Cisco ONS 15454 DWDM - Table 16-54 2 R and 3 R Mode and ITU-T G.709 Compliance by Client Interface

16-89
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
April 2006
Chapter 16 Card Reference
16.8.3 TXP_MR_2.5G and TXPP_MR_2.5G Cards
Note ITU-T G.709 specifies a form of FEC that uses a “wrapper” approach. The digital wrapper lets you
transparently take in a signal on the client side, wrap a frame around it, and restore it to its original form.
FEC enables longer fiber links because errors caused by the optical signal degrading with distance are
corrected.
The trunk/line port operates at up to 2.488 Gbps (or up to 2.66 Gbps with ITU-T G.709 Digital
Wrapper/FEC) over unamplified distances up to 360 km (223.7 miles) with different types of fiber such
as C-SMF or higher if dispersion compensation is used.
Caution Because the transponder has no capability to look into the payload and detect circuits, a TXP_MR_2.5G
or TXPP_MR_2.5G card does not display circuits under card view.
The TXP_MR_2.5G and TXPP_MR_2.5G cards support 2R and 3R modes of operation where the client
signal is mapped into a ITU-T G.709 frame. The mapping function is simply done by placing a digital
wrapper around the client signal. Only OC-48/STM-16 client signals are fully ITU-T G.709 compliant,
and the output bit rate depends on the input client signal. Table 16-54 shows the possible combinations
of client interfaces, input bit rates, 2R and 3R modes, and ITU-T G.709 monitoring.
The output bit rate is calculated for the trunk bit rate by using the 255/238 ratio as specified in
ITU-T G.709 for OTU1. Table 16-55 lists the calculated trunk bit rates for the client interfaces with
ITU-T G.709 enabled.
Table 16-54 2R and 3R Mode and ITU-T G.709 Compliance by Client Interface
Client Interface Input Bit Rate 3R vs. 2R ITU-T G.709
OC-48/STM-16 2.488 Gbps 3R On or Off
DV-6000 2.38 Gbps 2R —
2 Gigabit Fibre Channel (2G-FC)/fiber connection
(FICON)
2.125 Gbps 3R
1
1. No monitoring
On or Off
High-Definition Television (HDTV) 1.48 Gbps 2R —
Gigabit Ethernet (GE) 1.25 Gbps 3R On or Off
1 Gigabit Fibre Channel (1G-FC)/FICON 1.06 Gbps 3R On or Off
OC-12/STM-4 622 Mbps 3R On or Off
OC-3/STM-1 155 Mbps 3R On or Off
Enterprise System Connection (ESCON) 200 Mbps 2R —
SDI/D1 video 270 Mbps 2R —
ISC-1 Compact 1.06 Gbps 3R Off
ISC-3 1.06 or
2.125 Gbps
2R —
ETR_CLO 16 Mbps 2R —