• Security
DSL and cable, both employ different network security models to ensure safe and protected services. Although, both are successfully able to deliver protected service, majority of populace prefer cable to DSL, considering it to be a more secure option.
DOCSIS and Cable modem
DOCSIS, Data over Cable Service Interface Specification, is a telecommunications standard utilized to deliver internet access through a cable modem. Being a chief element, it provides a common method to network service providers as well as modem manufacturers in order to work jointly in a conventional method. DOCSIS allows quick data transfer to present cable TV system. Majority cable TV operators employ the technology of DOCSIS to render internet access over existing hybrid fiber coaxial infrastructure.
Security features offered by DOCSIS
The Baseline Privacy Interface specifications of DOCSIS comprise of MAC layer security services. Employing these services, BPI/SEC aims at delivering the following:
• Data privacy to cable modem users across the network
• Service protection to cable operators, that is, restricting unauthorized users and modems from acquiring access to network’s MAC services.
The security offered by DOCSIS averts cable users from listening to one another. This is accomplished through data encryption between the cable modem and the CMTS. Besides, cable operators are given the authority to deny service to illegitimate users and uncertified cable modems. The security feature is enhanced through digital service based authentication, which is added to a key exchange protocol by making use of public key infrastructure based on digital certificate authorities. Usually, a cable operator adds the MAC address of a cable modem to a subscriber’s account manually. This ensures that the network enables access to only that cable modem which can confirm to that particular MAC address by the means of a legal certificate issued by Public Key Infrastructure.
DOCSIS security is widely improved over a period of time and this can be said as only the communications crucial for businesses are allowed while communication to network infrastructure is refused.
To sum up, although, a myriad of new technologies are introduced after certain intervals, the service offered by cable is still appreciated. It cannot be ignored that some people prefer advanced technologies to conventional services, but a huge population still considers cable a better alternative.