Reach PoE4N Tester Manual 1.4
08/09/2017
Page 7
3.
Configuration Guide
3.1.
Power
The power input is located on the rear of the unit. The power supply provided is a
"desktop" type brick with a three prong IEC input connector. An AC power cord
compatible with U.S. power outlets is optional. There is no power switch; it is on when
the power is applied.
3.2.
Serial Console
The serial console port is located at the rear of the unit. It is an RJ-45 with a three-wire
RS-232 level interface. The interface has the same pinout as found on Cisco routers and
switches. The baud rate factory default is 9600, 1 stop, no parity, 8 bits. The baud rate
can be changed by software command – see the
BAUD
command in the Command
Reference section. Characters are echoed as they are typed (full duplex).
RJ-45 Connector:
Pin
Signal (DTE name)
1
**
2
**
3
RS232 data output (TxD)
4
Ground
5
Ground
6
RS232 data input (RxD)
7
**
8
**
** these signals are connected to each other
3.3.
UUT (Unit Under Test) Connections
The RT-PoE4N has twenty-four identical test ports. Connect the port of the PSE (PoE
Supplying Equipment) under test to the port connector via a standard straight through
Ethernet cable. The PSE data will be routed to the next port (1 to 2, 3 to 4, etc) on a
straight-through, non-crossover basis. There is a UPoE, GbE rated 802.3at class
transformer isolating the PoE4N RJ45 so that power can be tapped from the PSE while
data is passed on. All data path connections are made via signal relays and 100 ohm
differential pairs for data integrity.
NOTE: with high power loads, the DC balance of the patch cables used is important to
avoid DC saturation of the Ethernet transformers. DC Balance (DC resistance per side
of the power carrying pair) should be within 3%. The standard patch cable
specifications of Cat 5, 5e, and 6 do not specify DC balance.
