The LRE port uses a single 50-pin RJ-21 connector, as shown in Figure B-3. Each LRE port uses two pins. Because the Catalyst 2950ST-24 LRE and Catalyst 2950ST-24 LRE 997 switches use 48 pins, pin 25 on the top row and pin 50 on the bottom row are not used.

The Catalyst 2950ST-8 LRE switch uses 16 pins. Pins 9 through 25 on the top row and pins 34 through 50 on the bottom row are not used.

Figure B-3 - RJ-21 Connector