37 distinct OC-48 ITU 100 GHz dense wavelength division multiplexing (DWDM) cards provide the ONS 15454 DWDM channel plan. Each OC-48 DWDM card provides one Telcordia-compliant, GR-253 SONET OC-48 port. The port operates at 2.48 Gbps over a single-mode fiber span. The card carries VT, concatenated, and non-concatenated payloads at STS-1, STS-3c, STS-6c, STS-12c or STS-48c signal levels.You can install the OC-48 ELR DWDM cards in any high-speed slot and provision this card as part of a bi-directional line switched ring (BLSR) or unidirectional path switched ring (UPSR). The card can serve as either an access tributary or a transport span interface. The OC-48/STM-16 ELR 100 GHz card requires a cross-connect (XC) card or cross-connect virtual tributary (XCVT) card for proper operation.Each OC-48 ELR DWDM card uses extended long reach optics operating individually within the ITU-T 100 GHz grid. The OC-48 DWDM 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 Cisco ONS 15216 erbium-doped fiber amplifiers (EDFAs).Maximum system reach in filterless applications is 26 dB 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. When used in combination with ONS 15216 100 GHz filters, a 2dB power penalty reduces the link budget to 24 dB. The OC-48 ELR DWDM cards feature wavelength stability of +/- 0.08 nm. Each interface contains a transmitter and receiver.The OC-48 ELR cards detect loss of signal (LOS), loss of frame (LOF), loss of pointer (LOP), and line-layer alarm indication signal (AIS-L) conditions. The cards also count section and line BIT errors.