Modem E1
Contents
1. Clock Source Selection Single Clock Source For E1 channel the single clock source is used as a rule The source of clock signal may be an internal oscillator of any El modem or external clock signal of any DTE Examples are shown in figures be low Single clock source from DTE A Separate Clock Source Receive and transmit lines of E1 channel are fully independent and they can have separate clock sources Example of the mode is shown in figure on the next page Separate clock source from modems A and B X 21 interface X 21 interface has ITU T V 11 compliant specifications Set of signals is different from other interfaces X 21 DB 15 Signal 2 Transmit A 9 Transmit B 4 Receive A 11 Receive B 14 6 Sig Timing 13 Sig Timing B 3 Control A 10 Control B 5 Indication A 12 Indication B 1 Shield 8 GND X 21 interface uses the single clock signal for received and tra2. Unframed Mode Selection 1 1 S1 5 initial timeslot of E1 frame timeslot 1 one not zero 53 8 switch controls unframed mode se 79000 timesiot 1 lection In this mode E1 L modem is com 79990 timesot2 patible with Cronyx PCM2 HUUB timesiot3 53 8 Unframed mode tmeslot4 p m HHAH timeslot 5 06009006 timeslots isot timesiot7 096006 tmeslota CTS Signal Control HAHA timeslots 00006 _ timeslot 10 CTS signal control mode is selected by S3 JB BB 11 4 and S3 5 switches HEA timeslot 12 B B A timeslot 13 53 4 53 5 CTS mode d p p p timeslot 14 H H CTS 1 timeslot15 B CTS CD B timeslot 16 B CTS RTS 20060 timeslot 17 BBgBHEB timeslot 19 96906 _ timeslot 20 Input Signal Gain 260900 timeslot21 96009006 timeslot22 E1 channel receiver sensitivity can be set BBBBB timeslot23 to 12 dB or 30 dB level The S3 10 switch BB timesiot24 selects receiver sensitivity AAHUA timesict25 53 10 receiver sensitivity i i 2 i 2 timeslot 27 d eU
3. 4 123060 Moscow Russia Marshala Sokolovskogo St 4 Phone Fax 7 095 742 1771 Web www cronyx ru FTP ftp cronyx ru E mail info cronyx ru
4. BPV bipolar coding violations on the line OOS frame syncronization failed number of seconds Slip slip occured number of seconds Err external clock is failed or BER tester errors occured number of seconds Modem transfers values of local error counters to remote unit and receives val ues of remote error counters via control channel 1 channel state is identified by set of flags Flag Channel state Ok Normal operation LOS Loss of line signal AIS Alarm indicator signal blue code LOF Loss of frame LOMF Loss of multiframe FARLOF Loss of frame on remote modem AIS16 Timeslot 16 alarm indicator signal FARLOMF Loss of multiframe on remote modem CRCE Checksum error RCRCE Checksum error on remote modem Loopback menu controls local digital and remote loopbacks Copyright 1998 2000 Cronyx Engineering Loopback 1 Main link local loop disabled 2 Main link remote loop disabled 3 Digital port disabled Command _ BER tester and loop management is avail able only if switches LOOP and BERT on front panel are OFF BER tester and loop parameters settings are not stored in NVRAM Main link menu provides E1 line param eters setting Main link Framing El Transmit clock Etc Timeslots Timeslot 16 Use Crc4 No Receiver gain Low Command User can select timeslots for data transmis sion by moving cursor to corresponding
5. 13 CTS b 8 CD a CD 10 CD b 1 7 GND GND ALARM Copyright 1998 2000 Cronyx Engineering E1 L SE Se a Se eee VAL Model X21 has DB15 female connector for X 21 interface DB 15female X Signal Direction 2 T A 9 4 R A 11 R B 7 14 ETC B Bxon 6 S A 13 S B 3 10 C B 5 12 I B 1 8 GND GND Model M has HDB44 female connector for multistandard interface Cont V 35 RS 530 RS 232 21 10 TXD a TXD a TXD Transmit A 25 TXD b TXD b Transmit B 8 RXD a RXD a RXD Receive A 9 RXD b RXD b Receive B 6 ETC a ETC a ETC ETC A 7 ETC b ETC b ETC B 2 TXC a TXC a TXC SigTiming A 3 TXC b TXC b SigTiming B 5 RXC a RXC a RXC 4 RXC b RXC b 17 ERC a ERC a ERC 18 ERC b ERC b 14 RTS RTS a RTS Control A 29 RTS b Control B 11 DTR DTR a 26 DTR b 13 DSR DSR a DSR 28 DSR b 15 CTS CTS a CTS 30 CTS b 12 CD CD a CD Indication A 27 CD bb Indication B 116 GND GND GND GND 31 SEL 0 SEL 0 SEL 0 SEL 0 33 SEL 1 SEL 1
