MH88634BT-2 [MITEL]
Central Office Interface Circuit Advance Information; 中央办公厅接口电路超前信息
| 型号： | MH88634BT-2 |
| 厂家： | 
MITEL NETWORKS CORPORATION |
| 描述： | Central Office Interface Circuit Advance Information |
| 文件： | 总13页 (文件大小：61K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MH88634B
Central Office Interface Circuit
Advance Information
DS5061
ISSUE 6
January 1999
Features
Ordering Information
•
•
•
•
•
•
•
•
•
•
•
•
Loop Start Trunk Interface
MH88634BV-2
MH88634BT-2
MH88634BV-4
21 Pin SIL Package
21 Pin 90° L/F Package
21 Pin SIL Package
600Ω & 900Ω Input Impedance
2-4 Wire Conversion
Line state Detection Outputs:
- Forward Loop
0°C to 70°C
- Reverse Loop
Description
- Ringing Voltage
- Switch Hook
The Mitel MH88634-2 Central Office Interface Circuit
trunk provides a complete analogue and signalling
link between audio switching equipment and a
telephone Line. The device is available in a single in
line package for high packing densities or with a lead
frame formed at 90° for low clearance applications.
One Relay Driver
On-Hook Reception
Small footprint area
Meets FCC Part 68 Leakage Current
Requirements
The device is fabricated as a thick film hybrid
incorporating various technologies for optimum
circuit design and very high reliability.
Applications
Interface to Central Office for:
•
•
•
•
•
•
•
PABX
This part supercedes the MH88634-2 and is pin for pin
compatible.
Key Telephone Systems
Channel Bank
We advise that the B rev parts are fully tested.
However, we do not expect to see changes between
MH88634-2 and MH88634BV-2.
Voice Mail
Terminal Equipment
Digital Loop Carrier
Optical Multiplexer
The component design has been changed to
improve the general performance of the part. It is
also now capable of operating at a 24V battery.
VCC
VEE
AGND
XLD
RL SHK XLA XLB XLC
RV
FL
Status
Detection
Receive
Gain
RX
TX
TIP
2 - 4 Wire
Hybrid
Line
Termination
Dummy
Ringer
Transmit
Gain
RING
LRC
LRD
Loop Relay
Driver
Impedance
Matching
Network
Balance
VRLY
Figure 1 - Functional Block Diagram
2-265
MH88634B
Advance Information
21
20
19
18
17
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
TIP
RING
XLA
XLD
XLB
XLC
IC
IC
IC
SHK
RX
VEE
TX
RV
FL
RL
VCC
AGND
LRC
VRLY
9
10
11
12
13
14
15
16
17
18
8
7
6
5
4
3
2
1
19
20
21
LRD
Figure 2 - Pin Connections
Description
Pin Description
Pin #
Name
1
2
3
TIP
Tip Lead. Connects to the "Tip" lead of a Telephone Line.
RING Ring Lead. Connects to the "Ring" lead of a Telephone Line.
XLA
XLD
XLB
XLC
Loop Relay Contact A. Connects to XLB through the Loop relay (K1) contacts when the
relay is activated.
4
5
6
Loop Relay Contact D. Connects to XLC through the loop relay (K1) contacts, when the
relay is activated.
Loop Relay Contact B. Connects to XLA through the loop relay (K1) contacts, when the
relay is activated.
Loop Relay Contact C. Connects to XLD through the loop relay (K1) contacts, when the
relay is activated.
7-9
10
IC
Internal Connection. No connection should be made to this pin.
SHK
Switch Hook (Output). A logic 0 indicates the presence of forward or reverse battery
voltage when LRC is logic 0 and the presence of forward or reverse loop current when LRC
is logic 1.
11
12
13
14
RX
VEE
TX
Receive (Input). 4-Wire ground (AGND) referenced analog input.
Negative Supply Voltage. -5V DC
Transmit (Output). 4-Wire ground (AGND) referenced analog output.
RV
Ringing Voltage Detect (Output). A logic low indicates that ringing voltage is across the Tip
and Ring leads.
15
16
17
FL
RL
Forward Loop Detect (Output). In the on-hook state, a logic 0 output indicates that
forward loop battery is present. In the off-hook state, a logic 0 indicates that forward loop
current is present.
