A fiber-to-the-curb (FTTC) system using subcarrier multiplexing on the optical fiber and asymmetric digital subscriber lines (ADSL) on the unshielded twisted-pair is proposed to deliver broadband services. In contrast to the current ADSL based FTTC approaches, the digital multiplexing/demultiplexing process is moved back to the central office by using subcarrier multiplexing in fiber transmissi...

This study will present a deep research regarding the characteristics of ADSL in term of its advantages and disadvantages. The performance analysis concentrates on the impact of the services. Tests are being carried out to prove that the performance is affected by loop length and also noise issue as well as their impairment issues especially crosstalk. Crosstalk modeling is performed to discuss...

In theory, an ADSL router can provide an additional layer of security to a wired and wireless network through; access control, wireless encryption, firewall rule sets, and network event logging. An ADSL router may also contain the users’ usage habits and broadband account credentials. However, end-users may be unaware of the intricacies of the security measures available and the potentially con...

BACKGROUND Adenylosuccinate lyase (ADSL) deficiency is a defect of purine metabolism affecting purinosome assembly and reducing metabolite fluxes through purine de novo synthesis and purine nucleotide recycling pathways. The disorder shows a wide spectrum of symptoms from slowly to rapidly progressing forms. The most severe form is characterized by neonatal encephalopathy, absence of spontaneou...

BACKGROUND AMP activated protein kinase (AMPK) regulates key metabolic reactions and plays a major role in glucose homeostasis. Activating the AMPK is considered as one of the potential therapeutic strategies in treating type-2 diabetes. However, targeting AMPK by small molecule mediated approach can be challenging owing to diverse isoforms of the enzyme and their varied combination in differen...

Adenylosuccinate lyase (ADSL) and lipoprotein lipase (LPL) are key enzymes in the metabolism of inosine monophosphate (IMP) and fat mass, which are important factors in meat quality evaluation. In this study, we selected 50 hens from the ISA B-line layers and Guangxi Yellow chickens, slaughtered the chickens at 120 days old, and analyzed polymorphisms in the ADSL and LPL genes using the high-re...

Thanks to their high bandwidth ability, Asymmetric Digital Subscriber Lines (ADSL) and Very high speed DSL (VDSL) am access technologies that permit the transmission of several applications simultaneously on telephonic subscriber lines. Considering that these applications may require a different Quality of Service (QoS), and particularly different Bit Error Rates (BER), for transmission, this p...

We define a family of high-rate binary LDPC codes for ADSL. We present simulation results that show the performance that can be achieved by these codes on a binary additive white Gaussian noise (AWGN) channel. LDPC codes exhibit performance very close to the capacity limit with moderate decoding complexity and are thus well suited for channel coding applications in ADSL systems.

This letter presents a numerical study of the impact of impulse noise on asymmetric digital subscriber lines (ADSL). Methods for simulating the effect of impulse disturbances on a discrete multitone system are first presented, and actual measured noise bursts are then used for the simulations as if they were deterministic signals, in order to characterize their effects on ADSL systems. It is sh...