6. timesiot28 BBBUB timesiot29 AAPG timeslot30 Initial Timeslot ABABA timeslot 31 1 1 1 5 switches select the numberof Number of Timeslots initial timeslot of E1 frame They do not affect the modem operation in unframed mode 51 6 81 10 switches select the number of timeslots used for data transmission Data transfer rate depends on the number of timeslots selected and is equal N x 64 Copyright 1998 2000 Cronyx Engineering E1 L SS eS x eI ee oS eS ee ILU ee kbps In unframed mode the switches se lect only fixed data transfer rates 2048 1024 512 128 64 kbps marked with in table 51 6 51 10 number of TS data rate dB 0 timeslots 0 kbps 1 timeslot 64 kbps 2 timeslots 128 kbps 3 timeslots 192 kbps 4 timeslots 256 kbps 5 timeslots 320 kbps 6 timeslots 384 kbps 7 timeslots 448 kbps 8 timeslots 512 kbps 9 timeslots 576 kbps 10 timeslots 640 kbps 11 timeslots 704 kbps 12 timeslots 768 kbps 13 timeslots 832 kbps 14 timeslots 896 kbps 15 timeslots 960 kbps 16 timeslots 1024 kbps 17 timeslots 1088 kbps 18 timeslots 1152 kbps 19 timeslots 1216 kbps 20 timeslots 1280 kbps 21 timeslots 1344 kbps 22 timeslots 1408 kbps 23 timeslots 1472 kbps 24
7. Copyright 1998 2000 Cronyx Engineering N x 64 kbps or up to 2048 kbps in unframed mode TXC RXC ETC ERC DTR DSR CTS RTS CD HDB3 120 Ohm Balanced Twisted Pair or 75 Ohm Unbalanced Coax Cable from 0 to 30 dB up to 1 5 km of 22 AWG 0 6 mm twisted pair INT Internal Oscillator RCV Receiver EXT Digital Interface Both in receive amp transmit path 120 UIpp attenuation G 704 or unframed mode CRCA CAS G 704 Controlled Slip Buffer Terminal Block up to 250mA up to 175V DC RS 232 Async 19200 bps 8 bit char 1 stop bit no parity DB9 Digital local G 703 line on local unit remote G 703 line on remote unit selected by front panel switches or via control port Activated by front panel switch or via control port e E1 L Ordering Code Controls and Indicators E1 L B M AC Power supply Controls on front panel AC 220V DC 60V for stand alone BERT bit error rate tester switch unit only Digital interface BERT BER tester switch M multistandard ON E1 line testing V35 V 35 OFF normal operation 232 RS 232 530 RS 530 ETH Ethernet LOOP two loopback mode switches Construction Loopback LOOP1 LOOP2 B stand alone unit 1 R Rack mount card Disable OFF Any Model Local loop on link E1 ON LOC E1 L modem E1 Remote loop on link E1 REM Digital
8. OJJ AJ 5v External input sensor user s device Alarm connector scheme Alarm state is shown 11 12 E1 L pur It cro eC e UI Eg ID e IO ee DI P ELIO eR UI c T IO e UU UI IG EU UE UII cem UU TID TI e ILI ee CALLA hhh Rear Panel Connectors There are digital interface connector and line terminal block on the rear panel see figures Modems with V 35 interface model V have standard M 34 female connector Contact Signal Direction P TD a Input S TD b Input R RD a Ouput T RD b Ouput U ET a Input W ET b Input Y TC a Ouput AA TC b Ouput BB ERC a Input Z ERC b Input V RC a Ouput X RC b Ouput C RTS Input H DTR Input E DSR Ouput D CTS Ouput F DCD Ouput A CGND B SGND Models 232 and 530 have DB25 female connector for RS 232 and RS 530 inter faces Contact DB25 RS 530 RS 232 Direction 2 TXD a TXD 14 TXD b 3 RXD a RXD 16 RXD bb 24 11 ETC b Bxon 15 TXC a TXC 12 TXC b 17 RXC a RXC 9 RXC b 21 ERC a 18 ERC b 4 RTS a RTS 19 RTS b 20 DTR a DTR 23 DTR b 6 DSR a DSR 22 DSR b 5 CTS a CTS
