Cabling Specifications

This appendix describes cables and cabling guidelines that should be used with the Cisco 1400 series router and contains the following sections:

ATM-25 Cable

The green RJ-45-to-RJ-45 ATM-25 cable connects the Cisco 1401 router through a DSL modem to the ADSL line. This cable must be a Category 3, 4, or 5 unshielded twisted-pair (UTP) cable. The cable that came with your router is Category 5 and is shown in Figure C-1. The signal associated with each pin is described in Table C-1.

Figure C-1: ATM-25 Cable

Pin	Signal
1	RD+
2	RD-
3	Not used
4	Not used
5	Not used
6	Not used
7	TD+
8	TD-

Table C-1: ATM-25 Cable Pinouts

Pin Signal

1

RD+

2

RD-

3

Not used

4

Not used

5

Not used

6

Not used

7

TD+

8

TD-

Note If you want to connect the ATM-25 port to the ATM port on another router, you must supply an RJ-45-to-RJ-45 crossover cable.

ADSL Cable

The purple RJ-11-to-RJ-11 ADSL cable connects the Cisco 1407 and Cisco 1417 routers to the ADSL line. This cable must be a Category 3, 4, or 5 unshielded twisted-pair (UTP) cable. The cable that came with your router is Category 5 and is shown in Figure C-2. Cable pinouts are described in Table C-2. Pins 2 and 5 are used for data.

Figure C-2: ADSL Cable

Pin¹		Pin
2²	<—>	2
3	<—>	3
4	<—>	4
5	<—>	5

Table C-2: ADSL Cable Pinouts

Pin¹ Pin

2²

<—>

2

3

<—>

3

4

<—>

4

5

<—>

5

¹Pins 1 and 6 are not used.
²Pins 2 and 5 are used for data.

POTS Crossover Cable

The purple (with a blue stripe) RJ-11-to-RJ-11 POTS crossover cable connects the Cisco 1407 and Cisco 1417 routers to POTS splitters that use pins 3 and 4 for data. (The Cisco 1417 router uses pins 2 and 5 for data.) This cable can be ordered from Cisco. If you provide your own cable, it must be a Category 3, 4, or 5 unshielded twisted-pair (UTP) cable. The orderable Cisco cable is Category 5 and is shown in Figure C-3. Cable pinouts are described in Table C-3.

Figure C-3: POTS Crossover Cable

Pin¹		Pin
2	<—>	3
3	<—>	2
4	<—>	5
5	<—>	4

Table C-3: POTS Crossover Cable Pinouts

Pin¹ Pin

2

<—>

3

3

<—>

2

4

<—>

5

5

<—>

4

¹Pins 1 and 6 are not used.

ATM Loopback Plug

An ATM loopback plug is used when performing a loopback test on the Cisco 1401 router. The loopback plug is shown in Figure C-4 and plug pinouts are described in Table C-4.

Figure C-4: ATM Loopback Plug

Pin¹	Signal		Pin	Signal
1	RD +	< — >	7	TD +
2	RD -	< — >	8	TD -

Table C-4: ATM Loopback Plug Pinouts

Pin¹ Signal Pin Signal

1

RD +

< — >

7

TD +

2

RD -

< — >

8

TD -

¹Pins 3, 4, 5, and 6 are not used.

Ethernet Cable

This section describes the yellow RJ-45-to-RJ-45 Ethernet cable used to connect the router to your local Ethernet network. This cable is shipped with the router. The signal associated with each pin is described in Table C-5.

RJ-45 Pin¹	Signal	Direction	RJ-45 Pin
1	TX+	—>	1
2	TX-	—>	2
3	RX+	<—	3
6	RX-	<—	6

Table C-5: Straight-Through Ethernet Cable

RJ-45
Pin¹ Signal Direction RJ-45
Pin

1

TX+

—>

1

2

TX-

—>

2

3

RX+

<—

3

6

RX-

<—

6

¹Pins 4, 5, 7, and 8 are not used.

Pinouts

Console Cable

and Adapters

A console cable kit is provided with your router. Use this kit when connecting your router to a PC or terminal.

The console cable kit contains these items:

RJ-45-to-RJ-45 console cable (blue)
RJ-45-to-DB-25 adapter (gray)
RJ-45-to-DB-9 adapter (gray)

Table C-6 describes the wiring for the console port, the console cable, and both adapters. Figure C-5 illustrates how to identify the console cable, which is also referred to as a rollover cable.

	CONSOLE Port (DTE)	RJ-45-to-RJ-45 Console Cable	Adapter	Adapter
Signal	RJ-45 Pin	RJ-45 Pin	DB-9 Pin	DB-25 Pin	Signal
-	1	8	7	4	-
DTR	2	7	4	20	DSR
TxD	3	6	3	2	RxD
GND	4	5	5	7	GND
GND	5	4	5	7	GND
RxD	6	3	2	3	TxD
DSR	7	2	6	6	DTR
-	8	1	8	5	-

Table C-6:

CONSOLE Port (DTE) RJ-45-to-RJ-45 Console Cable Adapter Adapter

Signal RJ-45 Pin RJ-45 Pin DB-9 Pin DB-25 Pin Signal

-

1

8

7

4

-

DTR

2

7

4

20

DSR

TxD

3

6

3

2

RxD

GND

4

5

5

7

GND

GND

5

4

5

7

GND

RxD

6

3

2

3

TxD

DSR

7

2

6

6

DTR

-

8

1

8

5

-

Console Cable and Adapter Pinouts
Figure C-5: Identifying a Rollover Cable

Ethernet Network Cabling Guidelines

Table C-7 describes guidelines to follow when creating Ethernet networks. Exact figures might vary depending on the manufacturer of the network equipment.

Specification	10BaseT
Maximum segment length	100 meters
Maximum number of segments per network	5
Maximum hop count¹	4
Maximum number of nodes per segment	1024
Cable type supported	UTP Category 3, 4, or 5

Table C-7: Ethernet Cabling Guidelines

Specification 10BaseT

Maximum segment length

100 meters

Maximum number of segments per network

5

Maximum hop count¹

4

Maximum number of nodes per segment

1024

Cable type supported

UTP
Category 3, 4, or 5

¹Hop count = Routing metric used to measure the distance between a source and a destination.

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