Cisco VG224 Hardware Installation Guide - Page 71
V.35 Connections, EIA/TIA-530 Connections, A-9, V.35 Serial Transition Cable Connectors
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Appendix A Cable Specifications and Information Analog Voice Multiport Pinouts (RJ-21X/CA21A) 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. The Cisco VG224 voice gateway supports 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 A-9) on the other. The 34-pin Winchester-type 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-9 V.35 Serial Transition Cable Connectors DTE 8 1 15 9 DCE 194833 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 (as shown in Figure A-10) on the other. The DB-15 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-10 X.21 Serial Transition Cable Connectors DTE DCE 194834 EIA/TIA-530 Connections The EIA/TIA-530 standard, which supports balanced transmission, provides the 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. Cisco VG224 voice gateway supports 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 (as shown in Figure A-11) 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. OL-5006-04 Cisco VG224 Voice Gateway Hardware Installation Guide A-9