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Product Manual - DM991 Series V Family - 204.4092.08

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Figure 28. DM991 - LAL Test on E1 Interface

12.3. Digital Interface Tests

12.3.1. LDL Test

This test helps the verification of the internal and external data link status. Two loopbacks are done. The
internal loopback makes the data coming from the G.shdsl interface to be retransmitted. The external
loopback makes the external data coming from the digital interface to return to it. During LDL testing the
data in the digital interface remains in sync with the clocks configured for regular operation. Figure 29
shows the test conditions.

Figure 29. DM991 – LDL on Digital interface

When the modem is configured by DIPs (DIP B6 = OFF), it is not possible to remotely run tests through
the terminal.

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Summary of Contents for DM991C

Page 1: ...DM991 SERIES V DM991C DM991CE DM991S DM991SE PRODUCT MANUAL 204 4092 08 rev 08 Date 8 12 2008 ...

Page 2: ...rs done by DATACOM unauthorized personnel This warranty does not cover repairs done at the customer s site All equipments must be sent to DATACOM to be repaired Quality Management System certified by DQS according to ISO9001 Register number 287097 QM Although this document has been written with care the company does not assume responsibility for occasional mistakes and omissions in its content Lik...

Page 3: ...nt Support o E mail suporte datacom ind br o Phone 55 51 3358 0122 o Fax 55 51 3358 0101 Sales o E mail comercial datacom ind br o Phone 55 51 3358 0100 o Fax 55 51 3358 0101 Internet o www datacom ind br Address o DATACOM o Av França 735 Porto Alegre RS Brasil o CEP 90230 220 ...

Page 4: ...ent or a part is ESDS Electrostatic Discharge Sensitive It should not be handled without grounding wrist strap or equivalent Non ionizing radiation emission IWEEE Directive Symbol Applicable in the European Union and other European countries with separate collection systems This symbol on the product or its packaging indicates that this product must not be disposed of with other waste Instead it i...

Page 5: ...ACE 22 5 G 703 G 704 INTERFACE 25 5 1 DM991S SE 25 5 2 DM991C CE 26 6 ETHERNET INTERFACE 27 6 1 Ethernet physical level 27 6 2 Remote Bridge 27 6 3 Ethernet Interface Configurations 27 7 STRAPS 29 7 1 DM991S SE 29 7 1 1 G 703 Interface Cable Selection E4 29 7 1 2 Output Coaxial Cable Grounding E10 29 7 1 3 Input Coaxial Cable Grounding E11 29 7 1 4 G 703 Interface Pinout E12 to E15 E27 to E30 and ...

Page 6: ...pment to be Configured 45 10 5 Configuration Menu 46 10 5 1 Equipment General Configurations Menu 48 10 5 2 G shdsl Interface Configuration Menu 49 10 5 3 Digital Interface Configuration Menu 50 10 5 4 E1 Interface Configuration Menu 51 10 5 5 Bridge Interface Configuration Menu only for DM991CE and DM991SE 52 10 6 Test Menu 52 10 6 1 G shdsl Interface Test Menu 54 10 6 2 Digital Interface Test Me...

Page 7: ...s for Coaxial Cable 74 16 2 2 G 703 Interface Electricial Characteristics for Twisted Pair 74 17 PANEL LEDS 75 17 1 DM991S SE Modems Front Panel LEDs 75 17 2 DM991C CE Modems Front Panel LEDs 76 18 STRAPS AND DIP SWITCHES MAP 78 18 1 DM991S SE 78 18 2 DM991C CE 78 18 2 1 PCI rev 03 or lesser 79 18 2 2 PCI rev 04 or higher 80 19 TECHNICAL SPECIFICATIONS 81 19 1 Environmental Conditions 81 19 2 Powe...

Page 8: ...e 39 Figure 19 Digital Interface Operating with External 40 Figure 20 Digital Interface Operation with CT104 sinc CT113 40 Figure 21 Digital Interface with CT113 Unlooped to CT114 41 Figure 22 Configuration memories diagram 46 Figure 23 DM991 Local Digital Loopback on G shdsl Interface 62 Figure 24 DM991 Local Analogue Loopback Test on G shdsl Interface 62 Figure 25 DM991 BERT Test on G shdsl Inte...

