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Note: If an external clock option is selected, unless the external device is
synchronised to the main link clock, clock slips will inevitably occur, leading to data
loss.
Drop and Insert (D&I) channel operation
The optional G.703 Drop and Insert channel allows connection of external G.703 equipment
(eg. PABX) which uses only part of the 2 megabit timeslot map. This is sometimes referred
to as 'Fractional E1'.
The timeslots are assigned as shown above for channels, using 'D' to select the D&I channel.
An additional menu page is available, allowing the Time Slot Map to be edited, whilst
showing the D&I channel settings.
The way in which the D&I channel synchronises as well as mode settings, are also set on this
page. For more details of these link settings see the main link parameter settings section
(page 24).
=============================== 15:31 16/09/96 ==================================
Main Link (EUR)
Idle Bandwidth
Clock Reference
Configuration
D&I Channel (EUR)
=================================================================================
Use <SPACEBAR>/<+>/<-> to select
When the D&I card is fitted, it is also possible to slave the clock reference to the D&I
channel. This is achieved by selecting THROUGH as the Clock Reference as shown above.
2 MEGABIT E1 MULTIPLEXER
:
SYNCHRONISED
Mode
:
NORMAL
Framing
:
CRC4
:
320K
:
THROUGH
:
LOCAL
:
NO CARRIER
Drop Bandwidth
:
1024K
Mode
:
NORMAL
Framing
:
CRC4
----------------------- TIMESLOT MAP --------------------------
0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
---------------------------------------------------------------
R 2 2 1 1 2 2 1 1 1 1 - - - - - D D D D D D D D D D D D D D D D
Cursor Keys to move, CTRL-U to save, ESC to abandon
Echo 2 Mbps Multiplexer
V1.00
Nx64 Channels
: 4
* D&I Channels
: 1
System Alarms
: Minor
Statistics
: Error Counts
Events
: Log
TECHNICAL: 0118 931 2233
15
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