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Chapter 1
Overview
modulation and frequency upconversion. From a high level, the DS-48 line card receives Video and
DOCSIS data encapsulated over Ethernet and outputs analog QAM data to the subscriber devices (STB,
DOCSIS modems).
As a DOCSIS engine, the DS-48 line card supports DEPI D-MPT mode (future SW releases may support
PSP mode). DEPI is based on the L2TPv3 protocol, which includes a data plane and a control plane.
DEPI data plane traffic is terminated at the line card. The Cisco RFGW-10 Supervisor terminates DEPI
control and communicates the control to each line card in the system via the chassis IPC infrastructure.
DOCSIS timing information (10.24MHz synchronous DTI clock) is received by the line card from the
system TCC cards.
As a video engine, the DS-48 terminates video data path traffic forwarded from the Supervisor Engine
(video control plane traffic is terminated and processed by the system Supervisor). The DS-48
processing path classifies video packets, performs inter QAM processing, bitrate scheduling, program
muxing/scheduling, PID remapping, PCR re-stamping, and CC re-stamping.
A critical feature for the DS-48 line card is redundancy and high availability support. The line cards are
designed to detect and react to a wide range of faults and failures and respond with sub-second failover
to a dedicated protect card.
The DS-48 line card is designed to support a wide range of line card health conditions and initiate
failover events if considered catastrophic:
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The DS-48 line card has 12 physical RF ports, which support up to four QAMs per port. The number of
QAM outputs is configurable on a per port basis (meaning an individual port can support 1, 2, or 4 QAMs
as well as muting of individual QAMs within a QAM group). In stacked QAM mode, the QAMs are
stacked contiguously over a 24-MHz or 32-MHz band. The line card supports a downstream channel
frequency range of 88 MHz to 870 MHz.
The front panel includes two 1xGE ports and a single DVB-ASI interface (covers all video output
streams). The front panel connectors support both copper and fiber SFP modules. The front panel GE
ports are not processed directly by the line card, these are independent of the line card and route directly
to the Supervisor switch fabric. These ports do not become out of service if the line card crashes and a
failover to the redundant card occurs.
DS-48 Line Card Components
The following connectors and LEDs are located on the front panel of the DS-48 line card:
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OL-16264-04
QAM/upconverter HW failure. The line card monitors both the digital and RF data integrity. The
modules also provide a comprehensive alarm structure to the system CPU, which allows constant
monitoring of the UPX.
Environmental alarms (temperature, voltage, frequency).
Software kernel failures.
Software module failure.
DTI Clock/Timing failures (both internal and external).
SFP failures.
STATUS LED that indicates the operating state of the line card
ALARM LED that indicates the general health of the line card
TRAFFIC LED that indicates whether the card is a primary (working card) or a protect card
LINK LED that indicates whether the link is operational
DVB-ASI BNC Coax Interface
Cisco RF Gateway 10 Hardware Installation Guide
Cisco RFGW-10 Components
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