Page 9: ...nterface Pinout 24 Table 12 DM991S SE Pinout in the G 703 Screw connector block 25 Table 13 DM991S SE G 703 Telebrás DB25 Standard Pinout 25 Table 14 DM991S SE G 703 Proprietary Pinout DB25 26 Table 15 DM991C CE G 703 RJ48 Pinout 26 Table 16 Digital Interface Speed Configuration 33 Table 17 Internal Clock Selection of Equipment 33 Table 18 DM991S SE DIPs Summary 36 Table 19 Multiframe structure 71...

Page 10: ...capacities of the equipment The power supply where the supply cable is connected must be positioned near the equipment and be on an easily accessible location because the equipment is turned on and off through it Before connecting any cable to the equipment make sure that the grounding system is functional To prevent risks of electric shock before opening the DM991C CE equipments disconnect the po...

Page 11: ...991S 4W Telebrás standard card Can be used in cabinets or sub racks standard for 20 modems Its G shdsl interface may operate with 2 on 4 wires DM991SE 2W The same as the DM991S model however it has the option to work as Bridge as well Its G shdsl interface works on 2 wires DM991SE 4W The same as the DM991S model however it has the option to work as Bridge as well Its G shdsl interface may operate ...

Page 12: ...91S SE DB9 Connector Pinout RJ45 The RJ45 connector is used for the Ethernet interface Its pinout description is found on Table 2 Function Signal RJ45 Origin Received data wire OUT 1 DM991SE Received data wire OUT 2 DM991SE Transmited data wire IN 3 LAN Transmited data wire IN 6 LAN Table 2 DM991SE RJ45 Connector Pinout Keys The keys function is the testing execution o LAL Local Analogue Loopback ...

Page 13: ...s A and B are for interface input IN and pins C and D are for interface output OUT More details are provided in the Table 12 2 2 DM991C CE 2W 4W 2 2 1 Front Panel The Figure 6 represents the DM991C 2W modem panel Figure 7 represents the DM991CE 2W modem panel Figure 8 presents the DM991C 4W modem and the Figure 9 presents the DM991CE 4W modem Figure 6 DM991C 2W Front Panel Figure 7 DM991CE 2W Fron...

Page 14: ...back panel of the DM991C CE modens Figure 10 DM991C CE Back Panel 75ohms Connectors connection for G 703 interface for coaxial cable with 75ohms impedance available in BNC connectors 120ohms Connector connection for G 703 interface for twisted pair with 120ohms impedance available in RJ 48 connector Digital Connector digital interface connection according to recommendation V 35 or V 36 V 11 They a...

Page 15: ...to other interfaces in the equipment It can be configured to operate in quasi synchronous synchronous or automatic selection modes It can be configured to operate as per Annex A B or with automatic selection defined on recommendation G 991 2 It supports operation with rates up to 2 304 kbit s per line according to annexes A and B in standard G 991 2 It can carry from 1 to 36 64 kbit s timeslots wi...

Page 16: ... operation In this phase many parameters are set the final transmission rate Annex to be used A or B type of information to transport TPS TC Transmission Protocol Specific Transmission Convergence type of transmission frame plesiochronous or synchronous and some others If the interfaces do not converge to a common configuration the two equipments abort the transmission and they do not pass to the ...

Page 17: ...perations Channel and it also has a data error identification mechanism CRC6 The frame G shdsl also allows to transmit CAS information Channel Associated Signilling from link E1 O H O H O H O H TSn TS1 TS2 Stb Sub Block 1 Sub Block 2 Sub Block 3 Sub Block 4 Sub Block 5 Sub Block 6 Sub Block 7 Sub Block 8 Sub Block 9 Sub Block 10 Sub Block 11 Sub Block 12 Frame Sync Payload Block Payload Block Payl...

Page 18: ... bit 16 3k 41 crc5 Cyclic Redundancy Check 5 3k 42 crc6 Cyclic Redundancy Check 6 3k 43 eoc17 EOC bit 17 3k 44 eoc18 EOC bit 18 3k 45 eoc19 EOC bit 19 3k 46 eoc20 EOC bit 20 3k 47 4k 46 b4 Payload block 4 4k 47 stb1 Stuff bit 1 4k 48 stb2 Stuff bit 2 4k 49 stb3 Stuff bit 3 Table 8 G shdsl Frame Structure During the data mode link failures can occur Such failures are monitored and reported to the u...

