The cable assembly specification is divided into the categories. All categories represent the box-to-box application space, which is sometimes referred to as “external/desktop and consumer electronics (CE).” All passive and active cables may function at the link rates provided and in any standard link rate that is lower. All passive cables and LRD active cables shall be reversible. LTTPR re-timer cables may be nonreversible as long as a directionality is clearly marked as described.
Cable-Connector Assembly Specifications (for Box-to-box)
|Cable Type||Supported Link Rate (Bit Rate)||Definitiona|
|DP80||20 Gbps/lane (UHBR20)
13.5 Gbps/lane (UHBR13.5)
|Extends the DP capability by using enhanced mDP receptacles and plugs, enhanced full-size DP (FSDP) Type 2 receptacles and plugs, improved footprints, and mandatory paddle card/ cable assemblies, as well as other refinements and tightening of the design and manufacturing mandates. Designed to follow the USB4 Gen 3 passive cable requirements.|
|DP40||10 Gbps/lane (UHBR10)||Same as for DP80, but allows for longer cables. Used with enhanced mDP receptacles and plugs, and enhanced FSDP Type 1 or Type 2 receptacles and plugs.|
|DP8K||8.1 Gbps/lane (HBR3)||Premium version of the HBR cable, but with improved specification tolerances.|
|HBR||5.4 Gbps/lane and lower (HBR2 and lower3)||Original performance electrical tolerances.|
A DP cable assembly is composed of two plug-type connectors that terminate at both ends of a bulk cable. The plug on either end may be an FSDP, mDP, or USB-C plug. For DP80 cable assemblies, the DP plugs shall be the enhanced mDP types. For DP40 cable assemblies, the DP plugs shall be the enhanced mDP or the enhanced FSDP Type 2. For the other cables, any DP/mDP type may be used.
Supported Cable Assembly Types
|C1||Cable assembly with an FSDP plug on each end.||Figure 1|
|C2||Cable assembly with an mDP plug on one end and an FSDP plug on the other end.||Figure 2|
|C3||Cable assembly with an mDP plug on each end.||Figure 3|
|C4||Cable assembly with an FSDP plug on one end and a USB-C plug on the other end.|
|C5||Cable assembly with an mDP plug on one end and a USB-C plug on the other end.|
|C6||Cable assembly with an enhanced mDP plug on both ends (DP80/DP40).|
|C7||Cable assembly with an enhanced mDP plug on one end and a USB-C plug on the other end (DP80/DP40).|
Figure 1: Type C1 Cable Assembly
Figure 2: Type C2 Cable Assembly
Figure 3: Type C3 Cable Assembly
In addition, a Sink device may have a permanently attached cable with an FSDP, mDP, or USB-C plug. Depending on the link rate capability, the DP plugs may be legacy –or– enhanced types.
A DP extension cable is designed specifically to be used in conjunction with displays (or adapters) with a permanently attached cable with an mDP plug, a DP-to-DP extension cable can be built to work in an implementation-specific usage, but cannot ensure a general interoperability.
mDP Plug-to-mDP Receptacle Extension Cable
|E1||Cable assembly with an mDP plug on one end and an mDP receptacle on the other end.||Figure 4|
Figure 4: Type E1 Extension Cable
Figure 5: DP-to-DP (FSDP or mDP) Cable Testing with Test Fixtures
Figure 6: USB-C-to-USB-C Cable Testing with Test Fixtures
Figure 7: USB-C-to-DP (FSDP or mDP) Cable Testing with Test Fixtures
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