user manual

4-28
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 4 Optical Cards
4.10.1 OC48 ELR/STM16 EH 100 GHz Card Functionality
Figure 4-16 shows a block diagram of the card.
Figure 4-16 OC48 ELR/STM16 EH 100 GHz Block Diagram
4.10.1 OC48 ELR/STM16 EH 100 GHz Card Functionality
You can install the OC48 ELR/STM16 EH 100 GHz cards in Slot 5, 6, 12, or 13. You can provision this
card as part of a MS-SPRing or SNCP. In an ADM/TM configuration, you can provision the card as either
an access tributary or a transport span interface.
Nine of the cards operate in the blue band with a spacing of 2 * 100 GHz in the ITU grid (1530.33 nm,
1531.90 nm, 1533.47 nm, 1535.04 nm, 1536.61 nm, 1538.19 nm, 1539.77 nm, 1541.35 nm, and
1542.94 nm). The other nine cards operate in the red band with a spacing of 2 * 100 GHz in the ITU grid
(1547.72 nm, 1549.32 nm, 1550.92 nm, 1552.52 nm, 1554.13 nm, 1555.75 nm, 1557.36 nm,
1558.98 nm, and 1560.61 nm).
Each OC48 ELR/STM16 EH 100 GHz card uses extended long-reach optics operating individually
within the ITU 100-GHz grid. The OC48 ELR/STM16 EH 100 GHz cards are intended to be used in
applications with long unregenerated spans of up to 200 km (with mid-span amplification). These
transmission distances are achieved through the use of inexpensive optical amplifiers (flat gain
amplifiers) such as erbium-doped fiber amplifiers (EDFAs). Using collocated amplification, distances
up to 200 km can be achieved for a single channel (160 km for 8 channels).
Maximum system reach in filterless applications is 24 dB, or approximately 80 km, without the use
of optical amplifiers or regenerators. However, system reach also depends on the condition of the
facilities, number of splices and connectors, and other performance-affecting factors. The
OC48 ELR/STM16 EH 100 GHz cards feature wavelength stability of +/– 0.25 nm. Each port contains
a transmitter and a receiver.
The OC48 ELR/STM16 EH 100 GHz cards are the first in a family of cards meant to support extended
long-reach applications in conjunction with optical amplification. Using DFB laser technology, the
OC48 ELR/STM16 EH 100 GHz cards provide a solution at the lower extended long-reach distances.
uP bus
uP
Flash
RAM
BTC
ASIC
Optical
Transceiver
STM-16
Main SCI
Protect SCI
STM-16
63119
Mux/
Demux
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