Page 19: ...ce is indicating LOSWF the DSL interface status LED blinks eight times per second i e at 4 Hz 3 5 G shdsl Interface Configurations The operation modes are all configured by software The explanation of the configuration parameters of the G shdsl interface is presented below 3 5 1 Terminal Type Indicates if the interface operates as LTU central office or as NTU subscriber When the modem is configure...

Page 20: ...typically encountered within the North American network Annex B describes those specifications that are unique to lines operating under conditions such as those typically encountered within European networks For the automatic selection mode the LTU will employ the NTU selected annex If the NTU accepts any type of annex Annex B will be used 3 6 Performance The interface performance is directly rela...

Page 21: ...en operating on 4 wires this modem uses ports A and B as a single interface being able to transmit on a longer reach and more bandwidth The number of timeslots used in the 4 wires operation is always pair Nx128kbit s that is if the configuration is set for an odd number automatically one more timeslot will be used 3 8 Electrical Protection When the analogue lines of the G shdsl interface pass thro...

Page 22: ...or equipment with a pinning selections between ISO2110 Amd 1 and Telebrás standard through straps Data and clock signals are the differential balanced type according to ITU T s V 11 recommendation Signals CT107 CT108 CT109 CT140 CT141 and CT142 follow the characteristics of recommendation V 28 compatible with recommendation V 10 Control signals CT105 and CT106 can be configured by straps to follow...

Page 23: ... 23 ERCb 23 8 140 Digital Remote Loopback Request RDL 21 N 12 DTE 141 Local Analogue Loopback request LAL 18 L 21 DTE 142 Test indicator TST 25 n NN 25 DM991 CT Function Signal Signal source 113 DTE transmission clock DTE 114 Transmission clock DM991 103 Transmitted data DTE 104 Received data DM991 115 Reception clock DM991 128 External reception clock DTE Table 10 V 35 Interface Pinout For DM991S...

Page 24: ... 14 23 DTE 141 Local Analogue Loopback request LAL 18 10 8 DTE 142 Test indicator TST 25 18 12 DM991 114 Transmission clock DM991 CT Function Signal Signal source 109 G SHDSL interface synch DM991 113 DTE transmission clock DTE 105 Request to send DTE 106 Ready to send DM991 103 Transmitted data DTE 104 Received data DM991 115 Reception clock DM991 128 External reception clock DTE Table 11 V 35 In...

Page 25: ... to the ground wire through this strap The same identification procedure of which screw has been grounded must take effect in this case In the sub rack usually the inferior TX OUT screw is grounded Modem signal G 703 is available on Dial Backup terminals in the terminal strip Function Signal screw connector block Signal source Received data OUT core BkpC DM991 Received data OUT shield BkpD DM991 T...

Page 26: ...nel TX OUT On models DM991C CE with PCI rev 03 or lower this applies only to the input channel RX IN in this case the external output coaxial cable network TX OUT is always connected to the ground The G 703 signal output is available on the BNC OUT connector or between the pins 4 and 5 of the RJ48 The G 703 signal input is available on the BNC IN connector or between the pins 1 and 2 of the RJ48 F...

Page 27: ...bridge operates on the MAC level of the Ethernet interface In this way the tributary is completely transparent for upper layers protocols such as TCP IP UDP etc The bridge local address table can store up to 1 000 MAC addresses If a station remains inactive for more than five minutes its address will be removed from the table The process of filtering the packets to be transmitted imposes no limita...

Page 28: ...d it be operating on Full Duplex mode pause frames will be used Should it be on Half Duplex mode back pressure mode will be used On pause frames when there is LAN clogging the equipment will send pause frames to the link partner so that it will wait for a determined time until sending the next data package On back pressure when there is LAN clogging the equipment generates net collisions to limit ...

Page 29: ... shield to the signal ground depends on the pinout configured according to Table 12 Table 13 or Table 14 Position 0 2 Isolated factory standard 7 1 3 Input Coaxial Cable Grounding E11 Allows the coaxial cable shield to be grounded Position GND Connects the input coaxial cable shield to the signal ground depends on the pinout configured according to Table 12 Table 13 or Table 14 Position ISOL Isola...

