8-20
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 8 Transponder and Muxponder Cards
8.6 TXP_MR_2.5G and TXPP_MR_2.5G Cards
8.6 TXP_MR_2.5G and TXPP_MR_2.5G Cards
The TXP_MR_2.5G card processes one 8-Mbps to 2.488-Gbps signal (client side) into one 8-Mbps to
2.5-Gbps, 100-GHz DWDM signal (trunk side). It provides one long-reach STM-16/OC-48 port per
card, compliant with ITU-T G.707, ITU-T G.709, ITU-T G.957, and Telcordia GR-253-CORE.
The TXPP_MR_2.5G card processes one 8-Mbps to 2.488-Gbps signal (client side) into two 8-Mbps to
2.5-Gbps, 100-GHz DWDM signals (trunk side). It provides two long-reach STM-16/OC-48 ports per
card, compliant with ITU-T G.707, ITU-T G.957, and Telcordia GR-253-CORE.
The TXP_MR_2.5G and TXPP_MR_2.5G cards are tunable over four wavelengths in the 1550-nm,
ITU 100-GHz range. They are available in eight versions, each of which covers four wavelengths, for a
total coverage of 32 different wavelengths in the 1550-nm range.
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 (retime, regenerate) and 3R (retime,
reshape, and regenerate) 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 8-9 shows the possible combinations of client interfaces, input bit rates, 2R and
3R modes, and ITU-T G.709 monitoring.
Table 8-9 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
connectivity (FICON)
2.125 Gbps 3R
1
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 —
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