Expansion and Upgrade. Equipment Expansion and Upgrade. Ethernet Service Expansion and Upgrade. Line Rate Expansion and Upgrade, страница 4

Table 6-2 Comparison among GXCS, EXCS and UXCS

System configuration		Configuration I (GXCS)	Configuration II (EXCS)	Configuration II (UXCS)
Crossconnection capability	Higher order	40 Gbit/s (256 x 256 VC-4)	80 Gbit/s (512 x 512 VC-4)	80 Gbit/s (512 x 512 VC-4)
Crossconnection capability	Lower order	5 Gbit/s (2016 x 2016 VC-12)	5 Gbit/s (2016 x 2016 VC-12)	20 Gbit/s (8064 x 8064 VC-12)
Service slot number		14	15	15
STM-64 access capability		2	4	4
STM-16 access capability		6	8	8
STM-4 access capability		32	46	46
STM-1 optical service		60	92	92
STM-1 electrical service		40	64	64
E1/T1		504	504	504
E3/T3		48	48	48
E4		32	32	32
FE		92	92	92
GE		28	28	28

The upgrade of cross-connect capacity can enhance the system access capability and increase the number of 10 Gbit/s access slot to four. Moreover, the upgrade needs not to change the bus configuration of the backplane, because the host supports four 10 Gbit/s slots and four 2.5 Gbit/s slots automatically.

1. Case Description

In the example shown in chapter 3, if the cross-connect capacity is insufficient with GXCS boards, you can upgrade the cross-connect boards to meet the requirement, that is, upgrade GXCS boards in slot 9 and slot 10 to EXCS boards.

Figure 6-7 shows the slot access capacity with GXCS boards, and Figure 6-8 shows the slot access capacity with EXCS boards.

Figure 6-7 Slot access capacity with GXCS

Figure 6-8 Slot access capacity with EXCS

2. Procedure

Caution:

The NE software is compatible with both GXCS and EXCS. However, GXCS and EXCS are not allowed to co-exist for a long time in an NE, except the temporary coexistence during upgrading.

The cross-connect board cannot change to GXCS after it is configured as EXCS (that is, insert 2.5 Gbit/s board in slot 5 or 13 and 10 Gbit/s board in slot 7 or 12). If you want to revert to GXCS, you have to delete EXCS boards.

Step	Action
1	Prepare two EXCS boards. Check the working status of the expansion board and check whether the software is compliant.
2	Check the working status of the two GXCS boards by querying on NM or observing board indicators.
3	Replace the standby GXCS board with the EXCS board.
4	When the EXCS board starts to works, deliver services to it through NM.
5	When EXCS works normally, switch it to the active board forcedly through NM.
6	Use EXCS to replace the other GXCS likewise.
7	On NM, you can query whether slot 7 and slot 12 allow creating STM-64 service boards. If so, the upgrade succeeds.

6.1.6 Add an Extended Subrack

The OptiX OSN 3500 supports the extended subracks that add/drop up to 504 x E1 services.

When the main subrack is configured with the UXCSB board, the equipment can support a 1.25 Gbit/s extended subrack.

1. Case Description

NE1 is the central station in the network described in chapter 3. Now, NE1 is required to add/drop extra 100 x 2 Mbit/s services. However, the reserved slot (slot 13) in the subrack fails to hold two tributary boards (PQ1). In this case, you can add an extended subrack to solve the problem.

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