Page 30: ... V 11 Position 0 2 Select V 35 factory standard 7 1 6 DB25 Connector Pinout E31 to E41 and E48 to E59 Allow to select the pinout standard for the DB25 connector of the V 35 V 36 V 11 digital interface Position 0 1 Telebrás standard pinout Position 0 2 ISO2110 Amd 1 standard pinout factory standard 7 2 DM991C CE 7 2 1 G 703 Interface Cable Selection E2 E3 and E25 Position 120 selects the use of twi...

Page 31: ...5 Pinning on connector DB25 E500 to E522 Optional As an option DM991C CE equipment can come from the factory with straps E500 to E522 These straps allow you to select the pinning standard for connector DB25 in digital interface V 35 V 36 V 11 Position 0 1 Telebrás standard pinning Position 0 2 ISO2110 Amd 1 standard pinning factory default Be careful as not to let those straps be in the grounded p...

Page 32: ...ributary interface the line rate being defined by the LTU configuration When the keys are all OFF the modem operates at 2048kbit s 32 channels If the E1 interface is enabled DIP B4 on OFF the data will be transmitted and received without frame synch search The configurations set in the B1 to B3 DIP switches will be ignored When one or more of the keys is ON the interface will operate with the numb...

Page 33: ...ON 23 1472 kbit s ON ON OFF OFF OFF 24 1536 kbit s ON ON OFF OFF ON 25 1600 kbit s ON ON OFF ON OFF 26 1664 kbit s ON ON OFF ON ON 27 1728 kbit s ON ON ON OFF OFF 28 1792 kbit s ON ON ON OFF ON 29 1856 kbit s ON ON ON ON OFF 30 1920 kbit s ON ON ON ON ON 31 1984 kbit s Table 16 Digital Interface Speed Configuration These are the DIP switches factory default configurations 8 2 Clock Selection DIPs ...

Page 34: ... 3 LDR Enabling DIP A8 When ON allows the LDR request to be accepted When OFF rejects the LDR request 8 4 Cross Connect CAS DIP B1 When ON enables the E1 interface CAS transmission to the line When OFF CAS synch is not generated or verified This DIP has no function when DIP B4 or DIP B7 is set to ON 8 5 Timeslot 16 Enabling DIP B2 When ON enables the data transmission through timeslot 16 of the E1...

Page 35: ...s configuration will be used until the management system programs a different configuration To store the configuration done by the manager in a non volatile E2PROM the request must be done via manager or terminal This way the equipment can recover the configuration even after being shut off When OFF it is possible to monitor the modem through the manager but the configuration is inhibited The mode...

Page 36: ...disabled OFF Enabled ON disabled OFF Enabled ON disabled OFF B8 4W Operation Converter Mode B5 Terminal type B6 Configuration B7 Ethernet B3 CRC4 B4 Interface B1 Cross Connect CAS B1 Timeslot 16 A6 A7 Transmissio clock A8 LDR request Table 18 DM991S SE DIPs Summary See Table 16 Factory standard position This DIP loses purpose when DIP B7 is se to ON Only for DM991SE model Only for DM991S model Onl...

Page 37: ...sub racks Can be integrated to the DATACOM equipments management system using the DmView software Through the remote management that can be integrated to the DATACOM equipments management system using the DmView software This configuration can be used when the DM991 is the remote to a DM705 equipment as shown on Figure 14 Figure 14 DM991 Managed as DM705 remote 9 2 Equipment Clocks 9 2 1 Transmiss...

Page 38: ...al interfaces continuous arrows Also according to the selection of regenerated clock a loop is done in the clock so that it is used in the data transmission by the DSL interface traced arrow Back in the LTU side the equipment uses the clock received from the DSL interface for the E1 and digital interfaces Figure 15 Internal and Regenerated Clocks in Plesiochronous Mode Figure 16 shows how the cloc...

Page 39: ... are synchronized b It is not possible to do an external clock loop in the LTU in this mode c When using a regenerated clock the external equipment should provide the clock with a minimum accuracy of 32ppm for proper modem operation 9 3 Digital Interface Clocks 9 3 1 Clock Source In this mode the digital interface uses as transmission clock CT114 the one provided by equipment clock source Figure 1...

Page 40: ...clock Figure 20 shows how a V 35 configured as CT104 sinc CT113 works when a DM991 is connected to an ECD equipment The scheme is the same as the one shown in the External mode except that the CT113 received by the DM991 is also used to control the CT104 as the doted arrow shows The CT115 does not alter itself in this way Figure 20 Digital Interface Operation with CT104 sinc CT113 9 3 4 CT113 Unlo...

