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© Sealevel Systems, Inc. 5011 Manual | SL9167 12/2022
Appendix C – Electrical Interface, Continued
V.35
V.35 is a standard defined by ITU (formerly CCITT) that specifies an electrical, mechanical, and physical
interface that is used extensively by high-speed digital carriers such as AT&T Dataphone Digital Service
(DDS). ITU V.35 is an international standard that is often referred to as Data Transmission at 48 Kbps using
60 - 108 KHz Group-Band Circuits. ITU V.35 electrical characteristics are a combination of unbalanced
voltage and balanced current mode signals. Data and clock signals are balanced current mode circuits.
These circuits typically have voltage levels from 0.5 Volts to -0.5 Volts (1 Volt differential). The modem
control signals are unbalanced signals and are compatible with RS-232. The physical connector is a 34 pin
connector that supports 24 data, clock, and control signals. The physical connector is defined in the ISO-
2593 standard. ITU V.35 specification defines two types of interface circuits, Data Terminal Equipment
(DTE) and Data Circuit-Terminating Equipment (DCE). The Sealevel Systems adapter is a DTE interface.
Summary of Contents for Route 56
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