STM SDH
STM-1 Add-Drop Multiplexer

Features and Highlights

• 1U height, 19-Inch standard rack-mountable chassis
• Provides complete diagnostics facilities to the user for monitoring optical ports and provide reading of optical transmit power, optical receive power, laser temperature, bias current in voltage alarms etc.
• Performance Monitoring and Alarms - Error counts for B1, B2, B3
• Performance Analysis - Error Seconds (ES), Several Error Seconds (SES), Unavailable seconds (UAS), Higher Order Virtual Container - Remote Error Indication (HOVC-REI), Higher Order Virtual Container - Pointer Justification Event (HOVC-PJE)
• Supports 1+1 Line Protection and Automatic Protection Switching (APS) with less than 50ms recovery
• Supports point-to-point, ring and chain topology (4 VCG card only)
• Local management and network-based management via a unified platform
• Supports Remote Power Down Detection and Auto Laser Shutdown
• Supports STM-1 and E1 loop-back for troubleshooting
• 850nm multi-Mode, 1310nm Single Mode and 1550nm Single Mode optical interface options offered
• Ethernet mapping adopts GFP/VC-12 virtual concatenated technology; according with MSTP criterion
• Provides Ethernet over SDH mapping through standard GFP and VC-12 virtual concatenation (VCAT)
• Ethernet bandwidth can be adjusted by the user between 2MBps ~126 Mbps (VC-12 mapping)
• Supports MAC Address list filtration, learning and updating function
• Easy to operate

Ethernet Standards Conformity

• Generic Framing Procedure GFP-F compliant with ITU-T G.7041
• VCAT compliant with ITU-T G.707 and LCAS compliant with ITU-T G.7042
• Ethernet flow control on WAN port and LAN port
• Large buffer size upto 410,000 bytes
• Maximum Frame length (MTU size):1536 bytes with 4 port 1 channel (1 VCG) Ethernet Card
• Maximum Frame length (MTU size):2036 bytes with 4 port 4 channel (4 VCG) Ethernet Card
• Auto MID/MID-X for Ethernet Interfaces
• Support 802.1Q based VLAN tagging (4 ports 1 channel (1 VCG) Ethernet Card only)
• Support Port based VLAN tagging (4 ports 1 channel (1 VCG) Ethernet Card only)
• Performance Analysis
• All Received Packets
• All Transmitted Packets
• Received Dropped Packets

Timing mode

• Synchronization with STM-1 line timing
• Synchronization with timing from any of the E1 interfaces (1-16 E1 tributary interfaces)
• External timing source option - 120 Ohms 2MBps (External Bits Clock)
• External timing source - 120 Ohms 2MHz (External TTL Clock) - Factory Configurable
• Internal Clock - ITU-T G.813 internal oscillator (Stratum 3)
• The timing source can be auto-switched according to default or operator programmed settings

Service interfaces

• 2 x STM-1 optical interfaces, MSA compliant SFP (pluggable) optical module (LC connector) based design, which supports onsite optical port replacement
• 2 x STM-1 electrical interfaces, SFP electrical module (Mini BNC connector) Optional
• Maximum 16 E1 interfaces compliant with ITU-T G.703 (8 E1 interfaces per card)
• 120 Ohms E1 and 75 Ohms E1 interfaces options available
• 4 x 10/100BaseT Ethernet (electric) interface
• 10/100BaseT (FE) Ethernet Interface Options:
• 4 Ports, 4 Channels (4 VCG), and
• 4 Port 1 Channel (1 VCG)
• 1x GigE (Gigabit) Ethernet interface Options
• Optical GigE (Gigabit) Ethernet interface,
• Electrical 1000BaseT (Gigabit) Ethernet Interface

Management and Maintenance interfaces

• 10/100BaseT Ethernet management interface
• RS232 serial management interface
• Remote (Telnet) management interface
• Windows XP based Graphical User Interface (GUI)
• Windows 7 based Graphical User Interface (GUI)
• SNMP V2 Monitoring
• NMS (Network Management System) for monitoring multiple units from a single / central location

Alarm and Indicator Monitoring

• Power Indicator
• Current Status (integrity and activity) Indicator
• Urgent Alarm Indicator
• Minor Alarm Indicator
• Optical Signal Loss Alarm Indicator
• Remote Device Power-down Indicator
• Ethernet Card Status Indicator
• General Alarm Indicator for Ethernet Card (including Link-down of Ethernet Port)
• Auto Laser Shutdown (ALS) Indicator
• Ethernet Link Indicator
• Ethernet Speed Indicator
• E1 Card Status Indicator
• Dry contact via 9-pin, D-type male connector
• Buzzer Alarm
• SNMP Diagnostic and Monitoring

Redundant power supply card options

• AC+DC, DC+DC and AC+AC
• 110V AC - 240V AC (50/60 Hz) power options available
• -48V DC power option available
• -24V DC power option available
• Power consumption less than 17W.