J4889A 48-Port Telco Forwarding Module - HP ProCurve 9304M Installation And Configuration Manual

Figure B.4 Crossover pin assignment and signalling for 10/100BaseTX ports
Pin Assignment
8
1

J4889A 48-Port Telco Forwarding Module

Figure B.5 shows the front panel of an EP 10/100 RJ-21 forwarding module. This module occupies one chassis
slot.
Figure B.5 J4889A EP 10/100 forwarding module
1
RJ-21 Interfaces
The EP Telco module provides four 50-pin connectors for attaching to 48 10/100 Ethernet segments. The
connectors use the RJ-21 wiring standard, which uses four wires for each network segment. Each connector
supports 12 segments. Figure B.6 shows an example of a Telco serial cable.
Figure B.6 RJ-21 Telco serial cable
Pin 1
Pin 26
To connect the EP module to the network, you can use a cable that terminates in another 50-pin connector or one
that terminates in 12 RJ-45 connectors, depending on the patch panel you are using.
NOTE: HP does not provide the cables or patch panels. However, you can order cables and patch panels from
Superior Module Products, www.superiormod.com.
10BaseT
Pin Number MDI-X ports
1 RD+
2
RD-
3
TD+
1
4
Not used
5 Not used
6 TD-
8
7 Not used
8 Not used
12 13 24 25
Pin 25
Pin 50
Enhanced Performance (EP) Chassis Modules
100BaseTX and 1000BaseT
Pin Number MDI-X ports
1 RD+
2
RD­
3
TD+
4
CMT
5 CMT
6 TD­
7 CMT
8 CMT
36 37 48
B - 5