V.35 Connections; X.21 Connections; Eia/Tia-530 Connections; V.35 Serial Transition Cable Connectors - Cisco VG224 - Analog Phone Gateway Hardware Installation Manual

Appendix A Cable Specifications and Information

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
Winchester-type connector can be male for DTE or female for DCE. To order a cable, see the
Technical Assistance" section on page
Figure A-9

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
female for DCE. To order a cable, see the
Figure A-10 X.21 Serial Transition Cable Connectors

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
DTE or female for DCE. To order a cable, see the
OL-5006-04

V.35 Serial Transition Cable Connectors

1
8
9
15
16.
DTE
DCE
Figure A-10) on the other. The DB-15 connector can be male for DTE or
"Obtaining Technical Assistance" section on page
DTE
DCE
Figure A-11) on the other. The DB-25 connector can be male for
"Obtaining Technical Assistance" section on page
Cisco VG224 Voice Gateway Hardware Installation Guide
Analog Voice Multiport Pinouts (RJ-21X/CA21A)
Figure A-9) on the other. The 34-pin
"Obtaining
16.
16.
A-9