Abstract: A transmission device on the side of subscriber terminals that have been divided into groups multiplexes, on a per-group basis, signals from the subscriber terminals, further time-division multiplexes the multiplexed data in each group and sends the time-division multiplexed data to a transmission device on the side of an exchange switch. The transmission device on the subscriber side senses the traffic states (on-hook/off-hook states) of the subscriber terminals and sends a signal indicative of the sensed states to the transmission device on the switch side.

Abstract: A modifier for resin and rubber of which an active ingredient is a reaction product of a styrene-maleic anhydride copolymer (A) with a poly(alkylene oxide) monoalkyl ether (B), and/or a metal salt thereof, which modifier improves processability and properties of resins or rubbers. For example, the modifier provides resins or rubbers with antistatic properties. It also enhances the dispersibility of additives, e.g., a flame retardant or fillers incorporated in the resin or the rubber, and provides resins or rubbers with, for example, excellent flame retardancy and prevents the additive or the filler from blooming.