Installation Manual
H3C S7500E Series Ethernet Switches
Chapter 3 Hardware Installation
3-14
3.7.3 Connecting the COM Cable
I. Introduction
When connected to an external PoE power supply, the S7500E series can monitor the
running status of the external PoE power supply through the COM port. The COM ports
(one RS-485 port and one RS-232 port) of the S7502E and the S7503E-S are located
on the rear panel of the chassis.
When the S7503E, S7506E, S7506E-V, or S7510E provides PoE supply through the
PSR1400-D, they can monitor the running status of the PoE supply through the PoE
monitoring port (one RS-485 port) on the PSR1400-D.
II. Connection procedure
The connection procedure of the RS-232 port and that of the RS-485 port are shown
respectively as follows (taking the S7502E using the PSE2500-A3 as an example):
If the RS-232 port is used, use an 8-core shielded cable. One end of the cable is a
crimped RJ-45 connector, which is connected to the RS-232 COM port on the rear
panel of the S7502E; the other end is attached with a DB-9 female connector and can
be connected to the RS-232 port of PSE2500-A3. The COM cable is similar to the
console cable. For details, see Figure 3-14.
If the RS-485 port is used, use a straight through cable to connect the COM port with
the RS-485 port on the PSE2500-A3.
The PoE monitoring port on the PSR1400-D is an RS-485 port. You can select a proper
connection method for the RS-485 port according to the type of the PoE monitoring port
on the external power module.
Note:
When the S7500E series adopt only the –48 V DC power, but no external PoE power
supply, it is unnecessary to connect the COM port.
3.7.4 Connecting Category-5 Cables
I. Introduction to the RJ-45 connector
10Base-T/100Base-TX and 1000Base-T ports of the S7500E series use RJ-45
connectors, support MDI/MDIX auto-sensing, and adopt category-5 cables. The
following figure illustrates the appearance and pinouts of RJ-45 connector.