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what means E1, E2, E3, E4 . . T1,T3, . . ?

These are Data-Line definitions for internet connections

Signal Speed Channels
E-0 64 Kbps 1 x E-0
E-1 2.048 Mbps 32 x E-0
T-1/DS1 1.544 Mbps  
multiple E1 with Cisco n x 2.048 Mbps up to 240
E-2 8.448 Mbps 128 x E-0
DS2/T-2 6.312 Mbps  
E-3 34.368 Mbps 16 x E-1
T-3 44.736 Mbps  
E-4 139.264 Mbps 4 x E3
E-5 565.148 Mbps 4 x E4

optional there are 155 Mbps and 622 Mbps and more on fiber optics

Some Electrical Characteristics for En

Cabling Coaxial or one symmetrical pair (4 wires) for each direction
Mark Balanced: 3.0 Vdc
Unbalanced: 2.37 Vdc
Space Balanced: 0 Vdc +/- 0.237 Vdc
Unbalanced: 0 Vdc +/- 0.3 Vdc
Pulse width 488 nsec
Encoding AMI or High Density Bipolar of order 3 (HDB3)
Speed 2048 kbps +/- 50 ppm

Pinning Specifications

Sub-D15 Male Female

Signal RJ45 Description DTE RJ45 BNC Description DTE BNC
RxA Receive Input Negative 1 Receive Input Tip
RxB Receive Input Positive 2 Receive Ground Ring
TxA Transmit Output Negative 4 Transmit Output Tip
TxB Transmit Output Positive 5 Transmit Ground Ring
S1 Transmit Ground 3    
S2 Receive Ground 6    
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