Reverse Loop Detect (Output). In the on-hook state, a logic 0 output indicates that
reverse loop battery is present. In the off-hook state, a logic 0 output indicates that reverse
loop current is present.
VCC
Positive Supply Voltage. +5V DC
2-266
Advance Information
MH88634B
Pin Description (continued)
18
19
20
21
AGND Analog Ground. 4-wire ground (AGND). Normally connected to system ground.
LRC Loop Relay Control (Input). A logic 1 activates the Loop Relay Driver output (LRD).
VRLY Relay Positive Supply Voltage. Typically +5V. Connects to the relay supply voltage.
LRD
Loop Relay Drive (Output). Connects to the Loop Relay Coil. When LRC is at a logic 1 an
open collector output at LRD sinks current and energizes the relay.
Functional Description
Line Termination
The MH88634 is a Central Office Interface Circuit
(COIC). It is used to correctly terminate a Central
Office 2-wire telephone line. The device provides a
signalling link and a 2-4 Wire line interface between
the Telephone Line and subscriber equipment. The
subscriber equipment can include Private Branch
Exchanges (PBXs), Key Telephone Systems,
Terminal Equipment, Digital Loop Carriers and
Wireless Local Loops.
When LRC is at a logic 1, LRD will sink current
which energizes the Loop Relay (K1), connecting
XLA to XLB and XLC to XLD. This places a line
termination across Tip and Ring. The device can be
considered to be in an off-hook state and DC loop
current will flow. The line termination consists of a
DC resistance and an AC impedance. When LRC is
at a logic 0, the line termination is removed from
across Tip and Ring.
All descriptions assume that the device is connected
as in the application circuit shown in Figure 3.
An internal Dummy Ringer is permanently connected
across Tip and Ring which is a series AC load of
(17kΩ+330nF). This represents
a
mechanical
telephone ringer and allows ringing voltages to be
sensed. This load can be considered negligible
when the line has been terminated.
Isolation Barrier
The MH88634 provides an isolation barrier which is
designed to meet FCC Part 68 (November 1987)
Leakage Current Requirements.
Depending on the Network Protocol being used the
Line Termination can terminate an incoming call,
seize the line for an outgoing call, or if applied and
disconnected at the correct rate can be used to
generate dial pulse signals.
External Protection Circuit
An external Protection Circuit Device assists in
preventing damage to the device and the
subscriber’s equipment, due to over-voltage
conditions. The type of protection required is
dependant upon the application and regulatorary
standards. Further details should be obtained from
the specific country’s regulatorary body. Typically
you will need lightening protection supplied by
resettable fuses or PTCTM and mains crossover
protection via a foldover diode.
The DC line termination circuitry provides the line
with an active DC load termination which is
equivalent to a DC resistance of 280Ω at 20mA
Ringing Equivalent Number
The Ringing Equivalent Number (REN) is application
specific.
See the governing regulatory body
specification for details.
Suitable Markets
Input Impedance
The MH88634BV-2/BT-2 has fixed 600Ω line and
network balance impedance for use in North
America and Asia.
The input impedance (Zin) is the AC impedance that
the MH88634 places across Tip and Ring to
terminate the Telephone line. This is fixed at 600Ω
on the -2 variant and 900R on the -4.
The MH88634BV-4 has a fixed 900R impedance and
is also suitable for some applications in North and
South America
2-267
MH88634B
Advance Information
Ringing Voltage Detect Output (RV)
Network Balance Impedance
The RV output provides a logic 0 when ringing
voltage is detected across Tip and Ring. This
detector includes a filter which ensures that the
output toggles at the ringing cadence and not at the
ringing frequency. Typically this output switches to a
logic 0 after 50ms of applied ringing voltage and
remains at a logic 0 for 50ms after ringing voltage is
removed.
The
MH88634BV-2/BT-2’s
Network
Balance
Impedance is fixed at 600Ω.
The MH88634BV-4 Network Balance Impedance is
fixed at 900R.
2-4 Wire Conversion
The threshold is different on the two variants. The
900R part has been designed to meet the ring
sensitivity requirements of TR57, 30 not detecting
ringin below 35Vrms.
