31. "There is now a seamless network, " said Janet Boudris, senior vice president for strategic marketing for BellSouth's wireless data unit . 32. Each PDU contains a payload, called the service data unit ( SDU ), along with protocol-related headers and / or footers. 33. Harris said investigators do not know whether the cockpit voice recorder was powered by the same circuit that served the flight-data unit . 34. Between the layers ( and between the application and the top-most layer ), the layers pass service data units across the interfaces. 35. The investment increases pressure on the company to improve the performance of its Telerate financial news and data unit and its stock. 36. This technical department became known as the Engineering Sciences Data Unit ( ESDU ) and eventually became a separate entity in the 1980s. 37. The wireless data unit will be part of the new company being created by combining the wireless businesses of BellSouth and SBC Communications. 38. However, TCP does not respect message boundaries; it sends data as a sequence of bytes without regard to protocol data units ( PDU ). 39. Calls made to Flight 370's cockpit at 02 : 39 and 07 : 13 were unanswered but acknowledged by the aircraft's satellite data unit . 40. Bull's investment consists of folding the Zenith Data unit into the merged company, valuing Zenith at more than $ 367 million, the companies said.
