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ATL TELECOM USER GUIDE

AM2048A OS/OM

27

4.9.3.3

Structured Working, CRCs Enabled

FIGURE 4.9.3: STRUCTURED WORKING, CRCS ENABLED

In this case, the CRCs are checked and errored blocks are indicated back across the user
interface by use of the E bits.

This is the least ambiguous mode of operation from a performance monitoring point of view
because each transmission section is covered by its own independent CRC check.

To set up this configuration, go to the “Configuration > User Port” Menu and select
Rx Unframed

( )

Rx Framed

(*)

Rx CRC4

[X]

Tx TSO Transparent

( )

Tx TSO Generate

(*)

Tx CRC4

[X]

In this mode of operation, the test loop activation messages defined in ETS 300 233 are
passed to and from the LT over the V3 interface.

CRC4

CRC4

NTU

ELU

TE

CRC4G

Tx

TS0

Rx

CRC4M

CRC4G

Tx

TS0

Rx

CRC4M

HDSL

CRC6

CRC4G

Tx

TS0

Rx

CRC4M

CRC4G

Tx

TS0

Rx

CRC4M

HDSL

CRC6

ET

T

V3

E

E

E

E

FAW

A

SA4
SA5
SA6
SA7
SA8

FAW

A

SA4
SA5
SA6
SA7
SA8

FAW

A

SA4
SA5
SA6
SA7
SA8

FAW

A

SA4
SA5
SA6
SA7
SA8

4

26

ATL TELECOM USER GUIDE

AM2048A OS/OM

4.9.3.2

Structured Operation

FIGURE 4.9.2: STRUCTURED WORKING, END-TO-END TRANSPARENT CRCS

To set up to monitor structured G.703 data, go to the “Configuration > User Port” Menu
and select
Rx Unframed

( )

Rx Framed

(*)

Rx CRC4

[ ]

Tx TSO Transparent

(*)

Tx TSO Generate

( )

Tx CRC4

[ ]

The incoming structured data may be set to monitor CRC4 errors, however, no E bits are
returned at the user interface from the transmission equipment. To do this, simply enable the
Rx CRC4 checkbox.

For fractional working where the aggregate line rate is less than 2048kbps, Rx Framed is
selected automatically. When working fractionally, not all of the timeslots are transported from
one end of the link to the other; the G.704 frame is padded out with the programmable ‘Idle’
pattern. This can be set in the “Configuration>User Port” Screen.

CRC4

NTU

ELU

TE

CRC4G

Tx

TS0

Rx

Tx

TS0

Rx

CRC4M

HDSL

CRC6

CRC4G

Tx

TS0

Rx

Tx

TS0

Rx

CRC4M

HDSL

CRC6

ET

T

V3

E

E

FAW

A

SA4
SA5
SA6
SA7
SA8

FAW

A

SA4
SA5
SA6
SA7
SA8

FAW

A

SA4
SA5
SA6
SA7
SA8

FAW

A

SA4
SA5
SA6
SA7
SA8

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Содержание AM2048A OM

Страница 1: ...AM2048A OS OM U S E R G U I D E ATL part no 1 187 500 617 Issue 02 October 2002...

Страница 2: ...ing to change the user interface plug in module The mains plug on the equipment serves as the disconnect device therefore a socket outlet shall be installed near the equipment and shall be easily acce...

Страница 3: ...nterface Port has a safety status of TNV 1 The Protective Earth on the rear panel MUST be connected see Section 4 on Installation Definitions Exposed Environment A TELECOMMUNICATIONS NETWORK is consid...

Страница 4: ...V I E W 5 3 9 F R E Q U E N T L Y A S K E D Q U E S T I O N S 4 9 8 I N T E R N A L L I N K S A N D F U S E S 4 5 4 8 2 2 G 703 to X 21 V 35 DCE 23 4 8 3 Crossing an SDH Network 23 4 8 4 Crossing a PD...

Страница 5: ...ful reference information For guidance on the use of the VT100 management port refer to the VT100 User Guide part no 1 187 500 611 For guidance on programming the e PIM Bridge Router module where fitt...

Страница 6: ...ith a different terminal interface at a later date The AM2048 can easily be configured via a VT100 dumb terminal It is recommended to use a VT100 terminal emulation program running on a notebook or pa...

Страница 7: ...10BaseT USB DSL Shelf RS 232 or 10BaseT Customer Terminal AM2048B x 12 2 10 ATL TELECOM USER GUIDE AM2048A OS OM 2 1 EXAMPLE APPLICATIONS The diagrams below illustrate some basic applications 2 1 1 De...

Страница 8: ...The membrane front panel contains 5 LED indicators and 3 push button switches with LEDs to indicate their activation LEDs Urgent Alarm Non Urgent Alarm Test Power Master Buttons Local Loop Loop Back R...

Страница 9: ...me will be extended by about 10 seconds while a backup copy of the application is made With no external connections the unit will sense the loss of external signals raise the urgent alarm and stop at...

Страница 10: ...rate in kbps for the value of N The default value of N is 32 i e 2048kbps 4 16 ATL TELECOM USER GUIDE AM2048A OS OM 4 3 DEFAULT SETTINGS The factory default is for the unit to be configured as a slave...

Страница 11: ...The default value of N is 32 Note In a G 703 to X 21 V 35 configuration if the G 703 interface is changed to structured working the maximum value of N at the X 21 V 35 interface is N 31 To change the...

Страница 12: ...35 X 21 DTE B B AM2048 Slave AM2048 Master Terminal Terminal B B G 703 G 703 V 35 X 21 V 35 X 21 DTE DCE 4 20 ATL TELECOM USER GUIDE AM2048A OS OM Using the Configuration User Port Menu 1 At the ELU s...

