Enterasys Networks A2H124-24P manual Connecting Stacking Cables, Fastening the Switch to the Rack

Connecting Stacking Cables

2.With the mounting brackets attached, position the switch between the vertical frame members of the 19‐inch rack as shown in Figure 3‐4. Then fasten the switch securely to the frame using four mounting screws (user supplied).

Figure 3-4 Fastening the Switch to the Rack

A2H124-24P

												1	1	2	3	4	5	6	7	8	9	10	11	12	11	13 13	14	15	16	17	18	19	20	21	22	23	24 23
Console																																					25	25/Up	26/Down
																																					26		27	28
CPU	1	3	5	7	9	11	13	15	17	19	21	23
MGR																																					27
RPS	2	4	6	8	10	12	14	16	18	20	22	24																									28
												2													12	14											24		Stack

Á	Á
À		À
1 Rails of 19-inch rack	2 Mounting screws (supplied by user)

3.If you are installing this switch in a stacked configuration, repeat this procedure for each switch until all switches have been installed in the stack, then proceed to “Connecting Stacking Cables” on page 3‐7. Otherwise, proceed to “Connecting AC and PoE Power” on page 3‐12.

Connecting Stacking Cables

The stack of switches can be connected in a closed loop or daisy chained. In a closed loop all the switches are connected in sequence and the last switch in the stack is connected back to the first switch. In the daisy chain configuration the cable that would return the connection back to the first switch in a closed loop is not installed. The advantage of the closed loop is redundancy, this configuration eliminates any single point of failure. Up to eight switches can be stacked together and connected by standard UTP Category 5 or better cables. You can add switches and reach up to a maximum of 384 fixed front panel ports and 16 SFP ports for a total of 400 Ethernet ports per stack. The stacking cables allow the entire stack to operate with a single IP address.

Figure 3‐5 shows an example of a four‐high stack connected in a closed loop configuration. All STACK DOWN and STACK UP connectors are used in the installation. The stacking cable connections are from the STACK DOWN connector of one switch to the STACK UP connector of the next switch up in the stack. A stacking cable connection from the STACK DOWN connector of the switch at the top of the stack to the STACK UP connector at the bottom of the stack closes the loop. In a daisy chain topology, one cable connection is not made.

SecureStack A2 PoE Installation Guide 3-7