This paper investigates on the propagation in a coaxial cable with the assumption that the distributed parameters are variable with the longitudinal distance from the source due to a linear temperature variation. This work addresses the problem of propagation in borehole conditions where the temperature varies by approximately 3°C/100m. In addition to the temperature variation along the coax we...

Metal-ceramic coaxial cable Fabry-Pérot interferometric (MCCC-FPI) sensors have been developed using a stainless steel tube and a stainless steel wire as the outer and inner conductors, respectively; a tubular α-alumina insulator; and a pair of air gaps created in the insulator along the cable to serve as weak reflectors for the transmitting microwave (MW) signal. The MCCC-FPI sensors have been...

Partial discharge within the dielectric of HV solid dielectric power cable greatly shortens the cable life. It is desirable to detect and locate the PD in the cable before breakdown occurs. Understanding the phenomena of propagation of the PD pulse in a power cable is fundamental to the detection and location of PDs. In this paper a power cable model represented by a coaxial transmission lossle...

The paper describes the upstream MAC protocol employed by the HP cable-modem for hybridber-coax networks. The protocol, called MXL, divides the upstream channel into two logical channels: a contention channel and a reserved channel. Cablemodem stations that need to send data have to reserve su cient bandwidth in the reserved channel. In order to send their reservation request, the stations have...

The Medium Access Control (MAC) scheme proposed by DAVIC/DVB, IEEE 802.14 and DOCSIS for the upstream channel of Hybrid Fiber Coaxial (HFC) access networks is based on a mixable contention-based/contention-less time slot assignment. Contention-less slots are assigned by the head end to end stations according to a reservation scheme. Contentionbased slots are randomly accessed by active terminal...

DOCSIS is the defacto industry standard for cable internet to the home. In this letter, we examine the delay characteristics of commercially deployed DOCSIS networks. We focus on four mechanisms of the DOCSIS MAC operation and develop a computationally simple simulator to reproduce the phenomena produced by these mechanisms. In reproducing these phenomena using our simulator, we demonstrate tha...

Cable-modem (CM) technology is being developed to provide high-speed multimedia services to the subscribers’ homes over the existing hybrid-fiber-coax (HFC) infrastructure of cable TV networks. The paper proposes an efficient scheme for combining asynchronous and synchronous traffic on the upstream channel of a CM network when segmentation of the asynchronous packets is to be avoided, e.g. beca...