9-128 Jills al §-1264 9-125 ol & -|-| |. s) 352 dsl a S| = 2 S| e |] & 33 0-108A 3ds| ob)3) 9)en =e Al Nw - 9-113 {-| 71164, = +i21hs : 1-1128 4-119 —uf 471 3-118 1-112 (ati(ti 218¢t = ES wi @ ws WwW “SS woud a aoa ua tad tad tad tad lated babel =EES B88 zzz =z a wT a ON 9 a ot ot -~y #4 @BF Telephone System Block Diagram 5-243 FIGURE 5.17-1 _5-427+ | _O-108A4 | |