Subscriber service drop coax is described as what in relation to semi rigid cables?

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Subscriber service drop coax is described as similar to semi rigid but smaller because it uses a coaxial construction that preserves impedance and shielding like semi rigid cables, but in a smaller diameter to make outdoor installation from poles or cabinets to the customer easier to route. The idea is that you get the same RF performance and rugged outdoor characteristics as semi rigid, with a more compact size suitable for service drops. It wouldn’t be described as larger and stiffer, which would hinder installation; it isn’t unshielded, since shielding is essential for maintaining signal integrity; and it isn’t exactly the same as semi rigid in size, since the service drop is smaller to fit practical routing needs.