Page 41: ...ock signal phase CT114 Used to compensate problems generated by delays in some routers 9 4 Converter Mode Equipment DM991S and DM991C can also operate as interface converters converting G 703 signals bit rate of 2048kbit s with frame structure according to G 704 to V 35 or V 36 V 11 interface signals In this mode the G shdsl interface is disabled The digital interface and E1 tributary continue ope...

Page 42: ... The terminal has a 10 minute timeout in a way that if nothing is typed in that time it returns to the password identification screen Bellow are described the configuration and management menus D A T A C O M DM991C G SHDSL Modem E1 and V 35 Interfaces 1 Choose equipment to configure 2 Equipment information 3 Terminal access password configuration 4 Change terminal language E Exit R Exit and reset ...

Page 43: ... version 1 Serial number 278742 Release date mm dd yy hh mm 01 04 06 05 52 pm E2PROM version 1 Number of after factory resets 56 Factory code 7 ESC Back When this option is chosen the following parameters will be presented Product code Firmware version Software boot version Hardware version Serial number Release date E2PROM version Number of after factory resets updated at each system reset Factor...

Page 44: ... 2 Password alteration is used to alter the password which should have from 5 to 15 characters The user must type in the old password and then twice the new password 10 3 Language Configuration D A T A C O M DM991C G SHDSL Modem E1 and V 35 Interfaces Change Terminal Language Language English Ingles ESC Exit ENTER Save and Exit In this menu it is possible to choose the terminal language The availa...

Page 45: ...ipment to be configured is chosen The first equipment on the list is always the local For each manageable equipment there is a Main Menu distributed in the following way D A T A C O M 1 DM991C G SHDSL Modem E1 and V 35 Interfaces Main Menu 1 Configuration menu 2 Tests menu 3 Status menu 4 Performance menu F Firmware download to local equipment Option ESC Back 1 Configuration menu allows the genera...

Page 46: ... on to the E2PROM memory when save configurations on E2PROM 4 is selected and is passed on to the user memory with the command Refresh configurations 3 User memory contains the configurations the user locally programmed via terminal or remotely via SNMP It is where the information of what has been configured on the terminal screens is stored The user memory is passed on to the equipment memory whe...

Page 47: ...ry configuration will show on the configuration field If any adjustments are necessary in the user configuration partially active configuration will show and if it is not possible to activate the configurations Invalid temporary configuration will show 2 Apply changes this option makes the equipment try to apply the user configurations If the configurations are applied completely them the status i...

Page 48: ...figures the transmission clock of the equipment The options are internal and regenerated of the DSL E1 or digital interface Enable destructive configuration enables or disables the destructive configurations for the remote management It is necessary to enable this object in case the user wants to disable the remote management through the EOC on the G shdsl interface or to disable the G shdsl inter...

Page 49: ...through the management Enable RDL reception informs if the interface should recognize and accept the LDR request through the remote modem and go into loop Number of channels It can range from 1 to 36 2 wire channels and 1 to 72 4 wire channels Remote management Allows to configure the G shdsl interface management channel or to disable it Operation mode determines if the modem operates as LTU centr...

Page 50: ...ntrol signal generated by the DTE signaling that the terminal is ready should be considered or ignored forced ON Clock Defines which clock will be used to sample the CT103 o General synch source the interface will use as clock the equipment clock source regenerated from an interface or internal o External CT113 the interface will use the CT113 signal to sample the CT103 o CT104 sync CT113 the inte...

Page 51: ...igured as IDLE Number of channels configures the number of interface timeslots Initial timeslot configures the number of the initial data channel In case CAS is disabled the initial channel must be 01 Channel signaling indicates which signaling type will be used in timeslot 16 o Disabled no signaling is transmitted Only in this configuration can the timeslot 16 be enabled for data o CAS emulation ...

Page 52: ...t TAB Change N ext Enable operation enables or disables the interface Wan data rate number of timeslots used on the interface Nx64kbit s up to the aggregate limit Duplex chooses between the operational modes o Half Duplex uses a single band direction at a time o Full Duplex uses both band directions simultaneously Link speed chooses Ethernet port speed in the LAN direction between 100Mbit s or 10M...

