Cisco Systems MC-607 manual Backup Pots Connection, MC-622

Configuring Subscriber-End Broadband Access Router Features

Voice over IP Operations

Table 39 Cisco uBR924 Cable Access Router Voice Specifications (continued)

Metric	Value
Amplitude tracking (input level, dBmO):	Max Dev.	Ave. Dev.
–37 to 0 (on-hook)	<= ±0.5 dB
–37 to +3 (off hook)	<= ±0.5 dB	<= ±0.25 dB
–50 to –37 (off-hook)	<= ±1.0dB	<= ±0.5 dB
–55 to –50 (off-hook)	<= ±3.0 dB	<= ±1.5 dB
Crosstalk	<= -65 dBmO
Amplitude jitter
20 to 300 Hz	<= 2.5% Peak
4 to 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 (>= ± 3 dB)	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.

Cisco IOS Multiservice Applications Configuration Guide

MC-622