Serial Adapters / Smart Serial Adapters  
1 2 3 4 5 6

V.35 18-pin (F) / DB25 (F)
V.35 18-pin (F) / DB25 (M)
V.35 34-pin (F-F)
V.35 18-pin (M) / DB25 (F)
V.35 20-pin (M) / DB25 (M)
V.35 34-pin (M-M)
7 8 9 10 11 12
           
13 14 15 16 17 18
           
19 20 21 22 23 24
         
Note(s):
  • V.35 is the interface standard used by most routers and DSUs that connect to T-1 carriers. V.35 is recognized by a blocky 34-pin (M-Block) connector that combines the bandwidth of numerous telephone circuits to provide a high-speed interface between DTE's (Data Terminal Equipment) or DCE's (Data Communication Equipment) over digital lines.