Page 53: ... LDR test being run by the local equipment o Running LDR RXLDR LDR test being run by remote equipment o Running LAL LAL test being run For the BERT tests BERT status indicates the test status BERT test time seconds shows for how long the test has been running BERT error time seconds shows for how long the test has been in error Status of test indicates the test running o Running BERT only BERT is ...

Page 54: ...urrent test 2 LDL starts LDL tes 3 LAL activates LAL test can only be run in the local equipment 4 LDR starts LDR test 5 Initiate BERT sequence activates BERT test 6 Insert BERT error generates bit error in the BERT sequence being transmitted 7 Reset BERT counters resets counters of total time and test error time 10 6 2 Digital Interface Test Menu D A T A C O M 1 DM991C G SHDSL Modem E1 and V 35 I...

Page 55: ...ivates LAL test 10 7 Status Menu On this menu are available the information on the equipment status and each interfaces as a whole D A T A C O M 1 DM991CE G SHDSL Modem With Ethernet Bridge Status Menu G Equipment status D G SHDSL interface V V 35 interface E E1 interface B BRIDGE interface Option ESC Back G Shows general operation equipment status D Shows G shdsl interface status V Shows digital ...

Page 56: ...een running since the last reset Number of after factory resets number of equipment resets since the equipment left the factory 10 7 2 G shdsl Interface Status Menu D A T A C O M 1 DM991C G SHDSL Modem E1 and V 35 Interfaces G SHDSL Status Operation Active Current test Not running BERT test result Not running Link No carrier Loop attenuation Not trained SNR margin Not trained Data rate Not trained...

Page 57: ...ake Annex Shows the Annex A or B negotiated during the handshake Modulation Shows the modulation 16 TCPAM negotiated during the handshake 10 7 3 Digital Interface Status Menu D A T A C O M 1 DM991C G SHDSL Modem E1 and V 35 Interfaces V 35 Status Operation Active Current test Not running CT105 RTS Forced ON CT108 DTR Forced ON CT109 DCD ON CT113 XTC Ignored CT128 ERC Forced OFF CT103 TD All 1s CT1...

Page 58: ...ng on the configured frequency Ignored means disabled On means operating properly and Off means not operating properly CT103 TD Report the type of information transmitted for digital interface CT104 RD Report the type of information received for digital interface 10 7 4 E1 Interface Status Menu D A T A C O M 1 DM991C G SHDSL Modem E1 and V 35 Interfaces E1 Status Operation Active Current test Not ...

Page 59: ...mation will be updated The key R restarts the performance counters D A T A C O M 1 DM991C G SHDSL Modem E1 and V 35 Interfaces G SHDSL Performance Code violations CV 0 Errored seconds ES 0 Severely errored seconds SES 0 LOSW seconds LOSWS 0 Unavailable seconds UAS 0 Loop attenuation dB Not trained Signal quality dB Not trained Time since last counters reset s 7741 ESC Back ENTER Refresh R eset Cou...

Page 60: ...since last counters reset s time in seconds since the last above described performance counters reset 10 9 Terminal Firmware Download D A T A C O M 1 DM991C G SHDSL Modem E1 and V 35 Interfaces Firmware Download Follow instructions below to send firmware file or press any key and wait a few seconds to abort download Action Start Download On the terminal on the main screen of the equipment press F ...

Page 61: ...uipment terminal is being used it is not possible to remotely manage the equipment Management from the G shdsl link is done by the EOC channel Embedded Operations Channel which does not occupy the data band also called out of band management having a rate of 3 33kbit s The exchanged packets follow the format set by the G 991 2 rule and they flow by the EOC proprietary messages range To use the EOC...

Page 62: ...l data link status verification Two loopbacks are done The internal loopback makes the data coming from the tributaries to return to them The external loopback makes the external data coming from the G shdsl to be retransmitted by this interface Figure 23 shows the test conditions Figure 23 DM991 Local Digital Loopback on G shdsl Interface 12 1 2 Local Analogue Loopback Test LAL The local analogue...

Page 63: ...ERT The equipment will remain on testing conditions until the key in the case of DM991S SE modems or the CT141 are deactivated Figure 26 DM991 RDL Test on G shdsl interface 12 2 E1 Interface Tests 12 2 1 LDL Test This test helps the verification of the internal and external data link status Two loopbacks are done The internal loopback makes the data coming from the G shdsl interface to be retransm...

