Technical Specifications

This appendix contains the following technical specifications for the Cisco uBR924 cable access router:

Physical, Power, and Environmental Specifications

Table A-1 lists the Cisco uBR924 cable access router physical specifications and power requirements.

Table A-1: Cisco uBR924 Cable Access Router Physical Specifications

Description Specification

Dimensions (H x W x D)

2.30 x 13 x 9.30 in. (5.842 x 33.02 x 24.77 cm)

Weight

3 lb (1.36 kg)
1 lb (0.45 kg) for the AC-input external power supply

AC-input voltage

120 to 240 VAC¹ wide input with power factor correction

AC-input current rating

1.2A² maximum at 120 VAC and 0.6A maximum at 240 VAC

AC-input cable

18 AWG³ 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.

Power dissipation

12 to 15W

Frequency

50/60 Hz⁴

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 dBa⁵ maximum at desktop, 43 dBa maximum in an office

Software requirement

Cisco uBR924 cable access router software---Cisco IOS Release 12.0(4)XI or higher

Agency approvals

Safety: UL 1950, CSA 22.2 No. 950, EN60950, IEC60950, AS/NZS3260, TS001
EMI: FCC Class A, FCC Class B, CSA Class A, EN60555-2, EN55022 Class B, VCC1 Class 2, AS/NZS 3548
Class A Immunity: IEC-1000-4-2, IEC-1000-4-3, IEC-1000-4-4, IEC-1000-4-5, IEC-1000-4-6, IEC-1000-4-11, IEC-1000-3-2, IEC 60950, AS3260, TS001

See also "Regulatory Compliance and Safety Information."

¹VAC = volts alternating current.
²A = ampere.
³AWG = American Wire Gauge.
⁴Hz = hertz.
⁵dBa = adjusted decibels.

Description	Specification
Dimensions (H x W x D)	2.30 x 13 x 9.30 in. (5.842 x 33.02 x 24.77 cm)
Weight	3 lb (1.36 kg) 1 lb (0.45 kg) for the AC-input external power supply
AC-input voltage	120 to 240 VAC¹ wide input with power factor correction
AC-input current rating	1.2A² maximum at 120 VAC and 0.6A maximum at 240 VAC
AC-input cable	18 AWG³ 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.
Power dissipation	12 to 15W
Frequency	50/60 Hz⁴
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 dBa⁵ maximum at desktop, 43 dBa maximum in an office
Software requirement	Cisco uBR924 cable access router software---Cisco IOS Release 12.0(4)XI or higher
Agency approvals	Safety: UL 1950, CSA 22.2 No. 950, EN60950, IEC60950, AS/NZS3260, TS001 EMI: FCC Class A, FCC Class B, CSA Class A, EN60555-2, EN55022 Class B, VCC1 Class 2, AS/NZS 3548 Class A Immunity: IEC-1000-4-2, IEC-1000-4-3, IEC-1000-4-4, IEC-1000-4-5, IEC-1000-4-6, IEC-1000-4-11, IEC-1000-3-2, IEC 60950, AS3260, TS001 See also "Regulatory Compliance and Safety Information."

Data Specifications

Table A-2 lists the specifications for the Cisco uBR924 cable access router's data ports.

Table A-2: Cisco uBR924 Cable Access Router 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

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

42.8 Mbps/256 QAM
(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

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 -8 dBmV, SNR must be greater than 30 dB. For input level between -8 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). Since 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 a Cisco uBR904 and laboratory-controlled conditions.

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

Security

DES decryption: DOCSIS Baseline Privacy (BPI), 40-bit, 56-bit, and 168-bit DES encryption, as controlled by the headend and configuration files.

DES encryption

Note Cisco IOS images must contain encryption software at both the CMTS and the Cisco uBR924 router. Both routers must be enabled and properly configured to support encryption.

Voice Specifications

Table A-3 lists the specifications for the voice ports on the Cisco uBR924 cable access router.

Table A-3: Cisco uBR924 Cable Access Router Voice Specifications

Metric Value

Loss (between DCS and BTI gateway)

Nominal: 4 dB ±.5 dB (off hook)
Nominal: 9 dB ±.5 dB (on hook)

Attenuation distortion:
DCS <> BTI (200Hz-3.5kHz)
BTI<> DCS (304 Hz-3004Hz)
DCS -> BTI (204 Hz-3004 Hz)

Nominal:
+1 dB/-3 dB
±0.5 dB
±0.5 dB0

Idle channel noise

<= 18 dBmC (noise shall not exceed)

Signal to C-notched noise

>= 35 dB

Inter-modulation distortion:
R2
R3

>= 52 dB
>= 52 dB

Single frequency interference:
0 to 12 kHz
0 to 4 kHz

<= -28 dBmO
<= -40 dBmO

Frequency shift (offset)

<= ±0.2 Hz (max)
<= ±0.1 Hz (99.5%)

