Cisco Systems UBR900 specifications Backup Pots Connection, Srl

			Voice Over IP Operations
Table 2	Cisco uBR924 Cable Access Router Voice Specifications (continued)
Metric		Value
Frequency shift (offset)		<= ±0.2 Hz (max)
		<= ±0.1 Hz (99.5%)
Amplitude tracking (input Level, dBmO):		Max Dev.	Ave. Dev.
-37 to 0 (on-hook)		<= ±.5 dB
-37 to +3 (off hook)		<= ±.5 dB	<= ± .25 dB
-50 to -37 (off-hook)		<= ±1.0dB	<= ±.5 dB
-55 to -50 (off-hook)		<= ± 3.0 dB	<= ±1.5 dB
Crosstalk		<= -65 dBmO
Amplitude jitter
20-300 Hz		<= 2.5% Peak
4-300 Hz		<= 2.9% Peak
Phase jitter		<= 1.5 P-P
20 to 300 Hz		<= 1.8 P-P
4 to 300 Hz
Envelope delay distortion:		<= 350 usec
1704 Hz to 604 Hz		<= 195 usec
1704 Hz to 2804 Hz		<= 580 usec
1704 Hz to 204 Hz		<= 400 usec
1704 Hz to 3404 Hz
Hybrid balance:
Echo Return Loss (ERL)		> 26 dB (standard test line)
		> 14 dB (station off hook)
SRL		> 21 dB (standard test line)
		> 11 dB (station off hook)
Clipping:
Speech segments <5 ms		< 0.5%
Speech segments > 5ms		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

Backup POTS Connection

The Cisco uBR924 cable access router provides an RJ-11 port (Line) that connects to a standard analog telephone wall jack. In the event of a building power failure or a Cisco uBR924 power problem, the cutover port lets you dial out using the backup PSTN line. If the Cisco uBR924 loses power while VoIP calls are in progress, you can reestablish one of the two connections—dialing out over the PSTN.

Configuring the Cisco uBR900 Series Cable Access Routers 15