Setting PDH Receive Parameters
Contents
1. Len Number of Timeslots 1 3 s N x 64k Starting Timeslot Pe Ccniiaueue T SE Patterns PRBS 2423 1 Normal Active Timeslots a gt eee Fees es ee 1 5 10 15 20 25 30 RECEIVE PAH SCION EX CAS amp l more SEET ASA OVTRATA D OVTRIFAD voice pote Figure 3 62 64k Rx SETTINGS from RECEIVE SETTINGS menu Table 3 22 64k Rx SETTINGS Choices 64k RX Settings Choices Framing Selects the framing for the underlying 2 Mb s signal Choices are 2Mb s PCM30 PCM31 PCM30CRC and PCM31CRC Configuration Selects the 64k configuration The menu choices are 1x64k Nx64k Contiguous Number of Time If the configuration is N x 64 k this selects the number of Slots contiguous channels N that make up the signal This choice will not display for a 64k configuration 3 148 CTS850 SDH PDH Test Set User M anual Setting PDH Receive Parameters Table 3 22 64k Rx SETTINGS Choices Cont 64k RX Settings Starting Timeslot Choices This selects the starting or only timeslot Test Pattern This selection is a duplicate of the Test Pattern selection choice from the RECEIVE SETTING menu Setting the Receive Rate To set the receive rate Press Menu Button RECEIVE Select Menu Highlight Page Parameter Select Choice RECEIVE Receive Rate as appropriate SETTINGS see Figure 3 63 H Select 2 Mb s 8 Mb s 34 Mb s or 140 Mb s to receive a PDH signal H If your CTS 850 te2. aa eee eae Setting PDH Receive Parameters This section describes how to manually set the receive rate receive level framing and test pattern for PDH signals Pressing AUTOSCAN sets the receive parameters automatically based on the received signal Steps for Setting Parameters The sequence of steps for setting receive parameters varies with signal to be received Figure 3 60 shows the sequence of steps required to set the receive parameters for PDH signals for example 2 M b s Set SetR eceive SetPayload and SetTest Rate 7 Level Payload Framing gt Pattern Figure 3 60 Sequence for Setting PDH Signal Parameters non demuxed Set Set Set Payload Set Test Set Rate Level and Payload Pattern Active Framing Channel Set Payload Drop to ON Figure 3 61 Sequence for Setting PDH Signal Parameters When demultiplexing a PDH Signal demuxed CTS850 SDH PDH Test Set CTS850 SDH PDH Test Set User M anual 3 147 Setting PDH Receive Parameters Selecting 64k RX Settings If the operator selects a SDH rate with PDH mapping or a PDH Transmit Rate and a 64k payload on the Receive Setting screen the 64k Rx SETTINGS menu is enabled This menu has all of the setup items required to configure a 64k or N x 64k signal along with duplicates of the framing selections and test pattern choices Tek Vleasurements Stopped Sz Mb s RECEIVE 2 Mb s 2 Mb s Framing wae PCM30 CAS CRE i Configuration N x 64k
3. ction is not displayed in scan mode Speaker In Single Display mode the operator may drop the selected timeslot to the internal speaker This field permits selection of OFF LOW MEDIUM and LOUD volumes Once enabled the speaker drop will remain on until disabled from this screen or the payload is changed for 64k Setting J itter Receive Parameters You can set the CT S850 to measure jitter or wander in PDH signals Refer to Setting J itter Receive Parameters in the separate section of this chapter on Setting J itter Wander Parameters for information about this topic CTS850 SDH PDH Test Set User M anual 3 157 Setting PDH Receive Parameters 3 158 CTS850 SDH PDH Test Set User M anual
4. d Receive Rate H Select 2 Mb s Unframed to receive an unframed 2 M b s signal H Select 2Mb s PCM 30 CAS to receive a framed 30 channel 2 Mb s signal with Channel Associated Signalling in Timeslot 16 3 152 CTS850 SDH PDH Test Set User M anual Setting PDH Receive Parameters H Select 2M b s PCM 31 to receive a framed 31 channel 2 Mb s signal H Select 2Mb s PCM 30 CRC CAS to receive a framed 30 channel 2 M b s signal with Channel Associated Signalling in Timeslot 16 with CRC4 multiframe H Select 2 Mb s PCM31 CRC to receive a framed 31 channel 2 Mb s signal with CRC4 multiframe H Select 8 Mb s Unframed to receive a unframed 34 M b s signal H Select 8 Mb s Framed to receive a framed 34 M b s signal H Select 34 Mb s Unframed to receive an unframed 34 M b s signal H Select 34 Mb s Framed to receive a framed 34 M b s signal H Select 140 M b s Unframed to receive an unframed 140 M b s signal H Select 140 M b s Framed to receive a framed 140 M b s signal H Select 64k PCM 30 CAS CRC 64k PCM 31 CRC 64k PCM 30 CAS or 64k PCM 31 Specifying the Test Pattern To specify the test pattern of the received signal Press Menu Select Menu Highlight Button Page Parameter Select Choice RECEIVE RECEIVE Test Pattern as appropriate SETTINGS NOTE The choices available for Test Pattern depend on the selected Receive Rate CTS850 SDH PDH Test Set User M anual 3 153 Setting PDH Receive Parame
