Power Unit
3.1.7 Parameter Settings
You can set the parameters for the OI16D by using the T2000.
Set the parameters for the OI16D on the T2000 before using it. The parameters that need to be set for the OI16D are as follows:
l J0
l J1
l C2
For the description of each parameter, see 13.1 SDH Boards.
3.1.8 Technical Specifications
The OI16D is integrated with the SCB. This topic provides the parameters specified for the optical interfaces of the OI16D. For the other technical specifications of the OI16D, see the topic that describes the technical specifications of the SCB.
Table 3-2 lists the parameters specified for the optical interfaces of the OI16D.
Table 3-2 Parameters specified for the optical interfaces of the OI16D
Parameter Value
Nominal bit rate 2488.32 Mbit/s Line code pattern NRZ
Parameter Value
The receive optical power in an actual environment should be the receiver sensitivity plus 3 dB.
3.2 OI4/OI4D
This topic describes the version, functions, working principle, front panel, valid slots, and technical specifications of the OI4/OI4D.
3.2.1 Version Description
The OI4 is available in four functional versions, namely, SS42, SS44, SS48, and SS49. The OI4D is available in two functional versions, namely, SS48 and SS49.
3.2.2 Functions and Features
The OI4/OI4D transmits and receives STM-4 optical signals, performs O/E conversion for the STM-4 optical signals, extracts and inserts overhead bytes, and generates alarm signals on the line.
3.2.3 Working Principle and Signal Flow
The OI4/OI4D consists of the O/E converting module, data and clock restoration module, SDH overhead processing module, logic control module, and power unit.
3.2.4 Front Panel
The front panel of the OI4/OI4D has an indicator, an interface, a bar code, and a laser safety class label.
3.2.5 Valid Slots
The OI4 can be installed in slot IU1, IU2, or IU3. The OI4D can be installed in slot IU1, IU2, IU3, or integrated with the SCB.
3.2.6 Feature Code
The number code that follows the board name in the bar code is the feature code of the board.
The feature code indicates the type of optical interface.
3.2.7 Parameter Settings
You can set the parameters for the OI4/OI4D by using the T2000.
3.2.8 Technical Specifications
The technical specifications of the OI4/OI4D include the parameters specified for optical interfaces, dimensions, weight, and power consumption.
3.2.1 Version Description
The OI4 is available in four functional versions, namely, SS42, SS44, SS48, and SS49. The OI4D is available in two functional versions, namely, SS48 and SS49.
Table 3-3 describes the versions of the OI4.
Table 3-3 Versions of the OI4
Item Description
Functional versions SS42 SS44 SS48 SS49
Differences l The SS42OI4 and SS44OI4 use the SC optical interface and support the optical interfaces of the Ie-4, S-4.1, L-4.1, and L-4.2 types.
l The SS48OI4 and SS49OI4 use the SFP optical interface and supports the optical interfaces of the S-4.1, L-4.1, and L-4.2 types.
Substitution The boards that have the optical interfaces of the same type can be substituted with each other.
Table 3-4 describes the versions of the OI4D.
Table 3-4 Versions of the OI4D
Item Description
Functional versions SS48 SS49
Differences l The SS48OI4D uses the SFP/SC optical interface and supports the optical interfaces of the Ie-4.1, S-4.1, L-4.1, and L-4.2 types.
l The SS49OI4D uses the SFP optical interface and supports the optical interfaces of the S-4.1, L-4.1, and L-4.2 types.
Item Description
Substitution The boards that have the optical interfaces of the same type can be substituted with each other.
3.2.2 Functions and Features
The OI4/OI4D transmits and receives STM-4 optical signals, performs O/E conversion for the STM-4 optical signals, extracts and inserts overhead bytes, and generates alarm signals on the line.
The OI4 is a 1xSTM-4 optical interface board.
