Cisco RF Gateway Series

Cisco RF Gateway Downstream 48-1G Universal Edge QAM Line Card

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Product Overview

The Cisco® RF Gateway Downstream 48-1G Universal Edge QAM Line Card is a 12-port, 48-channel universal edge quadrature amplitude modulation (UEQAM) modulator designed for operation in the Cisco RF Gateway 10 platform. This line card is very similar in function to the standalone Cisco RF Gateway 1 Universal Edge QAM product, but the Cisco RF Gateway 10 can accommodate up 10x the density of the Cisco RF Gateway 1.

The Cisco RF Gateway Downstream 48-1G UEQAM line card offers concurrent support for standard and high-definition digital broadcast television, switched digital video (SDV), video-on-demand (VoD), and DOCSIS® modular cable modem termination system (M-CMTS) services. Cable operators can choose to configure the line card as a DOCSIS only, video only, or DOCSIS and video shared universal edge QAM.

In the 10-slot Cisco RF Gateway 10 platform, RF Gateway Downstream 48-1G UEQAM line cards (Figure 1) can be configured with 1:N redundancy (up to 1:9), resulting in a fully protected, high-capacity, and highly dense edge QAM solution. For video services, the line cards can accept multiple formats of video content and provide a wide range of video processing features. Leading-edge RF technology is used to perform QAM modulation and RFupconversion, at significant space and power savings compared to existing upconverter architectures.

Figure 1. RF Gateway Downstream 48-1G Universal Edge QAM Line Card

DS48 linecard picture


Broadcast video



Standard and high-definition digital video


Features and Benefits

Table 1 lists the features and benefits of the RF Gateway Downstream 48-1G UEQAM line card.

Table 1. Features and Benefits




Concurrent support for Digital Video Broadcast, SDV, and VoD
Supports a very wide variety of video solution architectures
Concurrent support for standard and high-definition services
Achieves greater investment protection through the flexibility to evolve as service and capacity requirements change
Concurrent support for multiple video encoding formats, including MPEG-2 and MPEG-4/H.264
Can maximize QAM channel utilization
Table-based and session-based edge QAM operation
Helps ensure a smooth transition from current video system architectures to future video system architectures


Designed to meet CableLabs DOCSIS 3.0 and M-CMTS specifications
Industry-recognized common specifications with tested multivendor interoperability
Fully tested with the Cisco uBR10012 M-CMTS solution
Full-featured and tested end-to-end M-CMTS solution offering stability, scalability, and availability

Universal Edge QAM

Concurrent support for video and DOCSIS on the same line card
Supports amortization of expenditure for video and DOCSIS edge QAM resources by sharing a common platform and universal edge QAM line card
Standards-based universal edge QAM resource management
Designed to support CableLabs defined universal edge QAM specification for multiple vendor interoperability
Concurrent support for Annex A, B, and C operations on the same line card
Can support mixed annex environments on the same line card with granularity per port (for example, Annex B for DOCSIS, Annex A for video)
48 QAM channels per line card, up to 10 line cards per RF Gateway 10 chassis (up to 480 QAMs per chassis)
High-capacity edge QAM solution reduces the total number of devices to manage and provides more scalable management than multiple standalone edge QAMs

High Availability

Supports high availability for universal edge QAM applications
Industry’s first carrier-class edge QAM platform provides continuous service availability and reduces the duration of planned service outages

Operations and Management

Software based on QNX microkernel-based real-time, high-performance operating system
As in the Cisco Carrier Routing System 1 (CRS-1) series of products, QNX is the basis of the Cisco RF Gateway Downstream 48-1G EUQAM software architecture, providing a very stable, scalable, and efficient operating system

Product Specifications

Table 2 gives product specifications for the Cisco RF Gateway Downstream 48-1G EQAM line card. Table 3 lists system requirements.

Table 2. Product Specifications



Hardware Specifications


Occupies a single RF slot in the Cisco RF Gateway 10 chassis

RF ports

12 RF ports with up to four contiguous QAM channels per port for a total of 48 QAMs


1.28 x 15.35 x 15 in. (33 x 390 x 381 mm) (H x W x D)


9.5 lb (4.32 kg)

Power consumption

180W maximum (3.75W per QAM); 165W typical (3.44W per QAM)


Operating altitude: -60 to 3000m
Storage temperature: -40 to 158°F (-40 to 70°C)
Operating temperature, nominal: 32 to 104°F (0 to 40°C)
Operating relative humidity: 10 to 85%, noncondensing


Status, alarm, traffic, Gigabit Ethernet (GE) port link, and activity

Ethernet Uplink Interfaces


2 GE

Uplink optic types

Small Form Factor Pluggable (SFP) GE

Small Form Factor Pluggables Supported

Gigabit Ethernet interfaces


Video Specifications

Video format

MPEG-2 SPTS and MPTS encapsulated in UDP/IP (RFC-768)
Up to seven 188-byte MPEG-2 packets per UDP datagram
MPEG-2 and MPEG-4/H.264 content
Standard and high definition

Video processing

PID remapping
PCR restamping
PSI extraction, generation, and insertion
Dejitter (up to 200 ms)
MPTS passthrough
Stream replication
Session statistics