5. he operator to drop a certain PDH payload 8 Mb s and 64k rates can not be dropped CTS850 SDH PDH Test Set User M anual 3 155 Setting PDH Receive Parameters Selecting RX CAS amp Voice RX CAS runs in scan mode where it updates all values as frequently as possible or single channel mode which permits the operator to select a channel and have it dropped to the speaker These selections are mutually exclusive because the same CAS channel selector is used for picking the timeslot for reading CAS bits and dropping to the speaker This screen is only accessible when the receive payload is 64k If CAS is disabled it only permits timeslot selection and speaker control CAS is only available if the 2 M b s framing is PCM 30 or PCM 30 CRC Tek Veasurements Stopped G 2Mb RECEIVE 2Mb CAS Display Mode i Selected Timeslot 1 single SPO AK A E E E off TS abcd Scan CAS Bit ValU S ccceseseeen 1 0000 RECEIVE sak RS APTT was cPTTINGS PALH SICON OVIRATSD OVTRIFAD Figure 3 64 RX CAS amp Voice from Receive Setting Menu 3 156 CTS850 SDH PDH Test Set U ser M anual Setting PDH Receive Parameters Table 3 23 RX CAS amp Voice Choices Rx CAS amp Voice Choices CAS Display Mode The operator can select SINGLE mode which selects a Single timeslot and enables the speaker drop Selected Timeslot In Single display mode this permits selection of the timeslot of interest This sele
6. ighlight Button Page Parameter Select Choice RECEIVE RECEIVE Tx Rx Setup Coupled SETTINGS NOTE When settings are coupled from the RECEIVE SETTINGS page the transmit parameters are changed to match the receive parameters Conversely when settings are coupled from the TRANSMIT SETTINGS page the receive parameters are changed to match the transmit parameters To change receive and transmit settings so that they are no longer coupled Press Menu Select Menu Highlight Button Page Parameter Select Choice RECEIVE RECEIVE TX Rx Setup Independent SETTINGS Notice that the signal status icons in the upper right corner of the display changed to indicate that the settings are no longer coupled CTS850 SDH PDH Test Set User M anual 3 151 Setting PDH Receive Parameters Setting the Receive Level For PDH Receive Paremeters specify the receive level for electrical signals Press Menu Select Menu Highlight Button Page Parameter Select Choice RECEIVE RECEIVE Receive Level Normal SETTINGS Monitor 20db Monitor 30db Setting Payload and Payload Framing When receiving a PDH signal you can specify payload and payload framing of the signal To specify the framing of a received PDH signal Press Menu Select Menu Highlight Button Page Parameter Select Choice RECEIVE RECEIVE Payload and as appropriate SETTINGS Payload Framing NOTE The choices available for Framing depend on the selecte
7. st set supports the 45 M b s option there is also a 45 Mb s signal available for selection CTS850 SDH PDH Test Set User M anual 3 149 Setting PDH Receive Parameters Available PDH receive rates Tek Veasurements Stopped 2 Mb s HDB3 Unbal Normal Cross Connect Receive Rate 140 Mb s Receive Level 34 Mb s Payload Structure sss 2 Mb s Unframed Test Patlertt nsss PRBS 2423 1 Normal 8 Mb s QM bY more TARR SetU saaa Independent 2 of 2 sak be SIGNAL ANALYSIS IIITER are SETTINCS STATUS CONFIG WANDFS Lot Figure 3 63 PDH Signal Receive Rates Independent Receive and Transmit Settings Generally you can set the receive and transmit settings independent ly For example you can receive an electrical signal at the 34 Mb s rate while simultaneously transmitting an optical signal at the STM 1 rate Coupling Receive and Transmit Settings If your application requires that the receive settings and transmit settings be identical you can save time by coupling them together After they are coupled any change you make to a parameter on the RECEIVE SETTINGS page will also be made to the corresponding setting in the TRANSMIT SETTINGS page of the RECEIVE menu The inverse is also true 3 150 CTS850 SDH PDH Test Set User M anual Setting PDH Receive Parameters To couple the receive and transmit settings together from the RECEIVE SETTINGS page Press Menu Select Menu H
8. ters 3 154 H Select 1 in 8 to set the test pattern to 1000 0000 H Select User Word 8 bit User Word 16 bit or User Word 24 bit to set a test pattern different from the preset choices If you choose User Word the test pattern description changes to User Defined B yte H Select Unknown when you do not know what test pattern is being transmitted or when the test pattern is not stable If you select User Word for the test pattern set the value of the User Word as follows 1 Select the line containing the byte to set the value of the User Defined B yte 2 Define the contents of the User Defined B yte as follows Press Menu Select Menu Highlight Button Page Parameter Select Choice select displayed Set to 00000000 byte Set to 11111111 Default 10101010 EDIT BYTE H Select Set to 00000000 to set the test pattern to all zeros H Select Set to 11111111 to set the test pattern to all ones H Select Default 10101010 to set the test pattern to alternating ones and zeros 3 Select EDIT BYTE to specify a value different from the preset choices 4 Select DONE when you are finished editing the byte CTS850 SDH PDH Test Set User M anual Setting PDH Receive Parameters Specifying the Payload Drop If the Receive rate is any PDH or SDH rate SDH is mapped for PDH and the PDH payload is less than the line rate then a selection appears at the bottom of Receive Receive Settings menu This selection permits t
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