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Cisco VG224 Voice Gateway Hardware Installation Guide
OL-5006-04
Appendix A Cable Specifications and Information
Analog Voice Multiport Pinouts (RJ-21X/CA21A)
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 Figure A-7) on the
other. The DB-25 connector can be male for DTE or female for DCE. To order a cable, see the “Obtaining
Technical Assistance” section on page 16.
Figure A-7 EIA/TIA-232 Serial Transition Cable Connectors
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 Figure A-8) on
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 16.
Figure A-8 EIA/TIA-449 Serial Transition Cable Connectors
12 12
37
Ring
Tip
24 24
49
Ring
Tip
— — — — 25, 50, 51, 52 GND
Table A-6 RJ-21 Connector Pinouts
Port
Number
Connector Pin
Number Signal
Port
Number
Connector Pin
Number Signal
194831
DTE
DCE
194832
DTE
DCE