NEC nd-20292 manual Dialing Specifications, Battery Backup

ND-20292

CHAPTER 2 APRIL, 1990

TDM clock

TDM slot period

TDM data bus

TDM time frame

4.Telephones

a. Multiline Terminal

Voltage:

Max. current:

2.048 MHz

488.28 ns.

8 bit

125 ps.

and EDE-30-( 1 unit:

-11 - -26 VDC 200 mA

Maximum level per frequency pair: + 2dBm.

d. Rise time:	Within 5 ms.
e. DTMF tone	duration:
Default:	110	ms.
Minimum:	60 ms.
Maximum:	760 ms.
f. Interdigital	time:
Default:	70 ms.

Acoustic characteristics meet Electronic Industry

Association (EIA) standard proposal SP-1286 and standard EIA RS-470.

Minimum:	40	ms.
Maximum:	180	ms.

b. Single Line Telephone Standard 2500 set: Nominal current:

Ring signal:

500network 35mA

65 VAC RMS, 20 Hz

3.Dialing Memories

a. Station speed dialing:

20 buffers (16 digits each) per station

110 buffers (16 digits each) per ETE-16K-1

DkrnII:

Nominal current: Ring signal: Lamp signal:

2omA 50VAC RMS, 16Hz

53-88VDC

b. System speed dialing:

c. Last number redial:

80 buffers (16 digits each) per system.

1 per station (16 digits

220.16 DIALING SPECIFICATIONS

1.Dial Pulse Address Signaling: (Refer to Table 200-

10)	10 pps/20 pps
a. Pulse rate:
b. Percent break:	61 & 3 percent

d. Saved number dialed:

max.).

(Save & Repeat) 80 per system (16 digits max.).

c. Interdigital interval: nominal 700 ms.

2.DTMF Address Signaling a. Frequencies:

Table	200-10
		Nominal	High	Group
		Frequencies (Hz)
		1209	1336	1477
	69’	1	2	3
Nominal	,,.	4	5	6
Low Group
Frequencies(Hz1	852	7	8	g
	941	*	0	#

b. Frequency	deviation:	Less than f 1.5%
c. Signal level:		-6 - -4dBm.
Nominal	level per frequency:

Two sinusoidal signals, one from a high group of three

frequencies	and one from a low	group	of four
frequencies.
Minimum	level per frequency:		-1OdBm.
Low	group:
High	group:		-8 dBm.

220.17 BATTERY BACKUP

1.Backup Battery power is equipped on the CPU-EC 1, the SMDR-E ETU and the LCR-E ETU. These

NiCad batteries, when fully charged, retain

memory contents for approximately seven days, when power is removed from these ETUs.

2.Functions receiving backup with battery power are as follows:

a.System Program

b.Speed Dial Memories (System and Station1

C.Night Transfer Status

d.Call Forwarding

e.Clock/Calendar

f.Callback Request g* Message Waiting

h.Do Not Disturb

i.Save & Repeat

j. SMDR Data

k.LCR Data

1.Forced/ Verified Account Codes

m. Maintenance 8z Diagnostics Information

200 - 10