OAMC

The OAMC card provides static user interfaces for managing operations, administration, maintenance and controller of the system. OAMC performs Optical Supervisory Channel (OSC) processing up to 100Mbps, control path processing and timing functions.

The OSC ports (P2 and P3) are used for out of band optical management communication for the DWDM configuration of the node. P4 is used as LCT port and P5 is used as NMS port.

NOTE: Port P1 is not supported for this release.

STATIC DISCHARGE DAMAGE: Static charge can damage the equipment. While handling cards for making system interconnections, wear an ESD strap to discharge the static buildup.

OPTICAL SAFETY: Do not stare or look directly into the optical connector output beam, as this can cause irreparable damage to your eyes and even loss of eye sight.

Front panel

Following figure shows the front panel diagram of OAMC card supported in TJ1600 Type-2SR chassis without the mechanical adaptor:

Power specifications

Power specifications - OAMC card

Visual indicator details

The visual indicators on the OAMC card include two LEDs, the Active (Act) and the Status (Sts).

Possible LED status and their significance - OAMC

There are three alarm visual indications on the faceplate of OAMC card:

• Critical Alarm
• Major Alarm
• Minor Alarm

Alarm LED status of HCPOAM01 card

BITS Interface

BITS interface is provided through RJ45 connector for the Data port and clock port. The BITS clock input is at 2.048 MHz and can be nominated as a reference for node synchronization. Loss-of-Signal (LOS) is detected on the clock input and this triggers to change over to the next synchronization reference. The timing reference failed alarm is reported on the user interface. The BITS data input is at 2.048 Mbps. Both PCM30 and PCM31 (with/without CRC) framing can be used on the input. This input can be nominated as a reference for node synchronization. LOS, LOF and AIS are detected on this input and this triggers to change over to the next synchronization reference. The timing reference failed alarm is reported on the user interface. The OAMC card contains redundant timing interfaces. The node can be synchronized from the following sources from OAMC card:

• Received STM-1/4/16/64 interfaces.
• Clock derived from External BITS clock.
• Clock derived from External BITS data.

DIAG interface

The DIAG interface is a USB connector provided on the front panel of the OAMC card. This interface offers a serial connection to node using which a user can launch a terminal session to log onto the Operating System.

NOTE: The diagnostic interface is meant for use by authorized Tejas Networks personnel only.

LCT Interface

The Local Craft Terminal (LCT) is an additional LAN interface( Port P4). The LCT is provided through a RJ-45 connector. The additional LAN interface runs a DHCP server and the port has a fixed IP address192.168.1.254, which cannot be changed. The LAN port is therefore always available for debugging through the GUI or a telnet session if there is any problem with the local LAN. The active cross connect and control card directly drives the NMS interface LEDs. The cross connect and control card does not do any processing on this interface.

OSC interface

Optical Supervisory Channel (OSC) interface receives the management information from the Optical supervisory channel filter, on the DWDM transmission path, primarily at the Intermediate Line Amplifier (ILA) sites. OSC carries the management information related to the DWDM channels and enable to detect the fiber cuts and/or transmission degradation in the DWDM trunk. Typical wavelengths used for supervisory channel are 1490nm and 1510 nm which are well outside the C-band DWDM transmission. Two SFP interfaces (OSC1 and OSC2) are provided for processing the OSC information from east and west directions which can cater up to 44dB of loss in the standard optical fiber.

External alarms interface

The OAMC card provides seven external alarm inputs and four external alarm outputs.

• ALARM-IN: The alarm inputs connect external triggers for events (such as open door or a shelf high temperature) to the OAMC card. When an event occurs, which activates the trigger connected to the external alarm input, the network element raises an environmental alarm. The external inputs are either enabled or disabled from the network element user interface. The severity, alarm text and the SNMP trap ID can be edited from the network element user interface. The Alarm-In interface is through a RJ-45 connector.
• ALARM-OUT: The alarm outputs can be used to trigger the operation of external equipment, such as a generator, fan or audible alarm. The alarm outputs are caused by alarms detected by the network element. The alarm-outs are classified as minor, major and critical. The Alarm-Out interface is through a RJ-45 connector.

NOTE: The PSS and 10M interfaces indicated on faceplate of OAMC card is supported in future releases.

Functional description

OAMC card has a processor complex to perform APS/IBC route communication/Node management and other miscellaneous functions required for the system.

OAMC card supports the following functional features:

1. Four Passive Inventory Management (PIM) ports.
2. Switch to holdover in absence of selected primary and/or secondary reference clocks.
3. Card present information of all other cards in the system to detect jack-in/jack-out of the cards in the system.
4. Generate and distribute system timing (clocks and frame syncs), system frame and system multi-frame signals to all line card slots.
5. Two OSC channels of 155Mbps and two user channels of 10Mbps are present.
6. Stratum-3 Timing source.
7. Temperature monitoring.
8. Supports 4GB disks.

The key functions of OAMC card is described below:

• Processor Function: OAMC card has a processor that performs the configuration, control and processing of all the other subsystems. The processor is a micro controller which has on board external memory to implement the required functions. The software residing in this block controls the overall management of the system. Processor card is a daughter card that interfaces with different memory interfaces like SDRAM, Flash Memory, PCMCIA and other memory. This function is also responsible for implementing watchdog logic for the system.
• OSC Processing: Optical supervisory channel (OSC) interface receives the management information from the Optical supervisory channel filter, on the DWDM transmission path, primarily at the intermediate line amplifier (ILA) sites. OSC carries the management information related to the DWDM channels and enable to detect the fiber cuts and/or transmission degradation in the DWDM trunk.
• Synchronization Function: OAMC card has a Stratum-3 compliant clock generation unit. The PLL in synchronization unit can synchronize to a variety of timing sources, selected via the user interface. Synchronization Status Messaging (SSM) is implemented in the software to propagate the clock quality information to neighbouring elements and to select the best quality clock among a set of nominated clock sources. The synchronization unit is commonly called the timing module.

NOTE: Synchronization Function support is not required in this release.