42 GE INFORMATION D20MX HARDWARE USER’S MANUAL
CHAPTER 3: CONNECTING TO DEVICES AND NETWORKS
Figure 15: D20MX front panel with front access fiber optic connectors 
Figure 16: D20MX front panel and fiber optic card with rear access fiber optic 
connectors 
General cabling requirements
Table 14 lists the cables required to connect to the D20MX:
Table 14: Connection cables
Fiber 
Optic 
Port 1
Fiber 
Optic 
Port 2
RS232 
Serial Port
Operational 
Status LEDs
USB Port
(not 
supported)
Port 
Status 
LEDs
Fiber 
Optic 
Port 2
Fiber 
Optic 
Port 1
RS232 
Serial Port
Operational 
Status LEDs
USB Port
(not 
supported)
Fiber Optic 
Port Status 
LEDs
Fiber Optic card, 
D20 chassis back view
D20MX front panel
Media Designation Cabling Connector
Serial
RS-232 Shielded DB-9 female
D.20 Link RS-485 
2 wire
Shielded DB-9 female
Twisted Pair Ethernet
(GE part number 526-3001 only)
10/100/1000BASE-T UTP (Unshielded Twisted 
Pair) – CAT 5 or better
RJ-45
Fiber optic
(GE part number 526-3003 and 
526-3005LF only)
100BASE-FX 1300 nm, 50/125 μm and 
62.5/125 μm multimode 
duplex fiber cable
ST-style 
connectors