The device converts the balanced 2-Wire input,
presented by the line at Tip and Ring, to a ground
referenced signal at TX. This circuit operates with or
without loop current; signal reception with no loop
current is required for on-hook reception enabling the
detection of Caller Line Identification (CLI) signals.
Forward Loop and Reverse Loop Detect Outputs
(FL & RL)
The FL output provides a logic 0 when either forward
loop battery or forward loop current is detected, that
is the Ring pin voltage is more negative than the Tip
pin voltage.
Conversely the device converts the ground
referenced signal input at RX, to a balanced 2-Wire
signal across Tip and Ring.
The RL output provides a logic 0 when either reverse
loop battery or reverse loop current is detected, that
is the Tip pin voltage is more negative than the Ring
pin voltage.
The 4-Wire side (TX and RX) can be interfaced to a
filter/codec, such as the Mitel MT896X, for use in
digital voice switched systems
During full duplex transmission, the signal at Tip and
Ring consists of both the signal from the device to
the line and the signal from the line to the device.
The signal input at RX, being sent to the line, must
not appear at the output TX. In order to prevent this,
the device has an internal cancellation circuit. The
measure of attenuation is Transhybrid Loss (THL).
Switch Hook (SHK)
The SHK output is active if either forward loop or
reverse loop current is detected, or if forward or
reverse battery voltage is detected.
Control Input
Transmit and Receive Gain
The MH88634 accepts a control signal from the
system controller at the Loop Relay Control input
(LRC). This energises the relay drive output Loop
Relay Drive (LRD). The output is active low and has
an internal clamp diode to VRLY.
The Transmit Gain of the device is the gain from the
balanced signal across Tip and Ring to the ground
referenced signal at TX. It is set at 0dB.
The Receive Gain of the device is the gain from the
ground referenced signal at RX to the balanced
signal across Tip and Ring. It is set at -2dB.
The intended use of this relay driver is to add and
remove the Line Termination from across Tip and
Ring, as shown in Figure 3.
Supervision Features
If this Control input and the Supervisory Features are
used as indicated in Figure 3, Loop-Start Signalling
can be implemented.
Line Status Detection Outputs
The MH88634 supervisory circuitry provides the
signalling status outputs which are monitored by the
system controller. The supervisory circuitry is
capable of detecting: Ringing Voltage; Forward and
Reverse loop battery; Forward and Reverse loop
current; and Switch Hook.
Mechanical Data
See Figure
specification.
9
for details of the mechanical
2-268
Advance Information
MH88634B
MH88634
+5V
1
2
Tip
C1
TIP
17
VCC
Protection
Circuit
Ring
RING
+5V
13
11
Analog Out
Analog In
TX
RX
21
K1
LRD
VRLY
LRC
20
19
Loop Relay Control
14
15
RV
Ringing Detect
Forward Loop
Reverse Loop
Switch Hook
K1
K1
5
3
XLB
XLA
FL
RL
16
10
6
4
XLC
XLD
SHK
AGND
18
VEE
12
C2
NOTES:
1) K1 Electro Mechanical 2 Form A
2) C1 and C2 are decoupling capacitors
-5V
Figure 3 - Typical LS Application Circuit
2-269
MH88634B
Advance Information
Absolute Maximum Ratings*
Parameters
Sym
Min
Max
Units
Comments
1
DC Supply Voltages
VCC
VEE
-0.3
0.3
7
-7
V
V
2
3
4
DC Ring Relay Voltage
Storage Temperature
Ring Trip Current
V
-0.3
-55
18
V
RLY
T
+125
180
˚C
S
I
mArms 250ms 10% duty cycle or 500ms single shot
TRIP
*Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
Recommended Operating Conditions
‡
Parameters
Sym
Min
Typ
Max
Units
1
DC Supply Voltages
V
V
4.75
-4.75
5.0
-5.0
5.25
-5.25
V
V
CC
EE
2
3
DC Ring Relay Voltage
V
5.0
25
15
70
V
RLY
Operating Temperature
T
0
˚C
OP
‡ Typical figures are at 25°C with nominal 5V supplies and are of r design aid only.
