Cisco ONS 15454 SDH Specifications download pdf (Page 231)

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Cisco ONS 15454 SDH Installation and Operations Guide, R3.3

May 2002

Chapter 5 SDH Topologies

Upgrading From Two-Fiber to Four-Fiber MS-SPRings

Step 13 Clear the protection switches on the neighboring nodes:

a. Display the node with the protection switch on its east port.

b. Click the Maintenance > Ring tabs and choose CLEAR from the East Switch list. Click Apply.

c. Start CTC for the node with the protection switch on its west port.

d. Click the Maintenance > Ring tabs and choose CLEAR from the West Switch list. Click Apply.

Step 14 If a BITS clock is not used at each node, check that the synchronization is set to one of the eastbound or

westbound MS-SPRing spans on the adjacent nodes. If the removed node was the BITS timing source,

use a new node as the BITS source or select internal synchronization at one node where all other nodes

will derive their timing. (For information about ONS 15454 SDH timing, see the “Setting Up ONS 15454

SDH Timing” section on page 3-16.)

5.7 Upgrading From Two-Fiber to Four-Fiber MS-SPRings

Two-fiber STM-16 or STM-64 MS-SPRings can be upgraded to four-fiber MS-SPRings. To upgrade, you

install two STM-16 or STM-64 cards at each two-fiber MS-SPRing node, then start CTC and upgrade

each node from two-fiber to four-fiber. The fibers that were divided into working and protect bandwidths

for the two-fiber MS-SPRing are now fully allocated for working MS-SPRing traffic.

Procedure: Upgrade From a Two-Fiber to a Four-Fiber MS-SPRing

Step 1 Start CTC for one of the two-fiber MS-SPRing nodes and display the network view. Clear any alarms or

conditions. See the “Check for Alarms” procedure on page 5-61.

Step 2 Install two STM-16 or STM-64 cards at each MS-SPRing node. You must install the same STM-N card

rate as the two-fiber ring. See the “Card Installation” section on page 1-27.

Step 3 Set the card ports in service for each new STM-N card. See the “Set Card Ports In Service” procedure

on page 5-60.

Step 4 Connect the fiber to the new cards. Use the same east/west connection scheme that connected the

two-fiber connections. Figure 5-22 on page 5-27 shows an example of how to connect fiber.

Step 5 Test the new fiber connections using procedures standard for your site. For example, pull a Tx fiber for

a protect card and verify that an LOS alarm displays for the appropriate Rx card. Do this fiber test for

every span in the MS-SPRing protect ring.

Step 6 Perform a span lockout at each MS-SPRing node (Figure 5-31 on page 5-42):

a. At one of the MS-SPRing nodes, display the node view. Click the Maintenance > Ring tabs.

b. Under West Switch for the two-fiber MS-SPRing you will convert, choose LOCKOUT SPAN. Click

Apply.

c. Under East Switch, choose LOCKOUT SPAN. Click Apply.

Purpose Use this procedure to upgrade from a two-fiber MS-SPRing to a four-fiber

MS-SPRing.

Prerequisite Procedures This procedure assumes you have a two-fiber MS-SPRing configured.

Onsite/Remote Onsite

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Cisco ONS 15454 SDH Specifications Page 231