The OI4D is a 2xSTM-4 optical interface board. The OI4D is available in two types: pluggable OI4D and integrated OI4D. The pluggable OI4D can be installed in slot IU1, IU2, or IU3. The integrated OI4D is integrated with the SCB. The optical port of the OI4D can be equipped with an SC connector or an SFP optical module. You can select an SC connector or an SFP optical module depending on requirements. When an SFP optical module is used, the maintenance of the optical module is convenient.
Table 3-5 provides the functions and features of the OI4/OI4D.
Table 3-5 Functions and features of the OI4/OI4D Function and
Feature OI4 OI4D
Basic functions Transmits and receives 1xSTM-4 optical signals.
Transmits and receives 2xSTM-4 optical signals.
Specifications of the optical interface
Supports different types of standard optical interfaces, namely, the Ie-4, S-4.1, L-4.1, and L-4.2. The characteristics of the optical interfaces comply with ITU-T G.957.
Specifications of the optical module
Provides the automatic laser shutdown (ALS) function (the 42OI4 does not provide the ALS function). The optical interface supports the function of setting the on/off state of a laser.
Service processing
Supports the processing of the VC-12, VC-3, and VC-4 services.
Time
synchronization function
Supports the high-precision time synchronization function to realize the synchronization of time over the entire network.
Overhead processing
l Processes the section overheads of STM-4 signals.
l Processes higher order path overheads.
l Supports the setting of byte reporting, byte transmitting, and K-byte passing-through.
l Provides the transparent data communication channel (DCC) and orderwire byte channel.
l Supports the setting and querying of the J0/J1/C2 byte.
Function and
Feature OI4 OI4D
Pointer processing
Processes the AU pointer.
Alarms and performance events
Provides rich alarms and performance events, thus facilitating the management and maintenance of the equipment.
Protection modes
l Supports the multiplex section protection (MSP) in slots IU1, IU2, and IU5.
l Supports the sub-network connection protection (SNCP).
Maintenance features
l Supports inloop and outloop at optical interfaces.
l Supports inloop and outloop on VC-4 paths so that faults can be located quickly.
l Supports the setting of the overhead byte to be sent/received.
l Supports the setting of the enabled state of the synchronization status message (SSM) on the line optical interface.
l Supports the pass-through test of the line K bytes.
l Supports the setting of the bit error threshold-crossing values and degrade thresholds.
l Provides the ALS function.
3.2.3 Working Principle and Signal Flow
The OI4/OI4D consists of the O/E converting module, data and clock restoration module, SDH overhead processing module, logic control module, and power unit.
Figure 3-2 shows the functional block diagram of the OI4/OI4D.
Figure 3-2 Functional block diagram of the OI4/OI4D
The O/E converting module converts a received STM-4 optical signal into an STM-4 electrical signal and sends the STM-4 electrical signal to the data and clock restoration module. The R_LOS alarm signal can be detected in the O/E converting module. The data and clock restoration module restores the clock signal and sends the clock signal and the STM-4 electrical signal to the SDH overhead processing module. Then, the SDH overhead processing module extracts the overhead bytes from the received STM-4 signal and sends the payload signal to the cross-connect unit through the backplane. The R_LOF alarm signal, R_OOF alarm signal, and other alarm signals are detected in the SDH overhead processing module.
Transmit Direction
The SDH overhead processing module inserts the overhead bytes into the electrical signal sent from the cross-connect unit and sends the electrical signal to the E/O converting module. Then, the E/O converting module converts the STM-4 electrical signal into an STM-4 optical signal and sends the STM-4 optical signal to fibers for transmission.
Logic Control Module
This module generates the timing clock signal and frame header for the board, controls the ALS function, and passes through the orderwire and ECC bytes between the two optical interface boards that form an ADM.
Power Unit
This unit provides DC power for all the modules of the board.
3.2.4 Front Panel
The front panel of the OI4/OI4D has an indicator, an interface, a bar code, and a laser safety class label.