Страница 13: ...A G 703 Timing Master Slave SDH Network V35 X 21 DTE AM2048 Slave AM2048 Master Terminal Terminal V35 X 21 DCE G 703 G 703 B 4 22 ATL TELECOM USER GUIDE AM2048A OS OM 4 8 2 Tandem Section External Tim...

Страница 14: ...ew this is equivalent to connecting Master A directly to Master B To provide a Master clock to the system side A should be set as in section 4 9 1 3 otherwise without a master clock somewhere in the p...

Страница 15: ...A8 FAW A SA4 SA5 SA6 SA7 SA8 FAW A SA4 SA5 SA6 SA7 SA8 4 26 ATL TELECOM USER GUIDE AM2048A OS OM 4 9 3 2 Structured Operation FIGURE 4 9 2 STRUCTURED WORKING END TO END TRANSPARENT CRCS To set up to m...

Страница 16: ...TELECOM USER GUIDE AM2048A OS OM 4 9 4 ETS 300 233 Loopbacks Loop 1 and Loop 2 may be activated by sending patterns using spare bits 5 and 6 in TS0 Table 1 CrC4 Multi frame Structure Sub Multi frame...

Страница 17: ...seconds severely errored seconds and unavailable seconds for the aggregate line system The recording interval and the pass fail criterion of the datalog record are programmable by the user to match t...

Страница 18: ...mode fibre 9 125 0 25dB with an attenuation of 0 35dB km this equates to a transmission distance up to 71km For multi mode fibre 50 125 or 62 5 125 0 20dB with an attenuation of 0 6dB km this equates...

Страница 19: ...7 1 2 240V In Line PSU On this unit the mains connector is a standard 3 pin IEC 320 input Lead length 1 8m ATL part number 5 500 000 041 7 1 3 110V In line PSU On this unit the mains connector is a st...

Страница 20: ...D Non Urgent Alarm RELAY 2 COMMON RELAY 2 OPEN Non Urgent Alarm ALARM INPUT 2 ALARM INPUT 6 ALARM INPUT 5 ALARM INPUT 4 ALARM INPUT 3 36 ATL TELECOM USER GUIDE AM2048A OS OM Mating connector Molex Min...

Страница 21: ...Signal Element Timing Definition From DTE to DCE From DCE to DTE From DTE to DCE ON during Data OFF during Control From DCE to DTE ON during Data OFF during Control From DCE to DTE T and R change at...

Страница 22: ...o V 28 Circuit marked is only implemented in DTE mode The clock rate is set up using the Configuration User Port Menu Select the required value of N for Nx64K circuits DTE DCE mode may be selected usi...

Страница 23: ...or details 7 7 1 2 Setting Master Slave 1 Press the local loop and loop back buttons together and hold them until both the local loop and loop back indicators are lit Upon releasing the buttons the re...

Страница 24: ...or The fuses FS1 to FS4 are used to protect the circuit against the transverse application of mains 8 2 X 21 PLUG IN MODULE MK I The X 21 module may be configured as a DCE or DTE In both modes the rec...

Страница 25: ...2L CON4R CON4L CON6R CON6L CON8 CON10 CON11 CON12 CON9 PSU PWR Fed Wetting J1 FS400 46 ATL TELECOM USER GUIDE AM2048A OS OM 8 3 X 21 PLUG IN MODULE MK II The X 21 module may be configured as a DCE or...

Страница 26: ...peed The default bit rate for the AM2048 management serial port is 19 2kbps Go to the terminal emulator serial port configuration menu and set the serial port to 19 2kbps 8 bits no parity 1 stop bit a...

Страница 27: ...that no test loops are active The front panel TEST LED should be off on all units 2 Go to the Configuration Timeslot Map screen Check to see that the Network Timeslots nTS and the Customer Timeslots c...

Страница 28: ...crease the separation between the upstream and downstream directions Baseband transmission is used from ELU to NTU whereas the other direction is modulated onto a carrier For transmission over single...

Страница 29: ...The DSL frame length is adjusted slightly by the use of stuff bits There may be 4 stuff bits or 2 stuff bits per frame The stuff bits are used to adjust the effective payload bandwidth of the DSL fram...

Страница 30: ...with safety information 11 1 TELECOMMUNICATION STANDARDS The equipment is in conformity with the following Common Technical Regulations and National Standards Common Technical Regulations CTR2 X 21 X...

Страница 31: ...SL Digital Subscriber Line DTE Data Terminating Equipment E bit Bits in the G 704 frame used to indicate that a CRC has been received in error ELU Exchange Line Unit EMC Electromagnetic Compatibility...

Страница 32: ...Contact fibre connector features a threaded keyed design This anti rotation key prevents fiber endface damage Suitable for both multimode and singlemode cable FIFO First In First Out Buffer FLASH Non...

Страница 33: ...between bits this will cause the link to error When in DCE mode the AM2048 provides two extra clocking options to work around this problem These options are accessed from the Configuration User Port s...

Страница 34: ...TL TELECOM USER GUIDE AM2048A OS OM FIGURE A1 RECEIVE CLOCK INVERSION Clock Out Data Out DCE DTE Clock In Data In Data In Data Out Data clocked out on rising edge of the clock Data sampled on falling...

Страница 35: ...187 008 e PIM 2 187 009 1 187 009 e PIM2 2 187 010 1 187 010 Power Supplies ATL part number Order Code 240V UK Plug top 5 500 000 037 1 187 311 240V In Line IEC 5 500 000 041 1 187 312 110V In Line I...

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