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:
•
EIA/TIA-232 Connections, on page 79
•
EIA/TIA-449 Connections, on page 80
•
V.35 Connections, on page 80
•
X.21 Connections, on page 81
•
EIA/TIA-530 Connections, on page 81
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
Cisco VG310 and Cisco VG320 Voice Gateways Hardware Installation Guide
OL-31292-01 79
Cable Specifications and Information
Serial Connection Signals and Pinouts
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