双返回模式:在双返回模式下，启用多路复用器，电路的功能分成2个，即连接在.-起的每个接收器1发送器对拆解和重构他们各自的信号。差分曼彻斯特码数据进入差分曼彻斯特码接收器模块，接着又回到差分曼彻斯特码发送器模块。同样,G.703数据进入G.703接收器模块，接着被传送到G.703发送器模块而可作为G.703数据返回。
HONEYWELL INPUT MODULE 621-3560R SEALED 6213560R
YAMATAKE HONEYWELL UAC I/F CARD 82408440-001 BOARD 82408440001
Honeywell 620-3590 IPC 620-35 Processor Rack 6203590
HONEYWELL 621-3560R INPUT MODULE 6213560R NIB FS
HONEYWELL ISSC 620-3033 PROCESSOR 3203033 REPAIRED
Honeywell Processor Rack 620-3590 #11438
1 HONEYWELL 82407387-001 PC BOARD N2-3
Honeywell/Micro Switch FE-MLS5EB Photoelectric FEMLS5EB Micoswitch
Honeywell XL50-MMI Controller () Care, XBS
HONEYWELL 14504670-001 BOARD
HONEYWELL BOARD 14504670-001 , 14504670
