Feature Overview, Attenuation | Cisco Systems uBR10-SRP-OC12SML

Cisco uBR10-SRP-OC12SML DPT WAN Line Card for the Cisco uBR10012 Router

Feature Overview

The Cisco uBR10 Spatial Reuse Protocol (SRP) OC12 single-mode fiber, long reach (SML) dynamic packet transport (DPT) WAN line card provides shared IP over SONET capability for the

Cisco uBR10012 router platform.

The Cisco uBR10-SRP-OC12SML DPT WAN line card:

•Accommodates large scale network topology.

The WAN card is deployed in SONET OC-12 DPT rings. The DPT rings are connected to SONET Add Drop Multiplexers (ADMS) allowing the creation of small or very large rings. Each DPT ring supports a maximum of 64 nodes.

•Leverages fiber optics capacity at OC-12c line rates.

The WAN card has two SC duplex ports. Each SC duplex port provides the physical connection to an adjacent device in a DPT ring.

•Supports single mode fiber transmissions.

•Allows data to obtain fair-shared access to the OC-12c rings.

•Supports Version 1 SRP Protocol

•Implements protection mechanisms, including wrap and unwrap, in the event of fiber or node failure.

The Cisco uBR10-SRP-OC12SML DPT WAN line card requires two card slots. For that reason, the card is normally installed in Slot 2 and Slot 4 if you are using two cards. If you are using only one card than install the card in Slot 2, Slot 3 or Slot 4. See Figure 1.

Attenuation

The Cisco uBR10-SRP-OC12SML DPT WAN line card is designed to be used at any distance between 15 and 40 kilometers (km). For shorter distance operations (less than 15 km), use a 10 dBm optical attenuator on the link (see Figure 6 on page 7) between the two nodes to prevent clipping and over saturation of the optical receiver. The attenuator should be made of a non-metallic or plastic material.

The exact attenuation value is based on the real cable length or the number of couplers and splicers on the link. For example, 5 dBm attenuator could be used in a 7 km link.

Note The maximum distance of 40 km assumes that the 1310 nm SMF optical cable attenuation is no more than 0.5dB per kilometer; and that there is no optical coupler or splicer in on the link (each could add 0.5dB loss).

Cisco recommends the use of a SC/PC female to SC/PC male optical attenuator.

Tip The SC/PC (Standard Connector/Physical Contact) denotes a connector with a rectangular shape. The surfaces are parallel with respect to the port (not angled). SC/APC (Standard Connector Angled Physical Contact) denotes an angled surface.

Cisco uBR10-SRP-OC12SML DPT WAN Line Card

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