Page 1118 - 5G Basics - Core Network Aspects

2 Transport aspects

Figures 7-5, 7-6 and 7-7 show how various signals are multiplexed using the ODTUG2/3/4 (PT=21)
multiplexing elements.

Figure 7-5 presents the multiplexing of up to eight ODU0 signals, and/or up to four ODU1 signals and/or up
to eight ODUflex signals into the OPU2 signal via the ODTUG2 (PT=21). An ODU1 signal is extended with a
frame alignment overhead and asynchronously mapped into the optical data tributary unit 1 into 2
(ODTU12) using the AMP justification overhead (JOH). An ODU0 signal is extended with a frame alignment
overhead and asynchronously mapped into the optical data tributary unit 2.1 (ODTU2.1) using the GMP
justification overhead. An ODUflex signal is extended with a frame alignment overhead and asynchronously
mapped into the optical data tributary unit 2.ts (ODTU2.ts) using the GMP justification overhead. Up to
eight ODTU2.1 signals, up to four ODTU12 signals and up to eight ODTU2.ts signals are time-division
multiplexed into the optical data tributary unit group 2 (ODTUG2) with payload type 21, after which this
signal is mapped into the OPU2

ODU ODU payload ODU ODU0 ODU0 payload ODU0 ODU1 ODU1 payload ODU1
OH OH OH
ODTU2.ts ODU ODTU2.1 ODTU12
JOH (ODUflex) ODTU2.ts JOH ODU0 ODTU2.1 JOH ODU1 ODTU12

ODTU2.ts ODTU2.ts ODTU2.1 ... ODTU2.1 ODTU12 ... ODTU12 ODUflex ... ODUflex ODU0 ... ODU0 ODU1 ... ODU1 ODTUG2
JOH JOH JOH JOH JOH JOH (PT = 21)
ODTUG2 (PT = 21)

OPU2 OPU2 payload OPU2
OH
ODU2 ODU2 payload ODU2
OH
. G.709-Y.1331(12)_F7-5

Figure 7-5  ODU0, ODU1 and ODUflex into ODU2 multiplexing method via ODTUG2 (PT=21)
Figure 7-6 presents the multiplexing of up to thirty-two ODU0 signals and/or up to sixteen ODU1 signals
and/or up to four ODU2 signals and/or up to three ODU2e signals and/or up to thirty-two ODUflex signals
into the OPU3 signal via the ODTUG3 (PT=21). An ODU1 signal is extended with a frame alignment
overhead and asynchronously mapped into the optical data tributary unit 1 into 3 (ODTU13) using the AMP
justification overhead (JOH). An ODU2 signal is extended with a frame alignment overhead and
asynchronously mapped into the optical data tributary unit 2 into 3 (ODTU23) using the AMP justification
overhead. An ODU0 signal is extended with a frame alignment overhead and asynchronously mapped into
the optical data tributary unit 3.1 (ODTU3.1) using the GMP justification overhead. An ODU2e signal is
extended with a frame alignment overhead and asynchronously mapped into the optical data tributary
unit 3.9 (ODTU3.9) using the GMP justification overhead. An ODUflex signal is extended with a frame
alignment overhead and asynchronously mapped into the optical data tributary unit 3.ts (ODTU3.ts) using
the GMP justification overhead. Up to thirty-two ODTU3.1 signals, up to sixteen ODTU13 signals, up to four
ODTU23 signals, up to three ODTU3.9 and up to thirty-two ODTU3.ts signals are time-division multiplexed
into the optical data tributary unit group 3 (ODTUG3) with payload type 21, after which this signal is
mapped into the OPU3.

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