Cable Specifications and Information

This appendix provides the connector and pinout information you need for making or purchasing cables used with the Cisco VG310 and the Cisco VG320 voice gateways. To order cables from Cisco, see Obtaining Technical Assistance.

This appendix contains the following sections:

Console and Auxiliary Port Signals and Pinouts

Cisco VG310 and Cisco VG320 come with the cable and adapters you need to connect a PC, an ASCII terminal, or a modem to your Cisco VG310 or Cisco VG320.

The cable kit includes:

  • RJ-45-to-RJ-45 rollover cable

  • RJ-45-to-DB-9 adapter cable for console connection

  • DB-9-to-DB-25 adapter cable for modem connection

The console port is configured as data communications equipment (DCE), and the auxiliary port is configured as data terminal equipment (DTE). Both are asynchronous serial ports and use RJ-45 connectors.

Console Port Signals and Pinouts

Use the thin, flat, RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-9 female DTE adapter (labeled TERMINAL) to connect the console port to a PC-running terminal-emulation software. Figure 20 shows how to connect the console port to a PC. The following table lists the pinouts for the asynchronous serial console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-9 female DTE adapter (labeled TERMINAL).

Table 1. Console Port Signaling and Cabling Using a DB-9 Adapter

Console Port (DTE)

RJ-45-to-RJ-45 Rollover Cable

RJ-45-to-DB-9 Console Device Terminal Adapter (connected to Rollover Cable)

Console Device

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

RTS

11

8

8

CTS

DTR

2

7

6

DSR

TXD

3

6

2

RXD

GND

4

5

5

GND

GND

5

4

5

GND

RXD

6

3

3

TXD

DSR

7

2

4

DTR

CTS

8

1

7

RTS

1 Pin 1 is connected internally to pin 8.

The following table lists the pinouts for the asynchronous serial console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 female DTE adapter (labeled TERMINAL).

Table 2. Console Port Signaling and Cabling Using a DB-25 Adapter

Console Port (DTE)

RJ-45-to-RJ-45 Rollover Cable

RJ-45-to-DB-25 Terminal Adapter

Console Device

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

RTS

11

8

5

CTS

DTR

2

7

6

DSR

TXD

3

6

3

RXD

GND

4

5

7

GND

GND

5

4

7

GND

RXD

6

3

2

TXD

DSR

7

2

20

DTR

CTS

8 2

1

4

RTS

1 You can use the same cabling to connect a console to the auxiliary port.

2 Pin 1 is connected internally to pin 8.

Auxiliary Port Signals and Pinouts

The following table lists the pinouts for the asynchronous serial auxiliary port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 male DCE adapter (labeled MODEM).

Table 3. Auxiliary Port Signaling and Cabling Using a DB-25 Adapter

Auxiliary Port (DTE)

RJ-45-to-RJ-45 Rollover Cable

RJ-45-to-DB-25 Modem Adapter

Modem

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

RTS

11

8

4

RTS

DTR

2

7

20

DTR

TXD

3

6

2

TXD

GND

4

5

7

GND

GND

5

4

7

GND

RXD

6

3

3

RXD

DSR

7

2

8

DCD

CTS

8 1

1

5

CTS

1 Pin 1 is connected internally to pin 8.

Identifying a Rollover Cable

You can identify a rollover cable by holding the plugs side by side, with the tab at the back, and comparing the modular plugs at the two ends of the cable. The wire connected to the pin on the outside of the left plug should be the same color as the wire connected to the pin on the outside of the right plug. (Figure 20.)

If your cable is from Cisco Systems, pin 1 is white on one plug, and pin 8 is white on the opposite plug.

Figure 1. Identifying a Rollover Cable

Note
Pin 1 and pin 8 are of the same color.

Note
A rollover cable reverses the wire connections at the opposite ends: 1 to 8, 2 to 7, 3 to 6, 4 to 5, 5 to 4, 6 to 3, 7 to 2, and 8 to 1.

Console Port to ASCII Terminal

The following figure shows the RJ-45-to-RJ-45 rollover cable assembly and the RJ-45-to-DB-25 female DTE adapter (labeled TERMINAL).

Figure 2. Console Port to ASCII Terminal—Cable and Adapter

The following table lists the pinouts.