Page 64: ...es the data coming from the G shdsl interface to be retransmitted The external loopback makes the external data coming from the digital interface to return to it During LDL testing the data in the digital interface remains in sync with the clocks configured for regular operation Figure 29 shows the test conditions Figure 29 DM991 LDL on Digital interface When the modem is configured by DIPs DIP B6...

Page 65: ...rface The converter will remain in the test conditions until the key or CT141 is deactivated or until the test is stopped by Telebrás management Figure 30 LAL test Converter Mode 13 2 Local Digital Loopback Test LDL Pressing the LDL DM991S key or activating this test by management forces the equipment to run the local digital loopback test When the digital interface is being used the DTE transmiss...

Page 66: ...Product Manual DM991 Series V Family 204 4092 08 66 Figure 31 LDL Test Converter Mode ...

Page 67: ...al and choose the equipment to which the firmware will be sent On the main menu screen press F At the bottom of the screen a message will show up indicating the download status To start sending the user must wait until a message appears indicating that the download can be started When this message appears click on File Send File Now select the firmware marking the binary option on the lower left c...

Page 68: ... DB9 or DB25 female connector on the PC side The pinout is given on Table 1 for the DM991S SE and on Table 2 fro the DM991C CE Always observe the instructions of security during the installation operation or maintenance of this product Installation adjustment or maintenance must be carried through only by qualified trained and authorized people Before connecting any cable to the equipment make sur...

Page 69: ...the stamp ETHERNET in the front panel for DM991SE and DM991CE 15 3 Accessory 15 3 1 Adapter Cable DB25 X DB25 2BNC The modems card DM991S DM991SE offer a proprietor pinout for use of digital interface and E1 tributary where these two interfaces may be available in DB25 connector of the sub rack For this application the DATACOM offers the adapter cable DB25 x DB25 2BNC This cable presents 1 DB25 ma...

Page 70: ...on rate is 8000 times per second resulting in a 64kbit s rate for each timeslot The number of user available timeslots for the user is at most 31 because timeslot 0 is used for frame synchronism In telephony applications employing channel associated signaling CAS only 30 timeslots are available for timeslot 16 transports CAS signaling The frame structure can be seen on Figure 33 Figure 33 ITU T G ...

Page 71: ...there may be other types of multiframe that are completely independent among them and superimposed over the basic multiframe 16 1 1 CRC4 Multiframe Made up by 16 frames and uses Si bit of timeslot 0 of the frames to perform the Cyclic Redundancy Check 4 procedure making it possible to evaluate transmission quality This multiframe always starts at a frame that has FAS The multiframe structure is id...

Page 72: ...to point specific aplications Sa4 to Sa8 mut remain on 1 when not being used and traverssing an international barrier The E bit is used to indicate CRC4 error The normal bi status is 1 When a CRC4 error is detected the bit corresponding to the sub multiframe in which the error was detected is set to 0 C1 to C4 are used to transmit CRC4 code Timeslot 0 which contains the 0011011 sequence is define ...

Page 73: ...hannel numbers refer to phone channels Timeslots 1 to 15 and 17 to 31 correspond to the phone channels 1 to 30 X0 X2 are the x bits of the G 704 regulation usually set to 1 Table 21 CAS Multiframe Structure 16 2 Electrical Characteristics The E1 line signal follows the HDB3 High Density Bipolar 3 coding from ITU G 703 recommendation which is an improvement in the AMI Alternate Mark Inversion codin...

Page 74: ...4 nanoseconds Rate between the positive and negative pulse amplitudes in the median point of a pulse width from 0 95 to 1 05 Rate between the positive and negative pulse widths in nominal half amplitude from 0 95 to 1 05 16 2 2 G 703 Interface Electricial Characteristics for Twisted Pair Rate 2048kbit s 50ppm Pulse format rectangular Number of pairs for each transmission direction 1 symmetric pair...

Page 75: ...nterface Blinks No carrier Turned off Handshake Blinks once a second most of the time turned off Training On time equal to off time blinking once every second 1Hz TDM not aligned On time equal to off time blinking once every second 1Hz LOSWD or LOSWF On time equal to off time blinking four times every second 4Hz CRC error or no CAS synch Blinks once a second most of the time on In synch Turned on ...

