HP J9981A Installation And Getting Started Guide

A-9
Specifications
Twisted-Pair Cable/Connector Pin-Outs
Straight-through Twisted-Pair Cable for
10 Mbps or 100 Mbps Network Connections
Because of the Auto-MDIX operation of the 10/100 ports on the switch, for all
network connections, to PCs, servers or other end nodes, or to hubs or other
switches, you can use straight-through cables.
If any of these ports are given a fixed configuration, for example 100 Mbps/
Full Duplex, the ports operate as MDI-X ports, and straight-through cables
must be then used for connections to PC NICs and other MDI ports.
Cable Diagram
Note Pins 1 and 2 on connector “A” must be wired as a twisted pair to pins 1 and 2
on connector “B”.
Pins 3 and 6 on connector “A” must be wired as a twisted pair to pins 3 and 6
on connector “B”.
Pins 4, 5, 7, and 8 are not used in this application, although they may be wired
in the cable.
.
Pin Assignments
Switch End (MDI-X) Computer, Transceiver, or
Other End
Signal Pins Pins Signal
receive +
receive -
transmit +
transmit -
1
2
3
6
1
2
3
6
transmit +
transmit -
receive +
receive -

HP J9981A Specifications

General

Management	Managed
PoE	No
Jumbo Frame Support	Yes
Form Factor	Rack-mountable
Model	J9981A
Layer	Layer 2
Weight	2.5 kg
MAC Address Table Size	16, 000 entries
Power Supply	Internal
Operating Temperature	0°C to 40°C
Ports	24 x 10/100/1000BASE-T ports 4 x SFP+ ports
Humidity	15% to 95% non-condensing