Cisco ONS 15454 SDH Specifications Page 126

  • Download
  • Add to my manuals
  • Print
  • Page
    / 262
  • Table of contents
  • TROUBLESHOOTING
  • BOOKMARKS
  • Rated. / 5. Based on customer reviews
Page view 125
3-6
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 3 Card Reference
Electrical Card Protection
The physical E-1 or DS-3 ports on the ONS 15454 SDH FMEC cards use the working card until the
working card fails. When the node detects this failure, the protection card takes over the physical E-1 or
DS-3 electrical interfaces through the relays and signal bridging on the backplane. Figure 3-2 shows the
ONS 15454 SDH in a 1:N protection configuration. Each side of the shelf assembly has only one card
protecting all of the cards on that side.
Figure 3-2 ONS 15454 SDH cards in a 1:N protection configuration
3.2.3.1 Revertive Switching
1:N protection supports revertive switching. Revertive switching sends the electrical interfaces back to
the original working card after the card comes back online. Detecting an active working card triggers the
reversion process. There is a variable time period for the lag between detection and reversion, called the
revertive delay, which you can set using Cisco Transport Controller (CTC). For instructions, refer to the
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3. All cards in a protection group share
the same reversion settings. 1:N protection groups default to automatic reversion.
3.2.3.2 1:N Protection Guidelines
Several rules apply to 1:N protection groups in the ONS 15454 SDH:
Working and protect card groups must reside in the same card bank (A or B).
The 1:N protect card must reside in Slot 3 for side A and Slot 15 for side B.
Working cards may sit on either or both sides of the protect card.
TCC-I
XC10G
XC10G
TCC-I
Working
Working (not electr.)
Working
Working
Working
Working (not electr.)
Working
Working
Working
Working
1:N Protection
1:N Protection
1:N Protection
61244
FMEC
FMEC
FMEC
FMEC
FMEC
MIC-A/P
MIC-T/C/P
FMEC
FMEC
FMEC
FMEC
FMEC
Page view 125
1 2 ... 121 122 123 124 125 126 127 128 129 130 131 ... 261 262

Comments to this Manuals

No comments