Table 4. Console Port to ASCII Terminal—Cable Pinouts (RJ-45 to DB-25)

Console Port

(DCE, RJ-45)

RJ-45-to-RJ-45

Rollover Cable

RJ-45-to-DB-9

Adapter “TERMINAL”

PC Port

(DTE, DB-9)

Signal

RJ-45 Pin

RJ-45 Pin

RJ-45 Pin

DB-9 Pin

Signal

RTS

11

8

8

5

CTS

DTR

2

7

7

6

DSR

TxD

3

6

6

3

RxD

GND

4

5

5

7

GND

GND

5

4

4

7

GND

RxD

6

3

3

2

TxD

DSR

7

2

2

20

DTR

CTS

81

1

1

4

RTS

1 Pin 1 is connected to pin 8 inside the Cisco VG310 or Cisco VG320.

Gigabit Ethernet Connector Pinouts (RJ-45)

The following figure shows the Gigabit Ethernet RJ-45 connector for the Gigabit Ethernet cable.


Note

The RJ-45 ports are capable of operating in both 100BASE-T and 1000BASE-T modes.

Figure 3. RJ-45 Connector and Port

The following table lists the pinouts.

Table 5. Gigabit Ethernet Connector Pinouts (RJ-45)

Pin 1

FE Signal

GE Signal

1

TX data+

TX A+

2

TX data-

TX A-

3

RX data+

RX B+

4

Not used

TX C+

5

Not used

TX C-

6

RX data–

RX B–

7

Not used

RX D+

8

Not used

RX D–

ISDN BRI Interface

This section contains the following topics:


Warning
Network hazardous voltages are present in the BRI, fractional T1/T1, and switched 56 cables. If you detach the cable, detach the end away from the router first to avoid possible electric shock. Network hazardous voltages also are present on the system card in the area of the BRI port (RJ-45 connector), fractional T1/T1 port (RJ-48C connector), and switched port (RJ-11 or RJ-48S connector), regardless of when power is turned OFF. Statement 59

ISDN BRI Connections


Warning
The ISDN connection is regarded as a source of voltage that should be inaccessible to user contact. Do not attempt to tamper with or open any public telephone operator (PTO)-provided equipment or connection hardware. Any hardwired connection (other than by a nonremovable, connect-one-time-only plug) must be made only by PTO staff or suitably trained engineers. Statement 23

BRI WAN interface cards provide ISDN BRI connections. The BRI modules and BRI WAN interface cards are available with either an S/T interface that requires an external Network Terminator 1 (NT1), or a U interface that has a built-in NT1.

Use a BRI cable (not included with...) to connect BRI ports on WAN interface cards (WICs) or on high-speed WICs (HWICs) directly to an ISDN.


Warning
Hazardous network voltages are present in WAN ports regardless of whether power to the unit is OFF or ON. To avoid electric shock, use caution when working near WAN ports. When detaching cables, detach the end away from the unit first. Statement 1026

Use a BRI cable (not included) to connect the BRI WAN interface card directly to an ISDN. The following table lists the specifications for ISDN BRI cables.

Table 6. ISDN BRI Cable Specifications

Specification

High-Capacitance Cable

Low-Capacitance Cable

Resistance (at 96 kHz)

160 ohm/km

160 ohm/km

Capacitance (at 1 kHz)

120 nF/km

Note 
nF= nano Farad

30 nF/km

Impedance (at 96 kHz)

75 ohm

150 ohm

Wire diameter

0.024 in. (0.6 mm)

0.024 in. (0.6 mm)

Distance limitation

32.8 ft (10 m)

32.8 ft (10 m)

ISDN BRI Pinouts


Caution

To prevent damage to the system, ensure that you connect the BRI cable only to the BRI connector and not any other RJ-45 connector. Also, make certain that you connect the E&M cable to an E&M connector only.

The following table lists the connector signals and pinouts for an ISDN BRI S/T port.

Table 7. ISDN BRI S/T Port Signals and Pinouts (RJ-45)

8-Pin1

TE2

NT3

Polarity

3

TX

RX

+

4

RX

TX

+

5

RX

TX

–

6

TX

RX

–

The following table lists the connector signals and pinouts for ISDN BRI U Port Signals and Pinouts (RJ-45).

