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Table 2. Speed Settings Using Switches 1 and 2
Switch 1
Down
Up
Down
Up
Frame Type
Switch 3 sets the Frame Type for the E1 port on both the ENE2000-P and the
ENE2000-S.
Frame type is the E1 data encapsulation method. A frame consists of 248 bits (8-bit
samples of each of the 31 E1 data channels plus a synchronization bit) transmitted at a
rate of 8,000 frames per second (1,984 kbps) across the E1 line. The ENE2000 can be
configured to use Cyclic Redundancy Check (CRC) to detect line errors and scrutinize
data integrity across the E1 line by appending a hexadecimal checksum (calculated
from the previous E1 frame contents) to the end of each E1 frame. The remote modem
then makes a similar calculation upon receipt of each E1 frame and compares it to the
checksum of the ensuing E1 frame.
Table 3. Frame Type Settings Using Switch 3
Switch 3
Down
Up
Line Code
Switch 4 sets the Line Code for the E1 port on both the ENE2000-P and the
ENE2000-S.
Line code is the E1 mode of transmission. The two line code options outlined below fall
within the International Telecommunication Union - Telecommunication Standardization
Sector (ITU-T) G.703 Standards for Transmission Facilities.
High Density Binary 3 – High Density Binary 3 (HDB3) is used to accommodate
the minimum ones density requirement in the European public network. HDB3 line
encoding helps prevent loss of synchronization between the ENE2000 and remote
E1 equipment by using bipolar violations to guarantee the presence of pulses in the
E1 line.
Switch 2
Timeslots
Down
Down
Up
Up
Frame Type
Cyclic Redundancy Check
No Cyclic Redundancy Check
Bandwidth (kbps)
1–31
1–24
1–16
1–8
5
1,984
1,536
1,024
512
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