Cisco 3800 Port and Trunk Pinouts

This chapter provides pinouts for Cisco 3800 connections, and contains the following sections:

Serial Data Interface Ports

Four DB-25 connectors (see Figure 4-1) provide serial data interface ports with the pinout described in Table 4-1.

Figure 4-1: Four 25-Pin Serial Data Interface Ports

Table 4-1: Serial Data Interface Port Pinouts

Pin	Signal Name	Direction	Description
1	GND	-	Chassis Ground
2	TxDA	In	Transmit Data A
3	RxDA	Out	Receive Data A
4	RTSA	In	Request To Send A
5	CTSA	Out	Clear To Send A
6	DSRA	Out	Data Set Ready A
7	SIG-GROUND	-	Signal Ground
8	DCDA	Out	Carrier Detect A
9	RxCB	Out	Receive Clock B
10	DCDB	Out	Carrier Detect B
11	TTB	In	Terminal Timing B
12	TxCB	Out	Transmit Clock B
13	CTSB	Out	Clear To Send B
14	TxDB	In	Transmit Data B
15	TxCA	Out	Transmit Clock A
16	RxDB	Out	Receive Data B
17	RxCA	Out	Receive Clock A
18	LL	In	Local Loopback
19	RTSB	In	Request To Send B
20	DTRA	In	Data Terminal Ready A
21	RL	In	Remote Loopback
22	DSRB	Out	Data Set Ready B
23	DTRB	In	Request Terminal Ready B
24	TTA	In	Terminal Timing A
25	TM	Out	Test Mode

The RJ-45 connector labeled SRV connects a service and maintenance terminal for configuring the Cisco 3800, optional cards, or an external modem. (See Figure 4-2.) This port has two asynchronous channels: channel 1 is the console port providing direct or dial-in access to the Combo card through an external modem; channel 2 is the debug port used only at the factory. Both channels are DTEs. See Table 4-2 for service and maintenance port pinouts.

Figure 4-2: Service and Maintenance Port

Table 4-2: Service and Maintenance Port Pinouts

Pin	Signal Name	Direction	Description
1	RXD1	In	Receive Data 1
2	CD1	In	Carrier Detect 1
3	DTR1	Out	Data Terminal Ready 1
4	GND	-	Ground
5	GND	-	Ground
6	RXD2	In	Receive Data 2
7	TXD2	Out	Transmit Data 2
8	TXD1	Out	Transmit Data 1

Analog Voice Ports

Two RJ-45 connectors labeled V0 and V1 are analog voice ports. (See Figure 4-3.) They can be configured as E&M, FXS or FXO lines using DIP switches SW1, SW2, and SW3 on the Combo card as described in the chapter "Installing Cisco 3800 Cards." Table 4-3 and Table 4-4 list the pinouts for the setting selected.

Figure 4-3: Analog Voice Ports

Note Voice port pinout configurations are not independently selectable.

Table 4-3: Voice Port Pinouts with E&M Selected

Pin	E&M Signal	Direction
1	SB	Out
2	M	In
3	R	In
4	R1	Out
5	T1	Out
6	T	In
7	E	Out
8	SG	Out

Table 4-4: Voice Port Pinouts with FXS or FXO Selected

Pin	FXS Signal	Direction	FXO Signal	Direction
1	-	-	-	-
2	-	-	-	-
3	-	-	-	-
4	T	I/O(+)	R	I/O(-)
5	R	I/O(-)	T	I/O(+)
6	-	-	-	-
7	-	-	-	-
8	-	-	-	-

T1/E1 Trunk

The DB-15 connector on the daughter card is configured as either a T1 or E1 trunk with SW1 as described in the chapter "Installing Cisco 3800 Cards." The T1/E1 trunk pinout is illustrated in Figure 4-4 and described in Table 4-5.

Figure 4-4: DB-15 T1/E1 Connector Placement on the Daughter Card

Table 4-5: T1/E1 Pinouts for DB-15

Pin	Signal Definition
1	TxTIP	Transmit TIP
2	Tx Signal GND	Transmit Signal Ground
3	RxTIP	Receive TIP
4	Rx Signal GND	Receive Signal Ground
5	-	-
6	-	-
7	-	-
8	-	-
9	Tx RING	Transmit Ring
10	-	-
11	Rx RING	Receive Ring
12	-	-
13	-	-
14	-	-
15	-	-

10BaseT Ethernet Port

The RJ-45 port on the daughter card provides support for a 10BaseT Ethernet connection. The pinout of the port is described in Table 4-6.

Table 4-6: Ethernet RJ-45 Pinouts

Pin	Signal	Direction
1	Tx+	Out
2	Tx-	Out
3	Rx+	In
4	-	-
5	-	-
6	Rx-	In
7	-	-
8	-	-

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