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Spinpoint M8U-Internal Product Manual REV 3.4
37
INSTALLATION
Figure 6-6: USB Series “B” Plug Interface
6.2.1.3 Cable
USB cable consists of four conductors, two power conductors, and two signal conductors. High-/full-speed
cable consists of a signaling twisted pair, V
BUS, GND, and an overall shield. High-/full speed cable must be
marked to indicate suitability for USB usage. High-/full-speed cable may be used with either low-speed, full-
speed, or high-speed devices. When high-/full-speed cable is used with low-speed devices, the cable must
meet all low-speed requirements. Low-speed recommends, but does not require the use of a cable with twisted
signaling conductors.
6.2.1.4 Cable Assembly
This chapter describes three USB cable assemblies: standard detachable cable, high-/full-speed
captive cable, and low-speed captive cable.
A standard detachable cable is a high-/full-speed cable that is terminated on one end with a Series “A” plug
and terminated on the opposite end with a series “B” plug. A high-/full-speed captive cable is terminated
on one end with a Series “A” plug and has a vendor-specific connect means (hardwired or custom
detachable) on the opposite end for the high-/full-speed peripheral. The low-speed captive cable is
terminated on one end with a Series “A” plug and has a vendor-specific connect means (hardwired or
custom detachable) on the opposite end for the low-speed peripheral. Any other cable assemblies are
prohibited.
6.2.1.4.1 Standard Detachable Cable Assemblies
High-speed and full-speed devices can utilize the “B” connector. This allows the device to have a standard
detachable USB cable. This eliminates the need to build the device with a hardwired cable and minimizes
end user problems if cable replacement is necessary.
Devices utilizing the “B” connector must be designed to work with worst case maximum length detachable
cable. Standard detachable cable assemblies may be used only on high-speed and full-speed devices. Using a
high-/full-speed standard detachable cable on a low-speed device may exceed the maximum low speed cable
length. Figure 6-7 illustrates a standard detachable cable assembly.