This module converts the VC-4 signal from the mapping module into a signal that can be processed by the cross-connect unit. This module also performs the reverse process.
Logic Control Module
This module decodes each chip-controlled circuit on the TDA, loads the program, and communicates with the SCB.
Power Unit
This unit provides DC power for all the modules of the board.
5.7.4 Front Panel
The front panel of the TDA has indicators, interfaces, and a bar code.
Diagram of the Front Panel
Figure 5-15 shows the front panel of the TDA.
Figure 5-15 Front panel of the TDA
TDA RUNALM 232 422 A-2 A-1
Data/Audio interface Board indicators
Indicators
The front panel of the TDA has indicators that show the status of the board. Table 5-31 provides the meanings of the statuses of the indicators.
Table 5-31 Indicator on the front panel of the TDA
Indicator Status Meaning
ALM: red alarm indicator
Constantly off No alarm occurs on the board.
Flashing three times every other second
A critical alarm occurs on the board.
Flashing twice every other second
A major alarm occurs on the board.
Flashing once every other second
A minor alarm occurs on the board.
Constantly on The board self-check fails.
RUN: green running indicator
Flashing five times every second
The board is offline.
Flashing once every second
The board operates normally.
Interfaces
The front panel of the TDA has a 2 mm HM connector to provide interfaces. The silkscreen "232 422 A-2 A-1" on the connector indicates the type of signal that can be accessed.
Each of "A-1" and "A-2" indicates audio interfaces and can be inserted with one audio cable.
"A-1" indicates the 1-6 audio interfaces and "A-2" indicates 7-12 audio interfaces. Refer to Table 5-32.
The audio interfaces 1, 3, 5, 7, 9, and 11 can be connected to 2-/4-wire services. When 2-wire audio services are accessed, a 2-wire telephone line can be inserted in any interface of "A-1"
and "A-2". When 4-wire audio services are accessed, a 4-wire telephone line can be inserted in interface 1, 3, 5, 7, 9, or 11, and interfaces 2, 4, 6, 8, 10, and 12 must be set to unavailable on the T2000.
Table 5-32 Mapping relation between the accessed audio signal and the silkscreen
Item Value
A-1 1 2 3 4 5 6
Audio line 1 2 3 4 5 6
A-2 1 2 3 4 5 6
Audio line 7 8 9 10 11 12
"232" indicates an RS-232 data interface. The interface transmits/receives four channels of RS-232 data through an RS-232 cable. Each channel of signals has Rxd, Txd, and GND.
"422" indicates an RS-422 data interface. The interface transmits/receives four channels of RS-422 data through an RS-422 cable. Each channel of signals has LT+/LT- and LR+/LR-.
An RS-232/RS-422 cable has four wires of different colors. Refer to Table 5-33.
Table 5-33 Wire color of an RS-232/RS-422 cable and the corresponding signal
Cable Green Red Black White
RS-232 Rxd Txd GND Not defined
RS-422 LR- LR+ LT- LT+
5.7.5 Valid Slots
The TDA can be installed in slot IU4.
5.7.6 Parameter Settings
You can set the parameters for the TDA by using the T2000.
You can set the following parameters for the TDA by using the T2000:
l J2
l Service load indication
l Tributary loopback
For the description of each parameter, see 13.2 PDH Boards.
5.7.7 Technical Specifications
The technical specifications of the TDA include the parameters specified for electrical interfaces, dimensions, weight, and power consumption.
Parameters Specified for Electrical Interfaces
Table 5-34 lists the parameters specified for the electrical interfaces of the TDA.
Table 5-34 Parameters specified for the electrical interfaces of the TDA
Parameter Value
Nominal bit rate Audio: 64 kbit/s
Digital signal: 19.2 kbit/s Interface impedance Audio: 600 ohms
Maximum transmission distance (m)
l Audio: 4000
l RS-232: 15
l RS-422: 1000
Connector 2 mm HM connector
Mechanical Specifications
The mechanical specifications of the TDA are as follows:
l Dimensions (width x depth x height): 321.0 mm x 218.5 mm x 24.0 mm
l Weight: 0.7 kg
Power Consumption
The maximum power consumption of the TDA at room temperature (25°C) is 12.0 W.
6 SCB
About This Chapter
The SCB is a system control board and is installed in slot SCB. The SCB controls the entire OptiX 155/622H system and grooms services. Hence, the SCB must be configured for the OptiX 155/622H.
6.1 Version Description
The SCB is available in two functional versions, namely, SS46 and SS49.
6.2 Functions and Features
The SCB integrates the functions of the SCC unit, XC unit, STG unit, EOW unit, OI2D/OI4D/
O16D, and SP2D.
6.3 Working Principle and Signal Flow
The SCB consists of the SCC unit, STG unit, EOW unit, line unit, tributary unit, and XC unit.
6.4 DIP Switches
The SCB has the DIP switches that are used to set the running state of the board.
6.5 Front Panel
The front panel of the SCB has indicators, interfaces, a bar code, and a laser safety class label.
6.6 Valid Slots
The SCB can be installed in slot SCB.
6.7 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.
6.8 Parameter Settings
You can set the parameters for the SCB by using the T2000.
6.9 Technical Specifications
The technical specifications of the SCB include the parameters specified for interfaces, dimensions, weight, and power consumption.
