41. The major difference between the two is P-25 is expected to work jointly with existing analog systems . 42. The analog system , installed more than 45 years ago by the German firm Siemens, is beyond repair. 43. Other analog systems also failed to convince at least 80 per cent of their subscribers about fraud protection. 44. "We have transferred from analog technology _ analog systems _ to digital systems and packet switching, " said Torrez. 45. The Air Force had upgraded the tactical communications equipment from old analog systems to newer, more reliable digital systems. 46. Centertel became Poland's first and only mobile phone operator after winning a license for an analog system in 1991. 47. Distortion in digital systems increases as signal levels decrease, which is the opposite of the behavior of analog systems . 48. Little did I know, however, that the Achilles'heel of today's digital wireless networks is their dependence on older analog systems . 49. Cellular One and GTE customers can use their phones with the old analog systems in areas to which they travel. 50. Digital television can offer viewers clearer images and a broader range of programs and other services than current analog systems .
