3Com S26x, S27x, S24x Port Numbers, Slot Number Port Number Associated Card, Serial/Network

Hardware Components

Lithium Battery

Figure 1-9. CMEM SIMM

Expansion Port The PathBuilder S24x, 26x, and 27x switch motherboard has eight full-size

I/O Slotsexpansion card slots (see Figure 1-6). Expansion I/O cards have I/O connectors that extend through the rear panel.

Port numbers for the ports on the I/O cards have a fixed relationship to the chassis expansion slot number. Six port numbers are reserved for each slot. If a slot contains an I/O card that does not support the full port count reserved for that slot, or the slot is empty, the extra port numbers remain unused.

Slot Number and This table shows the port numbers associated with each card type.

Port Numbers

	Slot Number	Port Number	Associated Card
	Motherboard I/O	1-6	Motherboard
	1	7-12	Voice cards (E & M, FXS,
			Server Module, T1, E1).
	2	13-18
			The T1/E1 is restricted to
	3	19-24
			Slot 8.
	4	25-30
	5	31-36
	6	37-42
	7	43-48
	8	49-54
Description of
	Ports 1 through 3 are connected to the motherboard with ribbon cables. Ports 1 and 2
Serial/Network	are DIM ports and are functional only if a DIM is present. Port 3 is a dedicated V.36
Ports	DTE port.

Ports 1, 2, 3, and 6 on the rear panel of the chassis are DB-25 female connectors. Port 4, (the Ethernet AUI port) uses a DB-15 connector. Ports 1 and 2 may require adapters, depending on the DIM used. An adapter cable is available for Port 3.

1-14 About the PathBuilder S24x, 26x, and 27x switch