Table 8. ISDN BRI U Port Signals and Pinouts (RJ-45)

8-Pin1

Function

3

No connection

4

Signal—Tip or Ring

5

Signal—Tip or Ring

E&M Pinouts

The following table lists the connector signals and pinouts for an E&M port

Table 9. E&M Pinouts

Pin

Signal

Description

Two-Wire Operation, Type

Four-Wire Operation, Type

1

2

3

4

1

2

3

4

1

SM

-48V signaling battery

—

SB

—

—

—

SB

SB

—

2

M-lead

Signaling input

M

M

M

M

M

M

M

M

3

R

Ring, audio input

—

—

—

—

R

R

R

R

4

R or R1

Ring, audio input/output or output

R

R

R

R

R1

R1

R1

R1

8

T or T1

Tip, audio input/output or output

T

T

T

T

T1

T1

T1

T1

6

T

Tip, audio input

—

—

—

—

T

T

T

T

7

E-lead

Signaling output

E

E

E

E

E

E

E

E

8

SG

Signaling ground return

—

SG

SG

—

—

SG

SG

—

Analog Voice RJ-21 Pinouts

The following figure shows RJ-21 connector wiring for a 50-pin Amphenol cable.

Figure 4. RJ-21 Connector Wiring

The following table lists the pinouts for the RJ-21 connector.

Table 10. Pinouts for FXS and FXO Voice Ports

Pair

Ring Conductor

Tip Conductor

1

1

26

2

2

27

3

3

28

4

4

29

5

5

30

6

6

31

7

7

32

8

8

33

9

9

34

10

10

35

11

11

36

12

12

37

13

13

38

14

14

39

15

15

40

16

16

41

17

17

42

18

18

43

19

19

44

20

20

45

21

21

46

22

22

47

23

23

48

24

24

49

Serial Connection Signals and Pinouts

This section provides information about the 1-port serial WAN interface card (WIC). With the appropriate serial transition cable, this WIC can provide an EIA/TIA-232, EIA/TIA-449, V.35, X.21, DTE/DCE, EIA-530 DTE, or NRZ/NRZI serial interface.

Types of Serial Cables

Five types of serial cables (also called serial adapter cables or serial transition cables) are available from Cisco Systems:

All serial cables provide a universal plug at the WIC end. The network end of each cable provides the physical connectors most commonly used for the interface. For example, the network end of the EIA/TIA-232 serial cable is a DB-25 connector, the most widely used EIA/TIA-232 connector.

All serial interface types except EIA-530 are available in DTE or DCE format: DTE with a plug connector (male) at the network end and DCE with a receptacle (female) at the network end. V.35 is available in either mode with either gender at the network end. EIA-530 is available in DTE only.

Connecting the WIC to the Network

The serial WIC uses a universal high-density, 60-pin receptacle. Each universal port requires a serial port adapter cable that determines the port’s electrical interface type and mode: DTE or DCE. Although all port adapter cables use a universal plug at the serial module end, the network end of each cable type uses the physical connectors commonly used for the interface. For example, the network end of the EIA/TIA-232 port adapter cable is a DB-25 connector, the most widely used EIA/TIA-232 connector.

After you install the serial WIC, use the appropriate serial cable to connect the WIC DB-60 serial port to one of the following types of equipment:

  • An asynchronous modem if connecting to an analog telephone line.

  • A synchronous modem data service unit/channel service unit (DSU/CSU), or other data circuit-terminating equipment (DCE), if connecting to a digital WAN line.

EIA/TIA-232 Connections

The EIA/TIA-232 standard supports unbalanced circuits at signal speeds up to 64 kbps.

For connection to a Cisco VG310 or Cisco VG320 serial port, use the EIA/TIA-232 serial transition cable with the Cisco 12-in-1 connector on one end and a DB-25 connector on the other (Figure 24). The DB-25 connector can be male for DTE or female for DCE. To order a cable, see Obtaining Technical Assistance.

Figure 5. EIA/TIA-232 Adapter Cable Connectors, Network End

EIA/TIA-449 Connections

The EIA/TIA-449 standard, which supports balanced and unbalanced transmissions, is a faster (up to 2 Mbps) version of the EIA/TIA-232 standard that provides more functions and supports transmission over greater distances.

