Standard copper twin axial cable is another option, but assembly costs can be high due to the large number of individual wires, the large bend radius of a high-channel count cable can present an additional mechanical obstacle, and the bulk can impede airflow.
The newest twin axial cables have a fundamentally different construction than conventional wrapped twin axial cable.
One the other hand, the same twin axial cable product can be positioned in a multitude of ways, offering much more freedom in the orientation of the peripheral cards.
Using a high-performing twin axial cable may allow designers to reduce or altogether avoid retimer chips.
In response to acute space constraints, cable manufacturers have worked to develop thinner, more routable, high-speed twin axial cables. The cables appeared on the market in 2010, and cable assemblies based on it are currently being used for internal and external applications from SAS to QSFP+ to speeds up to 14 Gbps and potentially much higher, depending on cable length and configuration.
The 3M Twin Axial Cable, SL8800, from 3M Co., Austin, Texas, is designed to meet data rate requirements of more than 10 Gbps while making sharp turns and folds--with little or no impact on electrical performance and overall signal integrity.
The Twin Axial Cable gets its bending and folding performance from the structure that gives it a name: the fiat ribbon shield features cable pairs that are wrapped together.
In response to the problem of cable congestion, cable suppliers are striving to produce thinner, more routable high-speed twin axial cables
. Increased data rates have taken away the option of mitigating cable congestion with smaller wire gauges, so cable manufacturers must address the materials that go around wire pairs.