm Provide reliable voice & data connection to Cat-5 (when terminated correctly).
Straight-thru and Cross-over Cords
Modular Cords Flat modular cord can be wired in either straight-thru or cross- over configuration. Cross-over wiring is most commonly used for connection of equipment such a telephones, modems, faxes and terminals to a modular wall outlet. However, voice applications will usually tolerate either configuration. Data equipment may use either straight-thru or cross-over depending on the equipment’s specifications. Accessories such as couplers and double adaptors are available in straight- thru or cross over models.
Flat Modular Cord Wiring Configurations Straight-thru Polarity
End A Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8
End B Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8
Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8
Cross-over Polarity End A
Category 5 & 5E Patch Cords
The majority of patch cords used for connections between jacks on a patch panel or from a PC or terminal to a wall outlet are wired straight-thru in T568A configration. Cross-over cords are used to daisy-chain switches/hubs or for direct connection of 2 computer network interface cards. Cross-over cord wiring is T568A to T568B with the wiring of the green and orange pairs being transposed.
Category 5, 5E & 6 Modular Cord Wiring Configurations Straight-thru Polarity
End A Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8
End B Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8
Cross-over Polarity End A
Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8
End B Pin 3 Pin 6 Pin 1 Pin 4 Pin 5 Pin 2 Pin 7 Pin 8
Checking Category 5 & 5E Modular Cord Wiring Polarity Hold both ends of the modular cord with the plugs alongside each other. Ensure that the gold contacts of both plugs are facing you and the cord from each plug is leading down. The gold contacts are numbered from left to right with the plugs in this orientation. Compare the color sequence from left to right. If the color sequence on both plugs, the cord is wired straight- thru. If the color sequence of the green and orange pairs is transposed on the second plug, the cord is wired cross-wire.
Straight-thru
End B Pin 8 Pin 7 Pin 6 Pin 5 Pin 4 Pin 3 Pin 2 Pin 1
Checking Flat Modular Cord Wiring Polarity Hold both ends of the modular cord with the plugs alongside each other. Ensure that the gold contacts of both plugs are facing you and the cord from each plug is leading down. The gold contacts are numbered from left to right with the plugs in this orientation. Compare the color sequence from left to right. If the colors appear in the same sequence on both plugs, the cord is wired straight-thru. If the color sequence is reversed on the second plug, the cord is wired cross-over.
Straight -thru Cross-over Cross-over
Cable Categories
Category Frequency Max Data Use Speed
1&2 3
4 5
5E 6 7
www.accesscomms.com.au Sales and Support, Call: 1300 ADI ADI Technical Support, Call: 1800 220 345
www.adiglobal.com/au 169
< 1MHz 56 Kbps Voice & low speed data only 16 Mhz
10Mbps Voice & low speed LAN (10-Base-T, 4 Mbps Token Ring)
20MHz 100MHz 125MHz
16Mbps Voice & moderate speed LAN 100Mbps Voice & high speed LAN 1000Mbps Voice & high speed LAN
250MHz >1000Mbps Gigabyte LAN 600MHz >1000Mbps Future applications
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