Amplitude tracking (input Level, dBmO):
-37 to 0 (on-hook)
-37 to +3 (off hook)
-50 to -37 (off-hook)
-55 to -50 (off-hook)

Max Dev. Ave. Dev.
<= ±.5 dB
<= ±.5 dB <= ±.25 dB
<= ±1.0dB <= ±.5 dB
<= ± 3.0 dB <= ±1.5 dB

Crosstalk

<= -65 dBmO

Amplitude jitter
20-300 Hz
4-300 Hz

<= 2.5% Peak
<= 2.9% Peak

Phase jitter
20 to 300 Hz
4 to 300 Hz

<= 1.5 P-P

<= 1.8 P-P

Envelope delay distortion:
1704 Hz to 604 Hz
1704 Hz to 2804 Hz
1704 Hz to 204 Hz
1704 Hz to 3404 Hz

<= 350 usec
<= 195 usec
<= 580 usec
<= 400 usec

Hybrid balance:

Echo Return Loss (ERL)

SRL

> 26 dB (standard test line)
> 14 dB (station off hook)

> 21 dB (standard test line)
> 11 dB (station off hook)

Clipping:
Speech segments <5 ms
Speech segments > 5ms

< 0.5%
0.0%

Impulse noise:
(>= 6 dB below receive signal)

0 in 93% of all 15 min intervals
<= 1 count in all 30 min intervals

Phase hits (>= 10 deg)

0 in 99.75% of all 15 min intervals
<= 1 count in all 30 min intervals

Gain hits (>= ± 3dB)

0 in 99.9% of all 15 min intervals
<= 1 count in all 30 min intervals

Dropouts (>= 12)

0 in 99.9% of all 15 min intervals
<= 1 count in all 60 min intervals

Ringer voltage and frequency

52 VRMS (max, short loop, balanced ringing) at a default of 20 Hz---the frequency can be changed using the voice-port ring frequency configuration command.

Port terminating impedance

600 ohms (default)---this can be changed using the voice-port impedance configuration command.

Metric	Value
Loss (between DCS and BTI gateway)	Nominal: 4 dB ±.5 dB (off hook) Nominal: 9 dB ±.5 dB (on hook)
Attenuation distortion: DCS <> BTI (200Hz-3.5kHz) BTI<> DCS (304 Hz-3004Hz) DCS -> BTI (204 Hz-3004 Hz)	Nominal: +1 dB/-3 dB ±0.5 dB ±0.5 dB0
Idle channel noise	<= 18 dBmC (noise shall not exceed)
Signal to C-notched noise	>= 35 dB
Inter-modulation distortion: R2 R3	>= 52 dB >= 52 dB
Single frequency interference: 0 to 12 kHz 0 to 4 kHz	<= -28 dBmO <= -40 dBmO
Frequency shift (offset)	<= ±0.2 Hz (max) <= ±0.1 Hz (99.5%)
Amplitude tracking (input Level, dBmO): -37 to 0 (on-hook) -37 to +3 (off hook) -50 to -37 (off-hook) -55 to -50 (off-hook)	Max Dev. Ave. Dev. <= ±.5 dB <= ±.5 dB <= ±.25 dB <= ±1.0dB <= ±.5 dB <= ± 3.0 dB <= ±1.5 dB
Crosstalk	<= -65 dBmO
Amplitude jitter 20-300 Hz 4-300 Hz	<= 2.5% Peak <= 2.9% Peak
Phase jitter 20 to 300 Hz 4 to 300 Hz	<= 1.5 P-P <= 1.8 P-P
Envelope delay distortion: 1704 Hz to 604 Hz 1704 Hz to 2804 Hz 1704 Hz to 204 Hz 1704 Hz to 3404 Hz	<= 350 usec <= 195 usec <= 580 usec <= 400 usec
Hybrid balance: Echo Return Loss (ERL) SRL	> 26 dB (standard test line) > 14 dB (station off hook) > 21 dB (standard test line) > 11 dB (station off hook)
Clipping: Speech segments <5 ms Speech segments > 5ms	< 0.5% 0.0%
Impulse noise: (>= 6 dB below receive signal)	0 in 93% of all 15 min intervals <= 1 count in all 30 min intervals
Phase hits (>= 10 deg)	0 in 99.75% of all 15 min intervals <= 1 count in all 30 min intervals
Gain hits (>= ± 3dB)	0 in 99.9% of all 15 min intervals <= 1 count in all 30 min intervals
Dropouts (>= 12)	0 in 99.9% of all 15 min intervals <= 1 count in all 60 min intervals
Ringer voltage and frequency	52 VRMS (max, short loop, balanced ringing) at a default of 20 Hz---the frequency can be changed using the voice-port ring frequency configuration command.
Port terminating impedance	600 ohms (default)---this can be changed using the voice-port impedance configuration command.

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