Universal Broadband Router Hardware Installation Guide

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Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
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Chapter 1 Cisco uBR10012 Universal Broadband Router Overview
Network Uplink Cards
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 short-distance operations (less than 15 km), use a 10 dBm optical
attenuator on the link between the two nodes to prevent clipping and oversaturating 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 0.5 dB per kilometer; and that there is no optical coupler or splicer in the link (each could add
0.5 dB loss).
Cisco recommends the use of a SC/PC female to SC/PC male optical attenuator for the
Cisco
uBR10-SRP-OC12SML DPT WAN line card.
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.
Caution Make sure that you obtain the correct connector type (SC/PC) when purchasing optical attenuators.
Angled SC/APC type mating surfaces can damage the Cisco uBR10-SRP-OC12SML DPT WAN line
card (RX port) interface.
See Optical Connectors and Cables, page 1-47.
Cisco uBR10012 OC-48 DPT/POS Interface Module
The Cisco uBR10012 OC-48 dynamic packet transport (DPT) and packet-over-SONET interface module
is a full-height line card for the Cisco
uBR10012 universal broadband router. This card provides trunk
uplink capabilities that support up to 1.4 Gbps full duplex throughput over a standard SONET/ITU-T
Synchronous Digital Hierarchy (SDH) interface, using a single mode fiber with SC connectors.
Two versions of the Cisco uBR10012 OC-48 DPT/POS interface module are available— short reach
(SR) or long reach (LR). Both versions work with the performance routing engine (PRE).
The Cisco uBR10012 OC-48 DPT/POS interface module provides a point-to-point connection to a
backbone router and encapsulates IP Packets with byte-wise HDLC framing, placing them directly into
the OC-48 SONET (or SDH) payload.
Ta b l e 1-23 Cable Specification
Fiber Type Wavelength, nm Core Size, microns Cable Distance
Single-mode fiber 1310 8 to 10 49,213 – 131,234 ft.
(15 – 40 km)