Universal Broadband Router Hardware Installation Guide

1-32
Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
OL-18259-01
Chapter 1 Cisco uBR10012 Universal Broadband Router Overview
Cable Interface Line Cards
Cisco uBR10-LCP2-MC28C Cable Interface Line Card
The Cisco uBR10-LCP2-MC28C cable interface line card is a combination of two components:
• Cisco uBR-MC28C—Provides two downstreams and eight upstreams, divided into two domains.
The cards are functionally identical, but the Cisco
uBR-MC28C card uses industry-standard
F-connectors.
• Cisco Line Card Processor (Cisco uBR10-LCP2) adapter card—Provides the mechanical and
electrical conversions necessary for the Cisco
uBR-MC28C cable interface line card to fit the form
factor used in the Cisco
uBR10012 chassis.
Note Unless otherwise indicated, all references in this document to the Cisco uBR-MC28C and
Cisco uBR10-LCP2-MC28C line cards also refer to the BNC versions of these cards.
The Cisco uBR10-LCP2 adapter card and the Cisco uBR-MC28C line card are mechanically connected
to each other by means of brackets and a bus connector. The LCP not only adapts the Cisco
uBR-MC28C
line card to the form factor of the Cisco
uBR10012 chassis, but also provides the proper voltage
conversion for the card and chassis, the boot code required to use the Cisco
uBR-MC28C, and SDRAM
for buffering packets as they are transferred between the line card and PRE.
The two cards are inserted into and removed from the Cisco uBR10012 chassis as a single logical and
physical unit. The Cisco
uBR10-LCP2-MC28C cable interface line card supports Online Insertion and
Removal (OIR). The OIR uses the MAC address assigned to the adapter card, allowing you to replace a
Cisco
uBR-MC28C on a LCP2 adapter card without losing any configuration information.
Caution Do not attempt to separate or remove the Cisco uBR-MC28C card from the Cisco uBR10-LCP2 adapter
card while the two cards are inserted in the Cisco
uBR10012 chassis. The cards must be removed from
the chassis as a unit and then separated on a lab bench or other area that protects against ESD damage.
The Cisco uBR10-LCP2-MC28C cable interface line cards, together with external IF/RF upconverters,
serve as the RF interface between the cable headend and DOCSIS-based cable modems and set-top boxes
(STBs). The Cisco
uBR10-LCP2-MC28C cable interface line card supports 6 MHz National Television
Systems Committee (NTSC) channel operation, using standard (STD), Harmonic Related Carrier
(HRC), or Incremental Related Carrier (IRC) frequency plans conforming to EIA-S542. The card
supports downstream channels in the 54 to 860 MHz range with upstream ranges of 5 to 42 MHz.
The cards’ two downstream ports and eight upstream ports support the modulations shown in Table 1-13:
Default modulations:
• 64 quadrature amplitude modulations (QAM) for downstream
• quadrature amplitude phase-shift keying (QPSK) for upstream
The 256 QAM modulation can be used for the downstream and the 16 QAM modulation for the upstream
only if the cable plant can support the higher carrier-to-noise ratio (CNR) thresholds required for these
modulations.
Ta b l e 1-13 Modulation and Output Specifications for the Cisco uBR MC28C Cable Interface Line Card
Cable Modem Line Card Downstream Modulation Upstream Modulation Output
Cisco uBR10-LCP2-MC28C 64 QAM, 256 QAM QPSK, 16 QAM +42 dBMV +/– 2 dB