15
Echo 2 Mbps Multiplexer
TECHNICAL: 0118 931 2233
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).
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 V1.00
=============================== 15:31 16/09/96 ==================================
Main Link (EUR)
: SYNCHRONISED
Mode
: NORMAL Nx64 Channels
: 4
Framing
: CRC4
* D&I Channels
: 1
Idle Bandwidth
: 320K System Alarms
: Minor
Clock Reference
: THROUGH Statistics
: Error Counts
Configuration
: LOCAL
Events
: Log
D&I Channel (EUR) : 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
=================================================================================
Use <SPACEBAR>/<+>/<-> to select
