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Echo 2 Mbps Multiplexer
For EUROPEAN connection, un-screened RJ45 cables are suitable. The screen to chassis
links must be fitted in the isolated position (LK1 = 1-2, LK2 = 1-2).
The positions of the links LK1, LK2 and the UK/EUR selector are shown (fitted for European
120 Ohms) on the diagram shown above.
Composite Link Parameters
Parameters in the System area (upper left) and the choices available by pressing the Space
Bar or + and - keys are:
PARAMETER
Main Link
Mode
Framing
Clock Reference
24
SALES: 0118 965 5100
CHOICES
Present
CRC4 Hunt
Lost
NORMAL
LOCAL LOOP
REMOTE LOOP
CRC4
NON-CRC4
INTERNAL
LOOP
THROUGH
CHANNEL 1..4
NOTES
Shows whether the link is
successfully connected. No
options selectable.
Normal run mode.
Composite loopback, causes
MUX to get carrier even
when not connected to link.
Payload loopback, causes
data at E1 port to be echoed
to the network.
16 Frame synchronisation,
using CRC4 pattern. Allows
better link diagnostics.
2 Frame Synchronisation
only.
Clock sourced from Internal
Crystal reference.
Clock sourced from MAIN
E1 RX data.
Clock sourced from D&I E1
RX data (only available if
D&I port fitted.
Clock sourced from data
channel external clock pin.
Must be accurate to 50ppm
or better.
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