6.1 Version Description
The SCB is available in two functional versions, namely, SS46 and SS49.
Table 6-1 describes the versions of the SCB.
Table 6-1 Versions of the SCB
Item Description
Functional versions SS46 SS49
Differences The SS46SCB and SS49SCB have different mapping software versions but have the same functions.
Substitution The versions can be substituted with each other.
The software of the SCC unit of the SCB is the NE software. The board software of the line board and tributary board is integrated with the NE software.
6.2 Functions and Features
The SCB integrates the functions of the SCC unit, XC unit, STG unit, EOW unit, OI2D/OI4D/
O16D, and SP2D.
Table 6-2 provides the functions and features of the SCB.
Table 6-2 Functions and features of the SCB Function and
Feature SCB
Cross-connect capability
l The higher order cross-connect capacity is 21.25 GB and the lower order cross-connect capacity is 5 GB.
l Supports the cross-connection at the VC-4, VC-3, and VC-12 levels, and realizes the service grooming between lines, tributaries, and the line and the tributary.
Function and
Feature SCB
Line functions l Provides two STM-1/STM-4/STM-16 optical interfaces. The optical interface supports the hot-pluggable SFP optical module.
l The STM-1 optical interface is named OI2D, the STM-4 optical interface is named OI4D and the STM-16 optical interface is named OI16D.
l The STM-1 optical interface can be equipped with the optical module of the S-1.1, L-1.1, or L-1.2 type. The STM-1 optical interface uses the SC/
LC connector.
l The STM-4 optical interface can be equipped with the optical module of the S-4.1, L-4.1, or L-4.2 type. The STM-4 optical interface uses the SC/
LC connector.
l The STM-16 optical interface can be equipped with the optical module of the S-16.1 type. The STM-16 optical interface uses the LC connector.
l Provides two synchronous timing sources for the clock unit.
l Supports the high-precision time synchronization function to realize the synchronization of time over the entire network.
l Processes section overheads and higher order path overheads.
l Supports the setting of K-byte reporting, K-byte transmitting, and K-byte passing-through.
l Provides the transparent DCC and orderwire byte channel.
l Supports the setting and querying of the J0/J1/C2 byte.
l Processes the AU pointer.
l Supports maintenance features such as inloop and outloop on VC-4 paths, setting of the overhead byte to be sent/received, pass-through test of the K bytes, and checking of K bytes.
l Supports the MSP and ALS function.
Tributary functions
l Accesses 16xE1 signals.
l Maps E1 signals into VC-12s asynchronously.
l Provides 75-ohm unbalanced interfaces and 120-ohm balanced interfaces. The characteristics of the interfaces meet the requirements specified in ITU-T G.703.
l Processes VC-12 path overheads, configures all service paths, monitors alarms and performance events on the service paths, and communicates with the SCC unit.
l Provides inloop and outloop to test the quality of E1 services or to locate a fault, thus facilitating the maintenance of the equipment.
l Provides synchronous timing sources for the clock unit.
Function and
Feature SCB
Clock functions
l Supports the Non-SSM protocol, standard SSM protocol and extended SSM protocol.
l Provides the synchronous clock signal for the boards in the system.
l Supports the following working modes: trace mode, holdover mode, and free-run mode.
l Supports the control of the priority of clock sources.
l Controls the clock source switching function.
l Supports the processing and setting of the S1 byte.
l Provides two 2048 kHz or 2048 kbit/s external clock interfaces whose impedance is 120 ohms.
Time function l Provides two high-precision time output interfaces. The time synchronization function complies with IEEE 1588 V2.
l The external time interface supports the output of the 1pps (also called the second pulse) and the high-precision time information.
l The 1pps interface uses the RS-422 level and the external time serial port uses the RS-232 level.
l The 1pps interface and the external clock interface use the same interface.
Hence, when the 1pps function is enabled, the external clock function is invalid.
l The external time serial port and the COM3/COM4 transparent data interface use the same interface. Hence, when the external time function is enabled, the transparent data interface function is invalid.
System control functions
l Exchanges information with other boards, realizes the data configuration function, and collects performance data and alarm data.
l Provides a standard Ethernet interface and RS-232 data terminal equipment (DTE) interfaces so that the NMS can manage the equipment.
Orderwire functions
l Provides an orderwire interface and supports conference calls and the broadcast function.
l Provides four RJ-45 RS-232 serial data interfaces and supports point-to-multipoint connection of equipment to transparently transmit user data.
l Provides 4-input/2-output housekeeping interfaces. The housekeeping input interface is used to monitor the status of the external equipment and the housekeeping output interface is used to output alarm indications and control the external equipment.
Other functions
l Detects and reports performance events and alarms.
l Provides 18 embedded control channels (ECCs).
l The external clock interface can transparently transmit DCC bytes that are used to exchange management information when the OptiX 155/622H forms a network with the third-party equipment.
l Generates alarms when the fans are faulty, and manages the fans.
NOTE
The SS46SCB does not support the IEEE 1588 V2 time feature, orderwire phone, or transparent data port.
In addition, slot IU3 does not support ECC communication.
6.3 Working Principle and Signal Flow
The SCB consists of the SCC unit, STG unit, EOW unit, line unit, tributary unit, and XC unit.
Figure 6-1 shows the functional block diagram of the SCB.
Figure 6-1 Functional block diagram of the SCB
IU1
IU2
IU3
IU4