Practice Quiz in Wire and Wireless Communications System Part 47

Question 461. Group 3 fax used which modulation?

Question 462. The communications between two or three central offices is called

Question 463. The location where individual cable pairs within a distribution cable are separated and extended to the subscriber’s location on a drop wire.

Question 464. It is the actual time required for a particular frequency to propagate from a source to a destination through a communications channel.

Question 465. A the receiver, the phase difference at the different carrier frequencies is called _________.

Question 466. Type of Class 4 toll center usually had only outward operator service or perhaps no operator service at all.

Question 467. The trunk circuits that are terminated in tandem switches are called

Question 468. It is a special balanced transformer used to convert a two-wire circuit into a four-wire circuit and vice-versa.

Question 469. Modern paging system uses what modulation technique?

Question 470. Stage of the step-by-step switching system that is composed of switches to complete the connection to the called subscriber.