Cambium PTP 670 Series, Руководство пользователя

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Chapter 3: System planning Data throughput capacity tables
Page 3-127
TDM traffic load
Encapsulated data
The NIDU supports separate management and TDM data protocol interfaces. The management
interface is between the NIDU and a directly-connected ODU. The TDM data interface is
between peer NIDUs. The ODU does not interact with the TDM data protocol, except in as
much as it provides a separate high priority queue for encapsulated TDM data at the wireless
interface.
The wireless capacity sacrificed to carry the encapsulated TDM data is shown in
Table 134 .
Table 134 TDM traffic load
Channels Octets per Ethernet frame E1 data rate (Mbit/s) T1 data rate (Mbit/s)
1 90 2.94 2.22
2 157 5.08 3.83
3 224 7.22 5.45
4 291 9.36 7.06
5 358 11.50 8.67
6 425 13.65 10.29
7 492 15.79 11.90
8 559 17.93 13.52
In the best case (eight channels) the encapsulation has an efficiency of 91.6%.
Timing only
The resulting TDM traffic load in timing-only operation is shown in Table 135 .
Table 135 TDM traffic load in timing-only
Channels Octets per Ethernet frame E1 data rate (Mbit/s) T1 data rate (Mbit/s)
1 64 0.53 0.40
2 64 0.53 0.40
3 64 0.53 0.40
4 64 0.53 0.40
5 64 0.53 0.40
6 64 0.53 0.40
7 65 0.54 0.40
8 71 0.58 0.44