s
DC Electrical Characteristics†
‡
Characteristics
Supply Current
Sym
Min
Typ
Max
Units
Test Conditions
1
ICC
IEE
5
13
13
mA
mA
2.5
2
3
Power Consumption
PC
37.5
137
0.5
mW
V
not connected
BAT
FL
RL
Low Level Output Voltage
High Level Output Voltage
VOL
VOH
V
V
I
I
= 4mA
OL
2.4
= 0.4mA
OH
SHK
RV
4
LRD
Sink Current, Relay to
IOL
ICD
100
150
mA
mA
V
= 0.35V not
OL
V
continuous, LRC=5V
CC
Clamp Diode Current
5
6
LRC
LRC
Low Level Input Voltage
High Level Input Voltage
VIL
VIH
0.8
V
V
2.0
High Level Input Current
Low Level Input Current
IIH
IIL
40
40
µA
µA
V
= 5.0V
IH
† Electrical Characteristics are over recommended operating conditions unless otherwise stated.
‡ Typical figures are at 25°C with nominal 5V supplies and are of r design aid only.
2-270
Advance Information
MH88634B
DC Electrical Characteristics†
‡
Characteristics
Symbol
Min
Typ
Max
Units
Test Conditions
1
2
Ringing Voltage
VR
40
90
150
Vrms
-2 Variant only
17 to 68Hz
Detect
No Detect
VR
60
16
106
35
Vrms
-4 Variant only
-4 Variant only
16-33Hz
(TR57 compliant)
3
4
5
Operating Loop Current
Off-Hook DC Resistance
70
280
7
mA
270
Ω
@ 20mA
Note 1
Leakage Current
mArms @ 1000VAC
(Tip-Ring to AGND)
6
7
SHK & FL Threshold
Tip-Ring (On-hook)
Tip-Ring Current (Off-Hook)
12
5
21
15
Vdc
mA
LRC = 0V
LRC = 5V
SHK & RL Threshold
Tip-Ring (On-Hook)
Tip-Ring Current (Off-Hook)
12
-5
21
-15
Vdc
mA
LRC = 0V
LRC = 5V
† Electrical Characteristics are over recommended operating conditions unless otherwise stated.
‡ Typical figures are at 25°C with nominal 5V supplies and are of r design aid only.
Note 1: Maximum figure of 282Ω at 0°C
2-271
MH88634B
Advance Information
AC Electrical Characteristics†
‡
Characteristics
Symbol
Min
Typ
Max
Units
Test Conditions
1
2
3
2-wire Input Impedance
Zin
600
900
Ω
-2 Variant
-4 Variant
Return Loss at 2-wire
RL
Test Circuit as Fig 6
200-3400 Hz
20
29
dB
Longitudinal to Metallic
Balance
Test Circuit as Fig 7
200Hz
1000Hz
58
55
53
60
60
58
dB
dB
dB
3400Hz
4
5
Transhybrid Loss
Gain, 2 wire to TX
THL
20
27
dB
200-3400Hz
Test Circuit as Fig 4
1000Hz
200-3400Hz
-0.25
-0.3
0
0
0.25
0.3
dB
dB
Relative Gain
Gain, Rx to 2 wire
6
Test Circuit as Fig 5
1000Hz
200-3400Hz
-2.25
-0.3
-2
0
-1.75
0.3
dB
dB
Relative Gain
7
8
9
Input impedance at RX
Output impedance at TX
Signal Overload Level
10
5
kΩ
Ω
% THD < 5% @ 20mA
at 2-wire
at TX
10 Total Harmonic Distortion
at 2-wire
4.0
1.7
dBm
dBm
THD
1.0
1.0
%
%
Input 0.5V, 1kHz @
RX
Input 0.5V, 1kHz @
Tip-Ring
at TX
11 Idle Channel Noise
NC
at 2-Wire
at TX
15
15
16.5
16.5
dBrnC
dBrnC
12 Power Supply Rejection Ratio
PSRR
Ripple 0.1V, 1kHz
at 2-wire and TX
VCC
VEE
25
25
48
47
dB
dB
13 On-Hook Gain, 2-Wire to TX
Relative to Off-Hook Gain
-1
0
1
dB
Input 1000Hz @ 0.5V
Test Circuit as Fig. 8
14 Met. to Long. Balance
-2 Variant
60
40
55
40
62
48
62
48
200-1000Hz
1000-3400Hz
200-1000Hz
1000-3400Hz
-4 Variant
15 Common Mode Rejection
Ratio
CMRR
48
55
dB
Test Circuit as Fig. 7
1000Hz, FL = 0V,
ILoop = 25mA
† Electrical Characteristics are over recommended operating conditions unless otherwise stated.
