3Com S24x, S27x, S26x installation manual Motherboard, Parts, Ports

Hardware Components

Motherboard

Parts of the	This section describes some of the components that make up the PathBuilder S24x,
Motherboard	26x, and 27x switch motherboard. In addition, this section describes some of the
	daughtercards that can be found on the motherboard, shown in Figure 1-7.

Power Supply	DRAM SIMM
Ringer Status	Slots 1 and 2

Port 1

Port 2

Port 3

Etherspan

AUI

Port 4

Port 6

1

2

3

4

5

6

7 8

Flash SIMM Slot

Optional Flash

SIMM Slot

CMEM SIMM Slot

Data Compression

SIMM Slot

Global DRAM

SIMM Slot

LED Connector

Port 1

DIMs

Port 2

	Switch 2 Switch 1
	Figure 1-7. Motherboard
RAM
	The PathBuilder S24x, 26x, and 27x switch comes standard with 16 Mbytes of local
	DRAM for image execution and 8 Mbytes of global memory for buffer storage.
Ports
	There are four serial data port DB-25 connectors for network or access functions
	(2.048 Mbps):

• Ports 1 and 2 (DB 25) are Data Interface Module (DIM) ports

• Port 3 (DB 25) is a V.36 DTE port

• Port 4 (DB 15) is an Ethernet AUI port

• Port 6 (DB25) is the Control Terminal Port (EIA232)

1-12 About the PathBuilder S24x, 26x, and 27x switch