Cisco ONS 15454 SDH Specifications download pdf (Page 164)

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

May 2002

Chapter 3 Node Setup

Creating Card Protection Groups

• BITS 1 Out/BITS 2 Out—Set to None

Step 6 Click Apply.

Step 7 Log into a node that will be timed from the node set up in Step 1 to Step 6.

Step 8 In the CTC node view, click the Provisioning > Timing tabs.

Step 9 In the General Timing section, enter the following:

• Timing Mode—Set to Line.

• Revertive—Not relevant for internal timing; the default setting (checked) is sufficient.

• Revertive Time—The default setting (5 minutes) is sufficient.

Step 10 In the Reference Lists section, enter the following:

• NE Reference

–

Ref-1—Use the pull-down menu to choose the STM-N trunk card with the closest connection

to the node in Step 3.

–

Ref-2—Use the pull-down menu to choose the STM-N trunk card with the next closest

connection to the node in Step 3.

–

Ref-3—Use the pull-down menu to choose Internal Clock.

Step 11 Click Apply.

Step 12 Repeat Step 7 to Step 11 at each node that will be timed by the node serving as the timing source.

3.6 Creating Card Protection Groups

The ONS 15454 SDH provides several card protection methods. When you set up protection for ONS

15454 SDH cards, you must choose between maximum protection and maximum slot availability. The

highest protection reduces the number of available card slots; the highest slot availability reduces the

protection. Table 3-6 shows the protection types that can be set up for ONS 15454 SDH cards.

Table 3-6 Protection Types

Type Cards Description

1:1 E1-N-14

E3-12

DS3i-N-12

Pairs one working card with one protect card. Install the protect card in

an odd-numbered slot and the working card in an even-numbered slot

next to the protect slot towards the center, for example: protect in Slot

1, working in Slot 2; protect in Slot 3, working in Slot 4; protect in Slot

15, working in Slot 14.

1:N E1-N-14

DS3i-N-12

Assigns one protect card for several working cards. The maximum is

1:5. Protect cards (E1-N-14, DS3i-N-12) must be installed in Slots 3 or

15 and the cards they protect must be on the same side of the shelf.

Protect cards must match the cards they protect. For example, a

E1-N-14 can only protect E1-N-14 cards. If a failure clears, traffic

reverts to the working card after the reversion time has elapsed.

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