8-2
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 8 Transponder and Muxponder Cards
8.1 Card Overview
• 8.16 Termination Modes, page 8-78
• 8.17 SFP and XFP Modules, page 8-79
8.1 Card Overview
The card overview section lists the cards described in this chapter and provides compatibility
information.
Note Each card is marked with a symbol that corresponds to a slot (or slots) on the ONS 15454 shelf assembly.
The cards are then installed into slots displaying the same symbols. See the “1.16.1 Card Slot
Requirements” section on page 1-61 for a list of slots and symbols.
The purpose of a TXP, MXP, GE_XP, 10GE_XP, or ADM-10G card is to convert the “gray” optical client
interface signals into trunk signals that operate in the “colored” dense wavelength division multiplexing
(DWDM) wavelength range. 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.
Transponding or muxponding is the process of converting the signals between the client and trunk
wavelengths.
An MXP 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, it demultiplexes optical signals
coming in on a trunk and sends them out to individual client ports. A TXP converts a single client signal
to a single trunk signal and converts a single incoming trunk signal to a single client signal. GE_XP and
10GE_XP cards can be provisioned as TXPs, as MXPs, or as Layer 2 switches.
All of the TXP and MXP cards perform optical to electrical to optical (OEO) conversion. As a result,
they are not optically transparent cards. The reason for this is that the cards must operate on the signals
passing through them, so it is necessary to do an OEO conversion.
On the other hand, the termination mode for all of the TXPs and MXPs, which is done at the electrical
level, can be configured to be transparent. In this case, neither the Line nor the Section overhead is
terminated. The cards can also be configured so that either Line or Section overhead can be terminated,
or both can be terminated.
Note The MXP_2.5G_10G card, by design, when configured in the transparent termination mode, actually
does terminate some of the bytes. See Table 8-39 on page 8-79 for details.
8.1.1 Card Summary
Table 8-1 lists and summarizes the functions of each TXP, TXPP, MXP, and MXPP card.
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