Neil Ashby Mar 1, 2020:

No worries Esperanza, and definitely no need to apologise. When I first saw the question I immediately thought "masa y peso". ;@)
Saludos,

Esperanza P. Íñiguez Feb 27, 2020:

"volumen y masa" Hi, Neil. You are right: "mass" refers to "volume" in this context. As I have seen many texts in Spanish using "masa" as "volumen" (space occupied) and it can be a synonym, last night I assumed my proposal was the most accurate one. After reading your comment and checking some texts on Ethernet, I see that it would be more accurate to say "volumen y masa", as proposed by Juan Gil. - Sorry for the confusion. I just realised it's not a good idea to answer terminology questions in the middle of the night. Thanks for your input! :)

Neil Ashby Feb 27, 2020:

I agree with Juan: in this case "mass = bulk = volume".
Esperanza, you're right about the definitions of mass and weight strictly in physics terms, but they don't apply here, this isn't physics 101.
I don't know much about ethernet cabling, but I don't think they are discussing it in terms of mass (kg) and weight (kg/ms-2). Besides the weight is always fixed by the mass, so why discuss both? The only reason to discuss both would be in the scenerio of different gravitational forces. So unless we're talking about cabling at sea level compared to at 3,000 metres (in which case the difference would still only be minimal, if not insignificant) or in outer space, then I think it's safe to assume it doesn't refer to weight (kg/ms-2).
It's a classic lay person's mistake, when they use "weight" they really mean "mass"; normally it's no problem, but here it is compounded by the fact that they use "mass" to mean "bulk/volume".

Esperanza P. Íñiguez Feb 27, 2020:

De acuerdo con el siguiente enlace (y otras fuentes), en términos de física, la masa es la cantidad de materia que contiene un cuerpo y el peso es la acción que ejerce la fuerza de gravedad sobre el cuerpo.

La masa de un objeto siempre será la misma, sin importar el lugar donde se ubica. En cambio, el peso del objeto variará de acuerdo a la fuerza de gravedad que actúa sobre este.

Fuente: https://www.diferenciador.com/diferencia-entre-masa-y-peso/

Juan Gil Feb 27, 2020:

Hay que interpretar aquí Aunque dice 'mass and weight', habla que el usar cableado de un solo par ayuda a descongestionar las canalizaciones si se compara con el cableado tradicional de 4 pares, ya que ese 'mass and weight' en aquel es el 25% del de 4 pares, lo cual ayudaría a tener mayor flexibilidad en las opciones de enrrutamiento.

Es claro de que trata: yo usaría 'masa' (por su unidad kilogramo) y 'volumen' (por el espacio ocupado).

Ni 'peso y masa' ni 'peso y volumen'.