OptiX OSN 7500
Technical Manual - System Description
6 Data Features
Huawei Technologies Proprietary
6-19
Node 1
Node 2
Node 5
Node 6
Dual-ring
2.5 Gbit/s RPR
Node 4
Node 3
X
Fiber cut
Traffic flow
after switching
Traffic flow before
switching
Figure 6-17
Steering protection
3.
Spanning Tree and LCAS
For details about spanning tree and LCAS, refer to “6.1 Ethernet”.
6.3
ATM Features
This section describes the ATM features of the OptiX OSN 7500 in terms of
functionality, application, and protection.
6.3.1 Functions
The OptiX OSN 7500 provides four different ATM processing boards: ADL4, ADQ1,
IDL4 and IDQ1. The IDL4 and the IDQ1 support inverse multiplexing for ATM (IMA).
An ADL4/IDL4 board can access and process one STM-4 ATM service and an
ADQ1/IDQ1 board can access and process four STM-1 ATM services. When working
with the PL3/PD3 board, the ADL4 board or ADQ1 board can access and process E3
ATM services. The functions of the four boards are listed in Table 6-4.
Table 6-4
Functions of the four ATM boards
Board
Function
ADL4/IDL4
ADQ1/IDQ1
Front panel interface
1 x STM-4
4 x STM-1
Optical interface index
S-4.1, L-4.1
I-1, S-1.1, L-1.1
Optical interface type
Hot swappable LC (SFP)
Hot swappable LC (SFP)
