RJ-21 Cable Pinouts

Table B-1 lists the RJ-21 cable pinouts on the Catalyst 2950ST-24 LRE and Catalyst 2950ST-24 LRE 997 switches.

Table B-1 - Catalyst 2950ST-24 LRE and Catalyst 2950ST-24 LRE 997 Switch RJ-21 Cable Pinouts

Function	Pin	Pin	Function
Port 1 Tip	1	26	Port 1 Ring
Port 2 Tip	2	27	Port 2 Ring
Port 3 Tip	3	28	Port 3 Ring
Port 4 Tip	4	29	Port 4 Ring
Port 5 Tip	5	30	Port 5 Ring
Port 6 Tip	6	31	Port 6 Ring
Port 7 Tip	7	32	Port 7 Ring
Port 8 Tip	8	33	Port 8 Ring
Port 9 Tip	9	34	Port 9 Ring
Port 10 Tip	10	35	Port 10 Ring
Port 11 Tip	11	36	Port 11 Ring
Port 12 Tip	12	37	Port 12 Ring
Port 13 Tip	13	38	Port 13 Ring
Port 14 Tip	14	39	Port 14 Ring
Port 15 Tip	15	40	Port 15 Ring
Port 16 Tip	16	41	Port 16 Ring
Port 17 Tip	17	42	Port 17 Ring
Port 18 Tip	18	43	Port 18 Ring
Port 19 Tip	19	44	Port 19 Ring
Port 20 Tip	20	45	Port 20 Ring
Port 21 Tip	21	46	Port 21 Ring
Port 22 Tip	22	47	Port 22 Ring
Port 23 Tip	23	48	Port 23 Ring
Port 24 Tip	24	49	Port 24 Ring
No connect	25	50	No connect

Table B-2 lists the RJ-21 cable pinouts on the Catalyst 2950ST-8 LRE switches.

Table B-2 - Catalyst 2950ST-8 LRE Switch RJ-21 Cable Pinouts

Function	Pin	Pin	Function
Port 1 Tip	1	26	Port 1 Ring
Port 2 Tip	2	27	Port 2 Ring
Port 3 Tip	3	28	Port 3 Ring
Port 4 Tip	4	29	Port 4 Ring
Port 5 Tip	5	30	Port 5 Ring
Port 6 Tip	6	31	Port 6 Ring
Port 7 Tip	7	32	Port 7 Ring
Port 8 Tip	8	33	Port 8 Ring
No connect	9	34	No connect
No connect	10	35	No connect
No connect	11	36	No connect
No connect	12	37	No connect
No connect	13	38	No connect
No connect	14	39	No connect
No connect	15	40	No connect
No connect	16	41	No connect
No connect	17	42	No connect
No connect	18	43	No connect
No connect	19	44	No connect
No connect	20	45	No connect
No connect	21	46	No connect
No connect	22	47	No connect
No connect	23	48	No connect
No connect	24	49	No connect
No connect	25	50	No connect