Eia/Tia-232 Connections; Eia/Tia-449 Connections - Cisco VG224 - Analog Phone Gateway Hardware Installation Manual
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Analog Voice Multiport Pinouts (RJ-21X/CA21A)
Table A-6
Port
Number
12
—
EIA/TIA-232 Connections
The EIA/TIA-232 standard supports unbalanced circuits at signal speeds up to 64 kbps.
For connection to a Cisco VG224 voice gateway 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 (as shown in
other. The DB-25 connector can be male for DTE or female for DCE. To order a cable, see the
Technical Assistance" section on page
Figure A-7
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 VG224 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 (as shown in
the other. The DB-37 connector can be male for DTE or female for DCE. To order a cable, see the
"Obtaining Technical Assistance" section on page
Figure A-8
Cisco VG224 Voice Gateway Hardware Installation Guide
A-8
RJ-21 Connector Pinouts
Connector Pin
Number
Signal
12
Ring
37
Tip
—
—
EIA/TIA-232 Serial Transition Cable Connectors
EIA/TIA-449 Serial Transition Cable Connectors
Appendix A
Port
Connector Pin
Number
Number
24
24
49
—
25, 50, 51, 52
16.
DTE
DCE
16.
DTE
DCE
Cable Specifications and Information
Signal
Ring
Tip
GND
Figure
A-7) on the
"Obtaining
Figure
A-8) on
OL-5006-04
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Troubleshooting
