#1
14th April 2016, 01:49 PM
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X21 DCE Pinout
Sir I am B.Tech student and doing the enginnering in the Electronics engineering so can I want to know about the X21 DCE Pinout so can you please tell me the same
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#2
14th April 2016, 01:52 PM
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Re: X21 DCE Pinout
Hey buddy The X.21 interface was recommended by the CCITT in 1976. It is defined as a digital signaling interface between customers (DTE) equipment and carrier's equipment (DCE). X.21 DTE Cable Pinouts (DB-60 to DB-15)' Info is in the below format 60 Pin1 Signal Description Direction 15 Pin Signal X.21 is a state-driven protocol running full duplex at 9600 bps to 64 Kbps with subscriber networks. It is a circuit-switching protocol using Synchronous ASCII with odd parity to connect and disconnect a subscriber to the public-switching network. X.21 provides eight signals: Signal Ground (G) - DTE Common Return (Ga) - Transmit (T) - Receive (R) - Indication (I) - Signal Element Timing (S) - Byte Timing (B) - Electrical Characteristics. Data signaling rates of 9600 bit/s and below. X.27 (= V. 11) & X.26 (= V. 10) Data signaling rates above 9600 bps. X.27 (= V. 11) [V.10 specifies an interface circuit with an unbalanced transmitter with a differential receiver.] [V.11 specifies an interface circuit with a differential, balanced signal from transmitter to receiver which may accommodate an optional DC offset voltage. This approximates EIA- 4221 X.21 Speed and Distance Limitations |