3Com S24x, S27x, S26x installation manual Cable Description Function

Hardware Components

Slot Restriction	The T1 dual port digital PBX interface card occupies slot 8 in the PathBuilder S24x,
	26x, and 27x switch chassis.
DIP Switch
	The T1 dual port digital PBX interface card contains a single DIP switch bank (SW1)
Location	used to assign the card’s I/O base address.
DIP Switch
	Set the DIP switches on the T1 dual port digital PBX interface card as shown in
Settings	Figure 1-11.
T1/CSU Daughter
	The T1/CSU Daughtercard provides a 1.544 MHz point-to-point interface for North
Card	American service that conforms to AT&T 62411/62421 standard. The card is FCC
	Part 68 Registered and uses eternal clocking derived from the telephone network.
	One or two T1/CSU Daughter Cards can be installed onto the T1 Dual Port card. The
	top card supports port 49 and the bottom supports port 50.
	For instructions for installing the T1/CSU card, refer to “Installing the T1/CSU
	Daughter Card” section in Chapter 3.
Required Cables
	These cables ship with the T1 dual port digital PBX interface card and are required to
	cable the T1 dual port digital PBX interface card to the DSPM/SM cards in the node.
	Cable Description	Function
	One 4-position 40-pin	Connects up to 3 DSPM/SM cards to interconnect
	MVIP ribbon cable	digital voice traffic between individual cards in the
		same PathBuilder S24x, 26x, and 27x switch node.
	One 8-position 40-pin	Connects 4 or more DSPM/SM cards to interconnect
	MVIP ribbon cable	digital voice traffic between individual cards in the
		same PathBuilder S24x, 26x, and 27x switch node.
	Two 8-pin modular to	3-ft adapter converter cables used to convert the
	DB15 cables	8-pin modular connector on the front of the T1/E1
		card to a DB15 connector (Product Code 17269).

1-18 About the PathBuilder S24x, 26x, and 27x switch