Technical Specifications

This appendix contains the following technical specifications for the Cisco uBR910 series cable data service unit (DSU):

Physical, Power, and Environmental Specifications

Table A-1 lists the Cisco uBR910 series DSU physical specifications and power requirements.

Table A-1: Cisco uBR910 Series Physical Specifications

Description Specification

Dimensions (W x D x H)

Cisco uBR914: 17.5 x 11.25 x 1.7 in. (44.5 x 28.6 x 4.3 cm)

Weight

Cisco uBR914: 5 lb (2.49 kg)
1 lb (0.45 kg) for the AC-input external power supply

AC-Input Power Supply

Description Specification

AC-input voltage

120 to 240 VAC¹ wide input with power factor correction

AC-input current rating

1.5 A² maximum

AC-input Frequency

50/60 Hz³

AC-input power dissipation

20 W⁴

AC-input cable

18 AWG⁵ three-wire cable, with a three-lead receptacle on the power supply end, and a North American (NEMA 5-15P) plug on the power source end; other country-specific cords are available and supplied as ordered.

Redundant Power Supply Ratings

Description Specification

Input voltage

120 to 240 VAC input with power factor correction

Input current rating

10 A maximum

Input frequency

50/60 Hz

Redundant Power Supply Ratings

Description Specification

Absolute maximum input power

1000 W

Output voltage

5.0 VDC⁶ @ 4.0 A

Output power dissipation

28 W maximum

Environmental

Temperature

32° to 104° F (0 to 40° C) operating; -13° to 158° F (-25° to 70° C) nonoperating

Humidity

5 to 95% noncondensing

Noise level

38 dBa⁷ maximum at desktop, 43 dBa maximum in an office

Software requirement

Cisco uBR910 series DSU software---Cisco IOS Release 12.1(1)XD or higher supported releases

Agency approvals

Safety: UL 1950, CSA 22.2 No. 950, EN60950, IEC60950, AS/NZS3260, TS001
EMI: EN50082-1:1992, EN55022:1994 Class B, AS/NZS 3548:1995, VCCI 3197.04 Class B, 47 CFR 15 Subpart B, 1997 Class B
See also "Regulatory Compliance and Safety Information."

¹VAC = volts alternating current.
²A = ampere.
³Hz = hertz.
⁴W = watts
⁵AWG = American Wire Gauge.
⁶VDC = volts direct current
⁷dBa = adjusted decibels.

Data Specifications

Table A-2 lists the specifications for the Cisco uBR910 series data ports.

Table A-2: Cisco uBR910 Series Data Specifications

Description Downstream Values Upstream Values

Frequency Range

88 to 860 MHz

5 to 42 MHz

Modulation

64 QAM, 256 QAM

QPSK, 16 QAM

Data Rate

64 QAM---30 Mbps (27 Mbit/sec after FEC overhead)

256 QAM---42.8 Mbps (36 Mbit/sec after FEC overhead)

QPSK---320 Kbit/sec to 5 Mbit/sec

16 QAM---640 Kbit/sec to 10 Mbit/sec

Bandwidth

6 MHz

200K, 400K, 800K, 1.6M, 3.2 MHz

FEC

RS (122, 128) Trellis

One Channel

Receive level of digital signal
-15 to +15 dBmV

Note Most field measurements are of nearby or adjacent analog signal which is normally +6 to +10 dB (system specific) above the digital signal level

QPSK--- +8 to +58 dBmV

16 QAM--- +8 to +55 dBmV

Signal-to-Noise Ratio (SNR)

64 QAM:
>23.5 dB @ BER<10-^8

256 QAM*:
>30 dB @ BER <10^-8
(For input level between +15 and -6 dBmV, SNR must be greater than 30 dB. For input level between -6 and -15 dBmV, SNR must be greater than 33 dB.)

Note These performance numbers are in laboratory-controlled conditions, against statistically pure noise sources (AWGN). Because such conditions do not exist in practise, a 6 or more dB SNR margin is required for reliable operation. Check with your local system guidelines.

QPSK:
>15 dB @ BER<10^-8
(QPSK will work at 98% successful ping rate for SNR>13 dB. An SNR of 15 dB will be needed to get almost optimal packets per minute transition.)

16 QAM:
>22 dB @ BER <10^-8
(For 16 QAM, an SNR>22 dB makes the grade for 98% ping efficiency. To get good packet rate, you need SNR>25 dB)

Note These measurements were done for 0 and -10 dBmV input to the CMTS, 1280 ksym/sec and 64 bytes packet size with laboratory-controlled conditions.

Security

DES encryption: DOCSIS Baseline Privacy Interface (BPI), 40-bit and 56-bit DES encryption, as controlled by the headend and configuration files.

DES encryption

Note Both the CMTS and Cisco uBR910 series must support and enable BPI encryption.

Description	Specification
Dimensions (W x D x H)	Cisco uBR914: 17.5 x 11.25 x 1.7 in. (44.5 x 28.6 x 4.3 cm)
Weight	Cisco uBR914: 5 lb (2.49 kg) 1 lb (0.45 kg) for the AC-input external power supply
AC-Input Power Supply
Description	Specification
AC-input voltage	120 to 240 VAC¹ wide input with power factor correction
AC-input current rating	1.5 A² maximum
AC-input Frequency	50/60 Hz³
AC-input power dissipation	20 W⁴
AC-input cable	18 AWG⁵ three-wire cable, with a three-lead receptacle on the power supply end, and a North American (NEMA 5-15P) plug on the power source end; other country-specific cords are available and supplied as ordered.
Redundant Power Supply Ratings
Description	Specification
Input voltage	120 to 240 VAC input with power factor correction
Input current rating	10 A maximum
Input frequency	50/60 Hz
Redundant Power Supply Ratings
Description	Specification
Absolute maximum input power	1000 W
Output voltage	5.0 VDC⁶ @ 4.0 A
Output power dissipation	28 W maximum
Environmental
Temperature	32° to 104° F (0 to 40° C) operating; -13° to 158° F (-25° to 70° C) nonoperating
Humidity	5 to 95% noncondensing
Noise level	38 dBa⁷ maximum at desktop, 43 dBa maximum in an office
Software requirement	Cisco uBR910 series DSU software---Cisco IOS Release 12.1(1)XD or higher supported releases
Agency approvals	Safety: UL 1950, CSA 22.2 No. 950, EN60950, IEC60950, AS/NZS3260, TS001 EMI: EN50082-1:1992, EN55022:1994 Class B, AS/NZS 3548:1995, VCCI 3197.04 Class B, 47 CFR 15 Subpart B, 1997 Class B See also "Regulatory Compliance and Safety Information."

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