8-21
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 8 Transponder and Muxponder Cards
8.6.1 Faceplate
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 8-10 lists the calculated trunk bit rates for the client interfaces with
ITU-T G.709 enabled.
For 2R operation mode, the TXP_MR_2.5G and TXPP_MR_2.5G cards have the ability to pass data
through transparently from client side interfaces to a trunk side interface, which resides on an ITU grid.
The data might vary at any bit rate from 200-Mbps up to 2.38-Gbps, including ESCON and video signals.
In this pass-through mode, no performance monitoring (PM) or digital wrapping of the incoming signal
is provided, except for the usual PM outputs from the SFPs. Similarly, this card has the ability to pass
data through transparently from the trunk side interfaces to the client side interfaces with bit rates
varying from 200-Mbps up to 2.38-Gbps. Again, no PM or digital wrapping of received signals is
available in this pass-through mode.
For 3R operation mode, the TXP_MR_2.5G and TXPP_MR_2.5G cards apply a digital wrapper to the
incoming client interface signals (OC-N/STM-N, 1G-FC, 2G-FC, GE). PM is available on all of these
signals except for 2G-FC, and varies depending upon the type of signal. For client inputs other than
OC-48/STM-16, a digital wrapper might be applied but the resulting signal is not ITU-T G.709
compliant. The card applies a digital wrapper that is scaled to the frequency of the input signal.
The TXP_MR_2.5G and TXPP_MR_2.5G cards have the ability to take digitally wrapped signals in
from the trunk interface, remove the digital wrapper, and send the unwrapped data through to the client
interface. PM of the ITU-T G.709 OH and SONET/SDH OH is implemented.
8.6.1 Faceplate
Figure 8-14 shows the TXP_MR_2.5G and TXPP_MR_2.5G faceplates.
ISC-1 Compat 1.06 Gbps 3R Off
ISC-3 1.06 or
2.125 Gbps
2R —
ETR_CLO 16 Mbps 2R —
1. No monitoring
Table 8-9 2R and 3R Mode and ITU-T G.709 Compliance by Client Interface (continued)
Client Interface Input Bit Rate 3R vs. 2R ITU-T G.709
Table 8-10 Trunk Bit Rates With ITU-T G.709 Enabled
Client Interface ITU-T G.709 Disabled ITU-T G.709 Enabled
OC-48/STM-16 2.488 Gbps 2.66 Gbps
2G-FC 2.125 Gbps 2.27 Gbps
GE 1.25 Gbps 1.34 Gbps
1G-FC 1.06 Gbps 1.14 Gbps
OC-12/STM-3 622 Mbps 666.43 Mbps
OC-3/STM-1 155 Mbps 166.07 Mbps
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