The EIA/TIA-449 standard was intended to replace the EIA/TIA-232 standard. However, this standard was not widely adopted because of the large installed base of DB-25 hardware. Also, the larger size of the 37-pin EIA/TIA-449 connectors limited the number of connections possible (fewer than are possible with the smaller, 25-pin EIA/TIA-232 connector).

To make a connection to a Cisco VG310 or a Cisco VG320 voice gateway serial port, use the EIA/TIA-449 serial transition cable with the Cisco 12-in-1 connector on one end and a DB-37 connector on the other (Figure 25). The DB-37 connector can be male for DTE or female for DCE. To order a cable, see Obtaining Technical Assistance.

Figure 6. EIA/TIA-449 Adapter Cable Connectors, Network End

V.35 Connections

The V.35 standard is recommended for speeds up to 48 kbps, although in practice, it is used successfully at 4 Mbps. Cisco VG310 and Cisco VG320 support speeds up to 2.048 Mbps.

Use the V.35 serial transition cable (not included with... ) the Cisco 12-in-1 connector on one end and a standard 34-pin Winchester-type connector (as shown in Figure 26) on the other. The 34-pin Winchester-type connector can be male for DTE or female for DCE. To order a cable, see Obtaining Technical Assistance.

Figure 7. V.35 Adapter Cable Connectors, Network End

X.21 Connections

The X.21 connector uses a 15-pin connector for balanced circuits, and is commonly used in the United Kingdom to connect to the public data network. X.21 relocates some of the logic functions to the DTE and DCE interfaces and, as a result, requires fewer circuits and a smaller connector than EIA/TIA-232.

Use the X.21 serial transition cable (not included with...) the Cisco 12-in-1 connector on one end and a DB-15 connector on the other (Figure 27). The DB-15 connector can be male for DTE or female for DCE. To order a cable, see Obtaining Technical Assistance.

Figure 8. X.21 Adapter Cable Connectors, Network End

EIA/TIA-530 Connections

The EIA/TIA-530 standard, which supports balanced transmission, provides increased functionality, speed, and distance of EIA/TIA-449 on the smaller DB-25 connector used for EIA/TIA-232. Like EIA/TIA-449, EIA/TIA-530 refers to the electrical specifications of EIA/TIA-422 and EIA/TIA-423. Although the specification recommends a maximum speed of 2 Mbps, EIA/TIA-530 is used successfully at 4 Mbps or faster speeds over short distances. The Cisco VG310 and Cisco VG320 Analog Voice Gateways support speeds up to 2.048 Mbps.

Use the EIA/TIA-530 serial transition cable (not included) with the Cisco 12-in-1 connector on one end and a DB-25 connector on the other (Figure 28). The DB-25 connector can be male for DTE or female for DCE. To order a cable, see Obtaining Technical Assistance.

Figure 9. EIA-530 Adapter Cable Connector, Network End

USB Type A-to-USB 5-Pin Mini Type B Cable

The USB console port uses a USB Type A to 5-pin mini Type B cable. The USB Type A-to-USB mini Type B cable is not supplied. You can order an accessory kit that contains this cable. To order a cable, see Obtaining Technical Assistance.

The RJ-45 console port uses an eight-pin RJ-45 connector (Table 25 and Table 26). The supplied RJ-45-to-DB-9 adapter cable is used to connect the console port of Cisco VG310 or Cisco VG320 to a console PC. Provide a RJ-45-to-DB-25 female DTE adapter if you want to connect the switch console port to a terminal.

Table 11. Console Port Signaling Using a DB-9 Adapter

Switch Console Port (DTE)

RJ-45-to-DB-9 Terminal Adapter

Console Device

Signal DB-9 Pin Signal

RTS

8

CTS

No connection

6

DSR

TxD

2

RxD

GND

5

GND

GND

5

GND

RxD

3

TxD

No connection

4

DTR

CTS

7

RTS

Table 12. Console Port Signaling Using a DB-25 Adapter

Switch Console Port (DTE)

RJ-45-to-DB-25 Terminal Adapter

Console Device

Signal DB-25 Pin Signal

RTS

5

CTS

No connection

6

DSR

TxD

3

RxD

GND

7

GND

GND

7

GND

RxD

2

TxD

No connection

20

DTR

CTS

4

RTS