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STM-1 Monitoring Groomer
Non-Intrusive STM-1 Monitoring Solution

Product Overview

Orion Telecom Networks Inc. offers the VCL-STM-1 Monitoring Groomer is a cost-effective monitoring and grooming equipment which may be used to "non-intrusively" monitor "bi-directional" STM-1 links through a 80:20 optical splitter patch panel and allow the user to select 64Kbps time-slots and groom them to E1 output ports, which may be then connected to E1 probes, E1 signaling analyzers and billing servers etc.

The equipment provides as many as 32 E1 output ports to which the selected / groomed 64Kbps time-slots may be output.

The figure shown below, illustrates a typical "non-intrusive", bi-directional monitoring application of an STM-1 link in both east and west directions and the groomed time-slots are output to E1 interfaces.

  Note: The Optical signal is "tapped" through an optical patch panel using a 80:20
           optical signal splitter.


  • Single box solution - capable of "monitoring" a bi-directional STM-1 optical link and "grooming" the selected 64 Kbps, DS-O time-slots to output E1 Ports
  • Compact size
  • Integrated optical amplifier
  • Modular
  • Easy to configure and manage
  • Remote access
  • Dual Power Supply Input
  • Dual Power Supplies (Dual -48V DC operation)

Ordering Part Number


Product Description

STM-1 Monitoring Groomer:  Non-Intrusive STM-1 Monitoring Solution

Additional solutions offered and available for Hi-z Non-Intrusive Monitoring applications are:

Technical Specifications

STM-1 Input Interfaces

Maximum number of STM-1o Inputs 2 (for bi-directional monitoring)
Type of STM-1 signal input 1310nm or 1550 nm (ITU-T G.957 compliant)
Minimum STM-1 Input signal -38.5dB
STM-1 Interface(s) SFP - LC connector

E1 Output Interfaces

E1 interface outputs 32
Conformity G.703
Framing G.704
Bit rate 2048kbps 50ppm
Code HDB3
Nominal Impedance 120 ohms balanced
Peak Voltage of a mark
For 120 ohms balanced interface
3.0 V 0.3 V
Peak Voltage of a space
For 120 ohms balanced interface
0 V 0.3 V
Nominal Pulse Width 244ns
Pulse Mask As per CCITT rec. G.703

Power Supply

Power Input -48V DC nominal, -36V to 60V DC range
Power consumption Less than 60 Watts
Maximum current consumption 1.25 Amps @ - 48 V DC

Timing & Synchronization

  • Loop Timed (clock derived from STM-1 input signal) on Port A or Port B
  • Internal Clock
  • External Clock (120 Ohms Impedance)
  • Timing & Synchronization of System (as per ITU-T G. 813)
  • Internal and External Timing interfaces
  • Two E1 BITS interfaces (as per ITU-T G.703)
  • Internal oscillator capable of supplying a ITU-T G.813 compliant Stratum-3 SEC Support of SSM byte


  • RS232 Serial (COM) Interface
  • 10/100 Base-T/RJ-45 management interface
  • Alarm Indicators and External Alarm Outputs


Operating Temperature 0 to 50C
Relative Humidity 10% to 90%, non-condensing

Mechanical Specifications

Height 133 mm
Width 477 mm
Depth 260 mm
Weight 8.5 Kg

Others Links

Technical specifications are subject to change without notice.
All brand names and trademarks are the property of their respective owners.


STM-1 Monitoring Groomer Solution - Data Sheet PDF (128 KB)

Groomers (Hi-Z Non Instrusive Monitoring)
64 Port E1 Monitoring Groomer (Hi-Z Non Intrusive Monitoring)
16 Port Plus E1 Monitoring Groomer (Hi-Z Non Intrusive Monitoring)
16 Port Plus T1 Monitoring Groomer (Hi-Z Non Intrusive Monitoring)
32 Port Plus E1 Monitoring Groomer (Hi-Z Non Intrusive Monitoring)
32 Port Plus T1 Monitoring Groomer (Hi-Z Non Intrusive Monitoring)
64 Port Plus - T1 Monitoring Groomer
64 Port Plus - E1 Monitoring Groomer

GSM Gateway / GSM Channel Banks

Echo Cancellers and Voice Quality Enhancement

Digital Access Cross Connect Switch (DACS)

Groomers (Hi-Z Non-Instrusive Monitoring)

STM SDH Multiplexer
Optical Transmission
E1, T1, E3, DS3, Ethernet Converters
APS (1+1) Automatic
Protection Switch
::   Application Diagram  ::

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