18-8
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
August 2005
Chapter 18 Network Reference
18.3.1 Optical Performance for Rings and Linear Networks with OADM Nodes
18.3.1 Optical Performance for Rings and Linear Networks with OADM Nodes
The following tables provide optical performance estimates for open and closed ONS 15454 rings and
linear networks with OADM nodes.
Table 18-3 shows the optical performance for 32-channel networks using SMF fiber. Span losses shown
in the table assume:
• OADM nodes have a loss of 16 dB and equal span losses.
• The DCU loss is 9 dB.
• Optical Preamplifier (OPT-PRE) and Optical Booster (OPT-BST/OPT-BST-E) amplifiers are
installed in all nodes.
• The OPT-PRE amplifier switches to control power whenever the span loss is higher than 27 dB.
See Table 18-2 for a list of cards in each class. A dash (—) indicates spans that are not supported.
E 2.5 Gbps TXP_MR_2.5G—3R payload data type; FEC disabled
TXPP_MR_2.5G—3R payload data type; FEC disabled
MXP_MR_2.5G
MXPP_MR_2.5G
F 2.5 Gbps TXP_MR_2.5G—2R payload data type
TXPP_MR_2.5G—2R payload data type
G 2.5 Gbps OC-48 ELR ITU
H 2.5 Gbps 2/4 port Gigabit Ethernet Transponder (GBIC WDM 100 GHz)
I 10 Gbps TXP_2.5G_10E—E-FEC
1
enabled
TXP_MR_10E—E-FEC enabled
1. Forward error correction
Table 18-2 ONS 15454 Client Card Classes (continued)
Class Rate Clients
Table 18-3 Span Loss for 32-Channel Ring and Linear Networks with OADM Nodes Using SMF Fiber
Number of
Spans
10 Gbps 2.5 Gbps
Class A Class B Class C Class I Class D Class E Class F Class G Class H Class J
1 35 dB 25 dB 25 dB 37 dB 37 dB 33 dB 30 dB 32 dB 34 dB 30 dB
2 29 dB 21 dB 20 dB 30 dB 31 dB 27 dB 25 dB 26 dB 28 dB 25 dB
3 26 dB 17 dB 15 dB 28 dB 29 dB 25 dB 23 dB 24 dB 26 dB 23 dB
4 24 dB — — 25 dB 26 dB 23 dB 20 dB 22 dB 24 dB 20 dB
5 23 dB — — 24 dB 25 dB 22 dB 16 dB 20 dB 23 dB 16 dB
6 21 dB — — 23 dB 24 dB 19 dB — 17 dB 21 dB —
720
1
dB
1. 0.5 dB of OSNR impairment recovered by FEC margin @ BER > 10-6
— — 22 dB 23 dB 16 dB — — 19 dB —
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