SYSTEM SPECIFICATIONS
GENERAL
Number of PCM Trunks : 2
Number of user ports : 40 max., modularity of 4 in most
cases.
Number of configurable user ports : 30
max., excluding Teleprinter
data
Types of VF interfaces supported : E&M 2W and 4W
Loop Incoming
Loop
Outgoing
Subscriber
Interface
Exchange
Interface
Hot
Line
Types of data interfaces supported : 64 Kbps G.703 codirectional
1200
to 19200 baud sync
1200
to 19200 baud async
Nx64 Kbps Sync.
U
Interface (64/128 Kbps)
N*64,G.703/Fractional E1
Basic Shelf dimensions for one : 265 x 483 x 260
VMX-0100
terminal (H
x W x D in mm)
Power Supply : -36V to -72V, -48(Nom.)
Network Clock Synchronisation : Selected
from
Extracted
PCM1 Clock
Extracted
PCM2 Clock
Data
Interface Clock
2.048
MHz External Clock
2.048
MHz Internal Clock
Other Synchronising features : 2.048 MHz network clock
out available
Omnibus
Conferencing : 18 3/4 party conferencing, of
which
maximum 8 conferences
can
be 4-party. .
Alarms : All alarms user programmable for threshold and type as Major /
Minor/None.
All
alarms logged in history file
Network Management : A PC based Application
available
for network control and
management.
Multiplexing : As per recommendations G.732
Framing Structure : As per recommendations G.706
Interface : As per recommendations G.703
Clock Rate : 2048 Kbps ± 50 ppm
Output impedance : 75Ω unbalanced/120Ω
balanced
Input impedance : 75Ω unbalanced/120Ω balanced
VF INTERFACES
SPECIFICATIONS
(i) E
& M (4W)
Coding : A-law,
rec. G.711
Nominal
impedance : 600Ω at input and output ports
Return
Loss : Better than 20dB in range
300-3400Hz
Quantization
distortion : Meets rec. G.712
Linearity : Meets rec. G.712
Frequency
distortion : Meets rec. G.712
Rx
Level : -11dBr to + 4dBr adjustable
in steps of 0.1 dB
Tx
level : -14dBr to 1dBr adjustable in
steps of 0.1dB
(ii) E
& M (2W)
Coding : A-law, rec. G.711
Nominal
impedance : 600Ω
Return
Loss : 12dB, 300-600Hz
15dB,
600-3400Hz
Quantization
distortion : Meets rec. G.712
Linearity : Meets rec. G.712
Frequency
distortion : Meets rec. G.712
Rx
Level : -15dBr to + 0 dBr adjustable in steps of 0.1dB
Tx
Level : -11dBr to +4 dBr adjustable in
Steps of 0.1dB
(iii) Loop Incoming
Open
Loop resistance : More than 10KΩ
Closed
Loop resistance : 1200 Ohm max.
Line
reversal detection : Provided
Line
potential disconnection : Provided
detection
Trunk
Offering : Provided
Dial
Plus speed : 8-12 pps
VF
specs : Same as for 2W, E & M
(iv) Loop
Outgoing
Max.
Loop resistance : 800Ω
Battery
reversal capability : Provided
Trunk Offering Detection : Provided
Blocking : Provided (Reverse potential
applied on limbs)
Dial
Pulse Speed : 8 - 12 pps
VF
specs : Same as for 2W, E & M
(v) FXS Interface
Max. Loop Resistance : 1200Ω
Battery reversal
capability : Provided
Ring Voltage : 75 V rms + 5V
Ring Frequency : 17-25 Hz
Dial Pulse Speed : 8-12pps
VF Specs : Same as for 2W, E & M
(vi) FXO Interface
Open Loop resistance : More
than 10KΩ
Closed Loop resistance : 1200 ohm max.
Minimum ring voltage : 15V rms
detection
Dial Pulse Speed : 8-12pps
VF Specs : Same as for 2W, E & M
(viii) Hot Line
Max. Loop resistance : 1200Ω
Ring Voltage : 75V rms.
Ring Frequency : 17-25Hz
VF Specs : Same as for 2W, E & M
Data Interface Specifications
( i ) 64 Kbps G.703 Data Interface
Interface : Codirectional as per rec. G.703
Nominal Output impedance : 120Ω
Nominal Input impedance : 120Ω
Return Loss at Input ports : 12dB for 4 KHz - 13
KHz
18dB
for 13 KHz - 256 KHz
14dB
for 256 KHz - 384 KHz
(ii) Low Speed Data Interface
Interface : V.24/V.35/V.11/X.21
Modes : Sync./Async
Rates
Supported : 1200, 2400, 4800, 9600 and 19200 Kbps
Signals
supported : Tx Data, RX Data,
RTS,
CTS, DSR/DCD
: TxC,
RxC, XTC (for Sync Modes
Only)
(iii) High Speed
Synchronous Data Interface “N X 64”
Conformity : To (CCITT) Rec. G.703
Mode : Synchronous
Bit Rate : 64 Kbps
Maximum Value of N :
30
(iv)
ISDN Digital
Subscriber Line (IDSL)
Interface : 2B1Q/ U interface as per ITU-T
G.961
Bit Rate : 64 / 128 Kbps
Features : Optional remote Power Feed
(v)
N*64, G.703/
Fractional E1 interface
Conformity (Electrical) :
ITU -T G.703
Frame Structure : As per ITU –T G.704, CRC4
Bit Rate : 2048 Kbps + 50 ppm
Value of N : 1 - 30
Clock InterfaceS
( i ) 2.048 MHz Clock Input
Termination : 75Ω unbalanced/120Ω balanced
Rate : 2048 KHz ± 50ppm
Signal Wave Shape : As per figure 21/G.703(Bluebook) modified by interconnecting line.
Maximum
Line Attenuation : 6dB
(iii) 2.048 MHz Clock Output
Nominal Impedance : 75Ω unbalanced/120Ω
balanced
Rate : Synchronised to system clock
Wave Shape : As per fig 21/G.703
Other specs : As per § 10/G.703
