Troubleshooting guide

MX2820 System Manual
2-6 61186003L1-1D
Table 2-6 provides the current draw for a fully loaded STS-1 system at –48 VDC for a single
19-inch shelf and a single 23-inch shelf deployment.
Note: x indicates the list version.
Wire Gauge and Fuse Size
Table 2-7 provides data for determining the wire gauge and fuse size for a fuse panel and
MX2820 shelf in the same bay. The recommendations apply to wiring from the shelf to a fuse
panel in the same bay.
Table 2-6. Current Draw at –48 VDC for fully loaded STS-1 system
Part Number Description Quantity Current Draw Quantity
times Draw
Total Draw
19-inch shelf
1186003Lx SCU 1 68 mA 1 × 68 mA 68 mA
1186004L1 Clock Module 2 52 mA 2 × 52 mA 104 mA
1186005L1 STS-1 MUX 7 redundant pairs 332 mA 7 × 332 mA 2.33 A
Total Draw in amps 2.5
23-inch shelf
1186003Lx SCU 1 68 mA 1 × 68 mA 68 mA
1186004L1 Clock Module 2 52 mA 2 × 52 mA 104 mA
1186005L1 STS-1 MUX 9 redundant pairs 332 mA 9 × 332 mA 2.99 A
Total Draw in amps 3.16 A
Table 2-7. Wire Gauge and Fuse Size Recommendations
System Voltage Recommended Wire Gauge Recommended Fuse Size
–48 VDC System 14 AWG 8 amps
±24 VDC System 12 AWG 16 amps