24
Echo 2 Mbps Multiplexer
SALES: 0118 965 5100
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 CHOICES
NOTES
Main Link
Present
CRC4 Hunt
Lost
Shows whether the link is
successfully connected. No
options selectable.
Mode
NORMAL
Normal run mode.
LOCAL
LOOP Composite loopback, causes
MUX to get carrier even
when not connected to link.
REMOTE
LOOP Payload loopback, causes
data at E1 port to be echoed
to the network.
Framing
CRC4
16 Frame synchronisation,
using CRC4 pattern. Allows
better link diagnostics.
NON-CRC4
2 Frame Synchronisation
only.
Clock Reference
INTERNAL
Clock sourced from Internal
Crystal reference.
LOOP
Clock sourced from MAIN
E1 RX data.
THROUGH
Clock sourced from D&I E1
RX data (only available if
D&I port fitted.
CHANNEL
1..4 Clock sourced from data
channel external clock pin.
Must be accurate to 50ppm
or better.
