EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 617)

Glossary
SONET/SDH Application 603
G.709 Optical Transport Network (OTN)
The OTU, ODU (including the ODU tandem connection) and OPU layers
can all be analyzed and monitored. As per ITU G.709, current test solutions
offer these possibilities using three line rates:
³
OTU1 (255/238 x 2.488 320 Gbps ˜ 2.666057143 Gbps) also referred to
as 2.7 Gbps
³
OTU2 (255/237 x 9.953280 Gbps ˜ 10.709225316 Gbps) also referred to
as 10.7 Gbps
³
OTU3 (255/236 x 39.813120 Gbps ˜ 43.018413559 Gbps) also referred to
as 43 Gbps
Each line rate is adapted to service different client signals:
³
OC-48/STM-16 is transported via OTU1
³
OC-192/STM-64 is transported via OTU2
³
OC-768/STM-256 is transported via OTU3
³
Null Client (All 0s) is transported via OTUk (k = 1, 2, 3)
³
PRBS 231-1 is transported via OTUk (k = 1, 2, 3)
In order to map client signals via ITU G.709, they are encapsulated using
the structure illustrated in the following figure.
Basic OTN Transport Structure