Catalyst 3850 Switch Hardware Installation Guide
Connector and Cable Specifications
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Connector and Cable Specifications

Connector and Cable Specifications

Connector Specifications

10/100/1000 Ports (Including PoE)

All 10/100/1000 ports use standard RJ-45 connectors and Ethernet pinouts.

Figure 1. 10/100/1000 Port Pinouts

SFP Module Connectors

Figure 2. Duplex LC Cable Connector



Figure 3. Simplex LC Cable Connector

Figure 4. Copper SFP Module LC Connector

Figure 5. SFP Module Patch Cable

Console Port

The switch has two console ports: a USB 5-pin mini-Type B port on the front panel and an RJ-45 console port on the rear panel.

Figure 6. USB Mini-Type B Port



The USB console port uses a USB Type A to 5-pin mini-Type B cable. The USB Type A-to-USB mini-Type B cable is not supplied. You can order an accessory kit (part number 800-33434) that contains this cable.

Figure 7. USB Type A-to-USB 5-Pin Mini-Type B Cable

The RJ-45 console port uses an 8-pin RJ-45 connection. The supplied RJ-45-to-DB-9 adapter cable is used to connect the console port of the switch to a console PC. You need to provide a RJ-45-to-DB-25 female DTE adapter if you want to connect the switch console port to a terminal. You can order a kit (part number ACS-DSBUASYN=) containing that adapter.

Cables and Adapters

StackWise Cables

You can order these Catalyst 3850 to Catalyst 3850 StackWise cables (nonhalogen) from your Cisco sales representative:

  • STACK-T1-50CM= (0.5-meter cable)
  • STACK-T1-1M= (1-meter cable)
  • STACK-T1-3M= (3-meter cable)

SFP Module Cables

For cabling specifications, refer to the Cisco SFP and SFP+ Transceiver Module Installation Notes.

Each port must match the wave-length specifications on the other end of the cable, and the cable must not exceed the stipulated cable length. Copper 1000BASE-T SFP module transceivers use standard four twisted-pair, Category 5 cable at lengths up to 328 feet (100 meters).

Cable Pinouts

Figure 8. Four Twisted-Pair Straight-Through Cable Schematic

Figure 9. Four Twisted-Pair Semi-Cross Cable Schematic

Figure 10. Two Twisted-Pair Straight-Through Cable Schematic

Figure 11. Two Twisted-Pair Crossover Cable Schematic

Identifying a Crossover Cable

To identify a crossover cable, compare the two modular ends of the cable. Hold the cable ends side-by-side, with the tab at the back. The wire connected to the pin on the outside of the left plug should be a different color from the wire connected to the pin on the inside of the right plug.
Figure 12. Identifying a Crossover Cable

Console Port Adapter Pinouts

The RS-232 console port uses an 8-pin RJ-45 connector. Use an RJ-45-to-DB-9 adapter cable to connect the switch console port to a console PC. You need to provide a RJ-45-to-DB-25 female DTE adapter to connect the switch console port to a terminal. You can order the kit (part number ACS-DSBUASYN=) from Cisco.

Table 1 Console Port Signaling with a DB-9 Adapter

Switch Console 
Port (DTE)

RJ-45-to-DB-9
Terminal Adapter

Console
Device

Signal

DB-9 Pin

Signal

RTS

8

CTS

DTR

6

DSR

TxD

2

RxD

GND

5

GND

GND

5

GND

RxD

3

TxD

DSR

4

DTR

CTS

7

RTS

Table 2 Console Port Signaling with a DB-25 Adapter

Switch Console
Port (DTE)

RJ-45-to-DB-25
Terminal Adapter

Console
Device

Signal

DB-25 Pin

Signal

RTS

5

CTS

DTR

6

DSR

TxD

3

RxD

GND

7

GND

GND

7

GND

RxD

2

TxD

DSR

20

DTR

CTS

4

RTS