5
X
RS-232,485 + 2
X
E
THERNET
/2 M
BIT
/
S
G.703 (G.704) M
ULTIPLEXER
O
PERATING
M
ANUAL
IOA81-1E
14
August 2004
3.5 Selection of time slots
Assignment of time slots TS of the 2048 kbit/s stream to tributary channels is made by
using „CONFIGURATION” switches. Assignment is effected by selecting the number of first
slot from the group of slots intended for transmission.
The selected group of slots is associated with the C1
÷
C7 tributary channels in such a way
that first tributary channel C1 is assigned to the first slot of the 2048 kbit/s stream, and next
tributary channels C2 – C7 are assigned to next successive slots.
When selecting timeslot it is important to remember that:
•
neither TS0 nor TS16 slots can be selected as a first slot,
•
the TS0 and TS16 slots are not assignable, in compliance with principles described in
point 3.4.
In examples shown below the slot number 2 is selected, i.e. the group of slots 2
÷
9 is de-
signed for transmission.
Selected timeslots are associated with tributary channels, but these channels do not occupy
them. Slots are occupied when specified tributary channels are switched on by switches that
configure the working parameters of tributary channels.
3.6 Selection and configuration of tributary channels
Switching on and configuring of C1
÷
C7 channels, i.e. occupying the selected timeslots, is
possible by using the „TRIBUTARY CHANNEL CONFIGURATION” switches, whereas the
„CHANNEL DIRECTION” switches allow setting, for every channel, from which line port
(A or B) the time slots will be dropped.
Switches on front panel
Initial slot selected by using
CONFIGURATION switches
Input of line
port B
Output of line
port A
Output of
line port B
Input of line
port A
CHANNEL DIRECTION
TRIBUTARY CHANNEL
CONFIGURATION
Selected group of timeslots
. . .
. . .
. . .
. . .
. . .
Selected group of timeslots
A
B
C1-5
C6-7
Fig. 17.
Dropping of 64 kbit/s slots from the 2048 kbit/s signal frame
Summary of Contents for TM-81.1
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