Alcatel-Lucent 9500 MXC User Manual page 854

Vol. VI-E-8
Example Ring Node with Pt-to-Pt Overlay
Figure E-7.
64xE1
RAC
48xE1 Ring +
16xE1 Pt-to-Pt
Pt-to-Pt
Ch1 16xE1
Ch2 16xE1
INUe
64xE1 RAC
8 ring timeslots
dropped
16 pt-to-pt
circuits dropped
P = Pt-to-Pt capacity (total dropped) = 32xE1
R = Ring capacity = 48xE1
d = Ring drop-insert capacity = 8xE1
Bus capacity used = P + R + d/2
In this example bus capacity demands are within the 100xE1 maximum.
However, if all ring-protected circuits are to be sourced/sunk at one ring node,
then the capacity formula shows that for such a node:
P = Pt-to-Pt capacity (total dropped) = 32xE1
R = Ring capacity = 48xE1
d = Ring drop-insert capacity = 24xE1
Bus capacity used = 32 + 48 + 24 = 104, which is not valid. Refer to Figure E-8.
DAC ES DAC 16x
8xE1 Drop-Insert
32 Mb LAN
Connection
48 timeslots
passed
48-8 timeslots
passed
Ch 1 Ch 2
DAC ES DAC 16x
32 Mb LAN 8xE1
= 32xE1 + 48xE1 + 4xE1 = 84xE1
64xE1
RAC
48xE1 Ring +
16xE1 Pt-to-Pt
64xE1
RAC
8 ring timeslots
inserted
16 pt-to-pt
circuits dropped
Alcatel-Lucent