Preliminary Information
AC Electrical Characteristics*
Characteristics
1
2
3
4
MH88620BR
Sym
Min
Typ
‡
0
0
25
Max
Units
dB
dB
V
RMS
Test Comments
Externally adjustable
Externally adjustable
R
Loop
= 1400Ω
Term. 6.8µF +200Ω
V
Bat
= -48V
T-R load = 10Ωk min.
Dial Pulse Detection
Adjustable
300-500Hz
500-2500Hz
2500-3400Hz
300Hz
600-2000Hz
3400Hz
Analog Tx Gain (T-R to TX)
Analog Rx Gain (RX to T-R)
Ringing Capability
On-hook Transmission
Signal input level
Gain
SHK Rise Time
Fall time
2 Wire Termination Impedance
Off-Hook Detect Threshold
2-Wire Return Loss
900
Ω
at T-R
Zin = 900Ω
900Ω + 2.16µF at T-R
Zin = 900Ω
20
26
20
14
18
14
t
R
t
F
4
1
1
900
10
2.0
8
V
RMS
dB
msec
msec
Ω
mA
dB
dB
dB
dB
dB
dB
5
6
7
8
9
Longitudinal Balance
Longitudinal to Metallic
58
55
53
40
N
CR
N
CX
THL
16
20
16
8
12
dB
dB
dB
mA
dBrnc
dBrnc
2000Hz, 1000Hz
2000Hz, 3000Hz
3400Hz
20mA per lead
10
11
Longitudinal Current Capability
Idle Channel Noise
Rx to T-R
T-R to Tx
Transhybrid Loss
Tx gain 0dB
Rx gain 0dB
12
dB
dB
dB
300-500Hz
500-2500Hz
2500-3400Hz
T-R = 900Ω
V
Bat
= -48V
13
14
15
16
17
18
19
20
Analog Signal Overload Level at
TIP and RING
Ringing Signal Voltage
Ringing Frequency
Ring Trip Delay
Absolute Gain variation
Relative Gain, reference to 1kHz
Power Supply Rejection Ratio
V
Bat
V
DD
V
EE
PSRR
24
24
24
30
30
30
-25
-2
70
20
80
25
100
0
0
4
90
30
+.25
+.2
dBm
V
RMS
Hz
ms
dB
dB
dB
0dBm at T-R, 1kHz
300-3400Hz
1kHz, 100mVpp
* AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡ Typical figures are at 25°C with nominal + 5V supplies and are for design aid only.
Note: Test Conditions use a transmit and receive gain set to 0dB default and a Z
in
value of 900Ω unless otherwise stated.
“Ref” indicates reference impedance which is equivalent to the termination impedance.
“Net” indicates network balance impedance.
2-149
MITEL [ MITEL NETWORKS CORPORATION ]
