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Alternate Mark Inversion – Alternate Mark Inversion (AMI) simply alternates
positive and negative pulses. Although AMI links typically encounter long strings of
zeros which can potentially cause loss of synchronization between units, the
ENE2000 meets the European minimum ones density requirement internally such
that, even with AMI, loss of synchronization is prevented between the ENE2000 and
remote E1 equipment (just as it is with HDB3).
Table 4. Line Code Settings Using Switch 4
Switch 4
Down
Up
Timing
Switch 7 sets the timing for the ENE2000-P (only). The ENE2000-S determines timing
for its E1 link via communication with its partner E1 provider unit.
Timing refers to the clock source for E1 transmission links.
Local Clock Source – Local clock source refers to timing derived from an oscillator
onboard the ENE2000-P.
Loop Clock Source – Loop clock source refers to timing derived from an
intermediate device.
Table 5. Setting Timing Source Using Switch 7
Switch 7
Down
Up
Connecting the E1 Line
To connect the E1 line:
Procedure
1. Plug the E1 cable into the E1 RJ45 port on the back of the ENE2000.
2. Verify the connection: the E1 link LED on the front of the ENE2000 will pulse green
to indicate the connection is established and operational.
Line Code
High Density Binary 3
Alternate Mark Inversion
Clock Source
Local
Loop
6
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