Abstract: Discussed is a battery that may include at least one battery module including at least one battery cell, a case tray configured to support the at least one battery module, a case cover coupled with the case tray to cover the at least one battery module, a sealing gasket disposed between the case tray and the case cover to prevent penetration of moisture or foreign substance into the at least one battery module, and a reinforcing unit provided to the case cover to be disposed adjacent to the sealing gasket and configured to prevent twisting of the case cover when the case tray and the case cover are coupled.

Abstract: Discussed is a battery pack that may include at least one battery module including at least one battery cell; a case tray configured to support the at least one battery module; a tray cover coupled to the case tray; and at least one bushing gasket configured to connect the case tray and the tray cover and to support the case tray on a plurality of points.

Abstract: A telephone service system in an ATM private network, includes: a PSTN interface unit for performing PCM with an analog telephone signal transmitted from a channel in a PSTN, converting the modulated data into a CEPT frame before sending it to a subscriber, performing the PCM with CEPT frame data, from a subscriber, and converting the modulated data into an analog telephone signal, before forwarding it to the PSTN; a first ATM cell processing unit for converting the CEPT frame data from the PSTN interface unit into an ATM cell, converting an ATM cell from a subscriber into CEPT frame data, and sending it to the PSTN interface unit; an ATM switching unit for switching the ATM cell from the first ATM processing unit to the subscriber, and switching the ATM cell from the subscriber to the PSTN; a second ATM processing unit for converting the ATM cell from the ATM switching unit into CEPT frame data before sending it to the subscriber, and converting the CEPT frame data from the subscriber into an ATM cell before