FlexDSL ORION 2 - Page 21

User Manual NTU Orion 2
21
Table 3.5 Examples of reservation with two channels.
Mode
Normal mode DSL2 down DSL1 down
DSL1 DSL2 DSL1 DSL2 DSL1 DSL2
DSL1: baserate 72,
DSL2: baserate 61
E1-1,
40 TS
WAN
E1-2,
29 TS
WAN
E1-1,
40 TS
WAN Failure Failure
E1-1,
29 TS WAN
Total E1-1, E1-2, 69 TS WAN E1-1, 40 TS WAN E1-1, 29 TS WAN
DSL1: baserate 72,
DSL2: baserate 61
E1-1, E1-2,
8 TS WAN
61 TS
WAN
E1-1, E1-2,
8 TS WAN
Failure Failure
E1-1,
28 TS E1-2, 1
TS WAN
Total E1-1, E1-2, 69 TS WAN
E1-1, E1-2, 8 TS
WAN
E1-1, 28 TS E-12,
1 TS WAN
DSL1: baserate 72,
DSL2: baserate 61
72 TS
WAN
E1-1,
29 TS
WAN
72 TS
WAN
Failure Failure
61 TS WAN
Total E1-1, 101 TS WAN 72 TS WAN 61 TS WAN
DSL1: baserate 89,
DSL2: baserate 89
E1-1,
57 TS
WAN
E1-2, E1-3,
25 TS
WAN
E1-1,
57 TS
WAN
Failure Failure
E1-1,
57 TS WAN
Total
E1-1, E1-2, E1-3,
82 TS WAN E1-1, 57 TS WAN E1-1, 57 TS WAN
Figure 3.6 illustrates an example of reservation for a two-channel system (according to the two
last rows in Table 3.5),
X means a contingency:
• Line rate over DSL1 and DSL2 is 89x64 kBit/s;
• In the normal mode, the system transmits the E1-1 stream, WAN data (Ethernet) over DSL1
and E1-2, E1-3, WAN data (Ethernet) over DSL2;
• The DSL1 interface has a higher priority compared to DSL2, therefore if communication in
the DSL2 channel fails (down), no reservation occurs (DSL1 Up, DSL2 Down);
• In the case of a contingency at the DSL1 interface (for example, loss of signal), E1-1
streams and WAN are transmitted over the DSL2 link.