Cable Construction — Cable Construction , usb — USB 3.0
USB 3.0: Cable Construction

Tuesday, December 8, 2009

Cable Construction


See in below figure a USB 3.0 cable cross-section. There are three groups of wires:

TP 1) UTP pair,

2) Shielded Differential Pair(SDP, twisted or twinax signal pairs),

3) Power and ground wires.

The UTP is intended to transmit the USB 2.0 signaling while the SDPs are for SuperSpeed, the shield is needed for the SuperSpeed differential pairs for signal integrity and EMI performance.Each SDP is attached with a drain wire, which is eventually connected to the system ground through the GND_DRAIN pin(s) in the connector.

A metal braid is required to enclose all the wires in the USB 3.0 cable. The braid is to be terminated to the plug metal shells, close to 360° as possible, to contain EMI.

Cable Wire Assignments :

Wire Number

Signal Name

Description

Color

1

PWR

Power

Red

2

UTP_D-

Unshielded twist pair,negative

White

3

UTP_D+

Unshielded twist pair,positive

Green

4

GND_PWRrt

Ground for power return

Black

5

SDP1-

Shielded differential pair 1, negative

Blue

6

SDP1+

Shielded differential pair 1, positive

Yellow

7

SDP1_Drain

Drain wire for SDP1

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8

SDP2-

Shielded differential pair 2, negative

Purple

9

SDP2+

Shielded differential pair 2, positive

Orange

10

SDP_Drain

Drain wire for SDP2

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Braid

Shield

Cable external braid to be 360°

Terminated on to plug metal shell

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3 comments:

  1. Thanx You. Nice Job.

    ReplyDelete
  2. please tell me about USB3.0 Bus Architecture.

    ReplyDelete
  3. what is Speeed of Usb3o Data Cable?

    ReplyDelete