‡ Typical figures are at 25°C with nominal 5V supplies and are of r design aid only.
2-272
Advance Information
MH88634B
-V
+5V
-5V
10H 300Ω
VEE
VCC
XLA
XLB
100uF
+
RING
I = 25mA
XLC
XLD
Vs = 0.5V
600Ω
~
100uF
+
V
TX
RX
tx
TIP
V
AGND
10H 300Ω
Gain = 20 * Log (Vtx/Vs)
Figure 4 - 2-4 Wire Gain Test Circuit
-V
+5V
-5V
10H 300Ω
100uF
+
VEE
VCC
XLA
XLB
RING
I = 25mA
XLC
XLD
VZ
Z = 600Ω
100uF
+
TX
RX
TIP
Vs = 0.5V
AGND
10H 300Ω
~
Gain = 20 * Log (Vz/Vs)
Figure 5 - 4-2 Wire Gain Test Circuit
2-273
MH88634B
Advance Information
-V
+5V
-5V
10H 300Ω
VCC
VEE
XLA
XLB
100uF
+
600Ω
RING
I = 25mA
XLC
XLD
368Ω
368Ω
Vs = 0.5V
V1
~
100uF
+
TX
RX
TIP
AGND
10H 300Ω
Return Loss = 20 * Log (V1\Vs)
Figure 6 - Return Loss Test Circuit
-V
+5V
-5V
10H 300Ω
100uF
VEE
VCC
XLA
XLB
RING
+
I = 25mA
XLC
XLD
368Ω
V1
368Ω
Vs = 0.5V
V
100uF
+
tx
TX
RX
~
VEX
TIP
V
AGND
10H 300Ω
Long to Met Bal. = 20 * Log (V1\Vs)
CMRR = 20 * Log (Vtx\Vs) - ( 2-4W Gain)
Figure 7 - Longitudinal to Metallic Balance and CMRR Test Circuit
2-274
Advance Information
MH88634B
-V
+5V
-5V
10H 300Ω
100uF
VEE
VCC
XLA
XLB
RING
+
I = 25mA
368Ω
XLC
XLD
Vs = 0.5V
~
510Ω
V1
100uF
TX
RX
368Ω
TIP
+
AGND
10H 300Ω
Met to Long Bal. = 20 * Log (V1\Vs)
Figure 8 - Metallic to Longitudinal Balance Test Circuit
0.13 Max
(3.3 Max)
0.14 Max
(3.6 Max)
2.120 Max
(53.85 Max)
0.625 Max
(15.9 Max)
1
0.180 + 0.020
(4.57 + 0.51)
0.020 +0.005
(0.5 +0.13)
*
*
0.010 + 0.002
(0.25 + 0.05)
0.250+0.020
(6.35+0.51)
0.100 + 0.010
(2.54 + 0.25)
Notes:
1) Not to scale
2) Dimensions in inches. (Dimensions in millimetres)
3) Pin tolerances are non-accumulative.
4) Recommended soldering conditions: Wave soldering tempetature 260˚C for 10 secs.
* Dimensions to centre of pin.
Figure 9 - Mechanical Data
2-275
MH88634B
Advance Information
2.12 Max
(53.85 Max)
0.62 Max
(15.75 Max)
1
0.080 +0.020
(2.03 +0.51)
0.170 Max
(4.32 Max)
0.080 Max
(2.03 Max)
Notes:
1) Not to scale
0.260 +0.015
(6.60 +0.38)
2) Dimensions in inches.
(Dimensions in millimetres)
3) Pin tolerances are non-accumulative.
4) Recommended soldering conditions:
Wave Soldering -
*
0.100 0.010
(2.54 0.25)
0.020 +0.005
(0.51 +0.13)
Max temp at pins 260˚ for 10 secs.
0.250 0.020
(6.35 0.51)
* Dimensions to centre of pin.
Figure 10 - MH88634T-2 Mechanical Information
2-276
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