Page 76: ...ce a second most of the time turned off No frame synch Blinks once a second most of the time turned off Remote Alarm Indication Blinks once a second most of the time on No CAS synch Blinks once a second most of the time on No CRC4 synch Blinks twice a second most of the time on Frame CAS and CRC4 synch Turned on Link Ethernet Turned on Activity on the Interface Blinks No carrier Turned off Handsha...

Page 77: ... will represent data from interface E1 or data from the Ethernet interface only in DM991SE if interface E1 is disabled Only for DM991CE Ø In the 4W model this LED is replaced for 109A line A and 109B line B LEDs The operation of LEDs remains the same Only on model 4W when configured for 4 wires ...

Page 78: ...991 Series V Family 204 4092 08 78 18 STRAPS AND DIP SWITCHES MAP 18 1 DM991S SE Figure 35 DM991S SE Straps and DIPs map 18 2 DM991C CE DM991C CE models have different strap positions depending on the PCI revision used ...

Page 79: ...Product Manual DM991 Series V Family 204 4092 08 79 18 2 1 PCI rev 03 or lesser Figure 36 DM991C CE Map of Straps PCI rev 03 ou inferior Optionally available on demand ...

Page 80: ...Product Manual DM991 Series V Family 204 4092 08 80 18 2 2 PCI rev 04 or higher Figure 37 DM991C CE Map of Straps PCI rev 03 ou superior Optionally available on demand ...

Page 81: ...aw in the place where this equipment will be installed This includes adequate devices of protection sizing and protection to the capacities of the equipment Always observe the instructions of security during the installation operation or maintenance of this product Installation adjustment or maintenance must be carried through only by qualified trained and authorized people Before connecting any c...

Page 82: ... protection ground Figure 38 Power Cable Pinout DM991C CE Minimum power V Maximum power V AC 50 60 Hz 93 250 DC 36 72 Table 25 Power Input Range DM991C CE The power supply where the supply cable is connected must be positioned near the equipment and be on an easily accessible location because the equipment is turned on and off through it In case of using DC voltage you must be careful so that the ...

Page 83: ...6 6mm x 316 5mm width x height x depth The dimensions are according with figures 1 and 2 of the 225 540 780 regulation 19 4 2 DM991C CE The equipment is presented in a desktop with 195mm width 200mm depth and 44mm height without the rubber feet 46mm with the rubber feet 19 5 Weight 19 5 1 DM991S SE The equipment weighs around 0 265kgf 19 5 2 DM991C CE The equipment weighs around 0 700kgf ...

Page 84: ...el category I telecom product s certification o 225 540 780 mechanics and consumption only DM991S SE o 225 540 781 General Structure Specifications of Management Network for Standard Modems only DM991S SE CISPR o Publication 22 Anatel o Annex to Resolution No 238 dated November 9 th 2000 o Annex to Resolution No 442 dated July 21 st 2006 IEC o IEC61000 4 2 IEC61000 4 3 IEC61000 4 4 IEC61000 4 5 IE...

Page 85: ...AC voltmeter to measure the voltage between these pins If there is voltage difference check if the modem and the PC are properly grounded It is not necessary to turn the equipment off to plug in the serial cable if the above conditions are met In case of using DC voltage you must be careful so that the equipment protection earth cable green cable with yellow line related to the central socket pin ...

Page 86: ...92 08 86 The described equipment in this manual is sensible to the static electricity Before handling any described equipment in this manual verify if using devices of protection against static electricity and if these are functioning correctly ...

Page 87: ...kommt muss die Spannung zwischen diesen beiden Stiften mit einem AC Voltmeter gemessen werden Sollte eine Potentialdifferenz festgestellt werden Erdung der Anlagen überprüfen Wenn die obigen Bedingungen eingehalten werden braucht die Anlage zum Anschluss des seriellen Kabels nicht ausgeschaltet zu werden Wenn Gleichstrom verwendet wird darauf achten dass die Schutzerdung der Anlage grüne Leitung m...

Page 88: ...dbuch beschriebenen Anlagen sind empfindlich gegen statische Elektrizität Bevor irgendeine in diesem Handbuch beschriebene Vorrichtung berührt wird sich vergewissern dass Schutzvorrichtungen gegen statische Elektrizität getragen werden und dass sie korrekt funktionieren ...

Page 89: ...Phone 55 51 3358 0100 Support 55 51 3358 0122 Fax 55 51 3358 0101 www datacom ind br ...

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