E1/T1 TRAINER

            E1 link is a communication link protocol which can handle 30 PCM 64KBPS voice channels which are assigned to 30 time slots with one 64KBPS signaling channel occupying one single time slot aggregating 2048 KBPS data rate. This protocol is basically followed by European countries for Trunk communication links between exchange to exchange or between and access links. This is basically a time division multiplexed frame.

            T1 link is a communication link protocol which can handle 24 PCM 64 KBPS voice channels which are assigned to 24 different time slots with one 64KBPS signaling channel occupying one single time slot aggregating 1544 KBPS data rate. This protocol is basically followed by American for Trunk communication link between exchange to exchange or between exchange and access links. This is demonstrated with the above 2 terminals supplied.

             Two telephone lines from the EPABX (or from 2 telephone land lines) are connected to the E1/T1 terminal with the exchange interface called COT terminal. The voice signal from the lines are converted to PCM signals of 64KBPS. This can occupy any two of the 30 times slots which is programmable from the keypad provided. The line signaling (like off hook, ringing) are connected to data signals which occupy the time slot meant for signaling. These signals are formatted as per E1 or T1 which can again be selected from the front panel keypad of the units.

             The aggregate 2048 (E1) or 1544 (T1) KBPS signal is line coded to HDB3 format before connected to the Copper Pair.The other E1/T1 terminal called RT terminal with subscriber interface is also similar to the above.These two terminals when they are interconnected through E1/T1 signals, with EPBAX connected to COT and telephones connected to RT can acts as an E1 or T1 link with 2 telephones on a single pair of wire.

   Specification :

Max No. of Voice Channels : 30/24 for E1/T1
Available Voice Channel : 2
Voice coding : PCM
Voice channel data rate : 64KBPS
Selection of E1/T1 : Through keypad
Selection of time slot : Through Keypad
Signaling Channel Rate : 64 KBPs
Aggregate E1/T1 data rate : 2048/1544 KBPs
Line Coding : HDB3
Line Impedance : 120 ohms.