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Cisco ONS 15454 DWDM Engineering and Planning Guide, Release 7.x
July 2006
Chapter 2 Cards Specifications
2.1 Card Overview
• Transponder (TXP) and muxponder (MXP) cards convert the “gray” optical client interface signals
into trunk signals that operate in the “colored” DWDM wavelength range. Transponding or
muxponding is the process of converting the signals between the client and trunk wavelengths.
A muxponder generally handles several client signals. It aggregates, or multiplexes, lower- rate
client signals together and sends them out over a higher-rate trunk port. Likewise, a muxponder
demultiplexes optical signals coming in on a trunk and sends the signals out to individual client
ports. A transponder converts a single client signal to a single trunk signal and converts a single
incoming trunk signal to a single client signal.
All of the TXP and MXP cards perform optical-to-electrical-to-optical (OEO) conversion. As a
result, they are not optically transparent cards. OEO conversion is necessary because the cards must
operate on the signals passing through the cards.
However, the termination mode for all TXPs and MXPs can be configured as transparent
(termination is performed at the electrical level). In a transparent termination, neither the Line nor
the Section overhead is terminated. The cards can also be configured so that Line overhead, Section
overhead, or both Line and Section overhead can be terminated.
Note When configured in the transparent termination mode, the MXP_2.5G_10G card does terminate some
bytes by design.
Table 2-5 describes the Cisco ONS 15454 DWDM cards. Client-facing gray optical signals generally
operate at shorter wavelengths, whereas DWDM colored optical signals are in the longer wavelength
range (for example, 1490 nm = violet; 1510 nm = blue; 1530 nm = green; 1550 nm = yellow; 1570 nm
= orange; 1590 nm = red; 1610 nm = brown). Some of the newer client-facing SFPs, however, operate
in the colored region.
Band 54.1 (G) B54.1 1554.13
Band 58.1 (H) B58.1 1558.17
Table 2-4 AD-4B-xx.x Channel Sets
Band IDs Add/Drop Channel IDs Add/Drop Wavelengths (nm)