Video redundancy

Redundant source failover
Link redundancy

Video monitoring

ASI video monitor port
BNC-type connector
Monitor any output MPTS


IP multicast routing protocols: Protocol Independent Multicast (PIM), including sparse mode and dense mode
Source Specific Multicast (SSM) and Any-Source Multicast (ASM)
Internet Group Management Protocol (IGMP)

Dejitter buffering

200 ms, configurable

TS bit rate


ASI monitor port

BNC type connector

Signaling mode

Table-based or session-based functionality
Support for up to 1440 streams

Maximum unique video multicast sessions

2048 load balanced

DOCSIS Specifications

CableLabs specifications supported

Downstream RF Interface (DRFI) CM-SP-DRFI
Downstream External PHY Interface (DEPI)
DOCSIS Timing Interface (DTI)
M-CMTS Operations Support System Interface (OSSI)

RF Specifications

Channel encoding

Randomization, Reed-Solomon, trellis encoding, and interleaving configurable to ITU-T J.83 Annex A, B, or C

QAM constellations

64 and 256 QAM

QAM stacking

Contiguous, quad-stacked QAM channel block

Symbol rate

3.5 Msym per second to 7 Msym per second

Bits per symbol

6 bits per symbol and 8 bits per symbol

Frequency plan


Center frequency range

57 to 999 MHz

Step size

1 kHz

Channel spacing

6 MHz and 8 MHz

MER (unequalized and equalized)

≥35 dB and ≥43 dB (at RF)

Output impedance

75 ohms

Return loss

>14 dB: 45-750 MHz
>13 dB: 750-870 MHz
>12 dB: 870-1000 MHz

Channel power - 1-channel mode (single QAM stacking)

+61 dBmV RMS maximum per QAM channel in 0.2 dB steps

Channel power - 2-channel mode (dual QAM stacking)

+57 dBmV RMS maximum per QAM channel in 0.2 dB steps

Channel power - 4-channel mode (quad QAM stacking)

+53 dBmV RMS maximum per QAM channel in 0.2 dB steps

Power accuracy

± 2 dB

Channel power delta in 4-QAM block

<1 dB

RF channel muting

≥73 dB

Phase noise

1 KHz-10 KHz: 33 dBc double sideband
10 KHz-50 KHz: 51 dBc double sideband
50 KHz-3MHz: 51 dBc double sideband

Out-of-band noise and spurious emissions

-60 dBc or better


± 3 ppm

Table 3. System Requirements



Chassis compatibility

Cisco RFGW-10


Cisco IOS® Software version 12.2(50)SQ1

Regulatory Compliance

Table 4 provides information about regulatory compliance.

Table 4. Regulatory Compliance



Network Equipment Building Standards (NEBS) and European Telecommunications Standards Institute (ETSI)

UL 60950CAN/CSA-C22.2 No. 60950, EN 60950, IEC 60950, TS 001, AS/NZS 3260

Electromagnetic compatibility (EMC)

FCC Part 15 (CFR 47) Class A, ICES-003 Class A, EN55022 Class A, AS/NZS CISPR22 Class A, AS/NZS 3548 Class A, VCCI Class A, ETS 300 386, EN 55022, KN22, EN 61000-3-2, EN 61000-3-3

Electromagnetic interference (EMI)

EN550082-1, EN55024, EN61000-4-2, EN61000-4-3, EN61000-4-5, EN61000-4-6, EN61000-4-8, EN61000-4-11, EN61000-6-1


GR-1089-Core Level 3, ETS 300 019 Storage Class 1.1, ETS 300 019 Transportation Class 2.3 (pending), ETS 300 019 Stationary Use Class 3.1, ETS 300 386

Industry EMC, safety, and environmental standards

Designed to meet NEBS standard GR-63-CORE and GR-1089-CORE

Other industry standards

Cisco corporate compliance standards

Ordering Information

Table 5 lists ordering information. To place an order, visit the Cisco Ordering Homepage. To download software, visit the Cisco Software Center.

Table 5. Ordering Information for the Cisco RF Gateway Downstream 48-1G UEQAM Line Card

Product Name and ID

Product Description

Cisco RF Gateway Series Line Cards


RFGW Universal Downstream Universal Edge QAM Card, 12 RF ports, 48 QAMs


RFGW Universal Downstream Universal Edge QAM Card, 12 RF ports, 48 QAMs spare

Cisco RF Gateway Series Transceiver Modules


1000BASE-T SFP (NEBS 3 ESD) (100 m on Cat5 UTP)


1000BASE-SX short wavelength, with DOM (550m on MMF)


1000BASE-LX/LH short wavelength, with DOM (10 km on SMF)

Cisco RF Gateway Series Accessories


RFGW line card cover


RFGW line card cover spare

Service and Support

Using the Cisco lifecycle services approach, Cisco and its partners provide a broad portfolio of end-to-end services and support that can help increase your network’s business value and return on investment. This approach defines the minimum set of activities needed, by technology and by network complexity, to help you successfully deploy and operate Cisco technologies and optimize their performance throughout the lifecycle of your network.

For More Information

For more information about the Cisco RF Gateway series, visit or contact your local account representative.