9. 51 E configuration amp synchronization E1 frame timeslots Bottom cover view Stand alone unit E1 frame timeslots Sn Modem configuration amp 53 synchronization Component side view Rack mount card The following designations are used for DIP switch state indication OFF B Copyright 1998 2000 Cronyx Engineering E1 L Bur ct cro eC e ee eS I E SI DP OCIO RESI ED OLIO UM NU OH E C e ID ce Um ee CLL issih Configuration Saving S3 9 switch enables remote control of modem parameters are set by terminal connected to control port or by network via SNMP protocol rack mount unit In remote control mode parameters are stored in NVRAM If remote control is disabled NVRAM is not used and param eters are set only by DIP switches 53 9 Parameters setting By switches only remote control is disabled NVRAM is not used B By terminal parameters are saved in NVRAM DIP switches are not used Synchronization 53 1 S3 2 switches set channel syn chronization mode S3 1 53 2 E1 channel synchronization INT internal oscillator A RCV from receiver B DTE1 emulation ETC B B DTE2 emulation ETC ERC Transmit Clock Inversion When INT or RCV synchronization mode is used data signal TXD is delayed in rela tion to TXC clock Summary delay is formed by cable delay and digital interfac es delay of m
10. SEL 1 SEL 1 35 SEL 2 SEL 2 SEL 2 SEL 2 37 SEL 3 SEL 3 SEL 3 SEL 3 39 SEL 4 SEL 4 SEL 4 SEL 4 41 SEL 5 SEL 5 SEL 5 SEL 5 43 SEL 6 SEL 6 SEL 6 SEL 6 32 DCE DCE DCE DCE contact should be shorted to GND Console Modem front panel has DB9 connector for control terminal console with RS232 in terface Console can be used for monitor ing of modem current state channels state statistics of local and remote errors If re mote management is enabled S3 9 switch user can set device mode through management console and store parameters in Some parameters can be set only from management console CRC4 framing arbitrary timeslots selection input alarm sensor mode e inversion compatibility mode Console connector has standard DTE wir ing Copyright 1998 2000 Cronyx Engineering e E1 L Se I GU EU A OO UAI P OLIO eR UI eR UII IG UC c es a a a ee issih Contact RS 232 Direction TXD Output RXD Input RTS Output DTR Output CTS Input Console of modem E1 L 5 o o o o 12 13 OJ hN CO 83 TE AA CD Input Cable with modem control signals GND Console user interface is implemented as a hierarchical menu Main menu is shown in figure To select a command user should enter its numbe
11. connect to GND 1 RS 449 cable wiring for M models RS 530 cable wiring for M models signa HDB44 male 0837 female Signa HDB44 male DB25 emae 10 m Dia 0 ws 29 20 gt 2 t 22 TXD b 25 lt _ 14 RXD a 8 6 RXD a 8 p 3 RXD b 9 j 24 RXD b 9 p 16 ETC a 6 17 ETC a 6 ua 24 ETC b 7 ES 35 ETC b 7 PN 11 TXCa 2 E 5 2 15 TXC b 3 23 TCS 3 E 12 RXC a 5 lt 8 RXC a 5 17 RXC b 4 p 26 RXC b 4 j 9 ERC a 17 4 3 ERC b 18 4 2 21 Copyright 1998 2000 Cronyx Engineering E1 L L e eo o I t ne eS ee eee Bg yy P P P tut RTS a 14 7 TXC b 3 Not connected RTS b 29 25 ERC a 17 Not connected DTR a 11 12 ERC b 18 Not connected DTR b 26 lt 30 GND 1 gt 1 GND DSR a 13 11 GND 16 gt 16 GND DSR b 28 29 SEL x 31 39 41 43 32 CTS a 15 9 connect to GND 1 on every connector CTS b 30 27 BC NEN 15 X 21 cable wiring for M models CD b 27 31 Signal 44 male DB15 female GND 1 gt 1 TXD a 10 4 2 GND 16 gt 19 TXD b 25 4 9 SEL x 31 33 37 RXD a 8 4 connect to GND 1 RXD b 9 gt 11 6 4 7 Cable wiring for two devices connection M mod
12. position and pressing Spacebar Symbol marks selected timeslots 15 e GUNN E1 L Bur ee ee IU e IO I D eR AUTO UT D eR CO UT I EU UR I ILU II ORE RE CO eU Cables Wiring RXD a 8 TXDa RXD b 9 S TXD b V 35 DCE cable wiring for V ETC a 6 lt V RXCa models with external transmit ETC b 7 P X RXC b clock DTE1 emulation mode RXC a 5 U ETC a E1 L M34 male DCE M34 male RXC b 4 W ETC b TXD a P 4 RXD a RTS 14 TXD b S 4 T RXD b DTR 11 lt E DSR RXD a P TXD a DSR 13 H DTR RXDb T S TXD b CD 12 C RTS ETC a U V RXC a TXCa 2 Not connected ETC b W lt X RXC b TXC b 3 Not connected RXC a V 0 ERC a 17 Not connected RXC b X W ETC b ERC b 18 Not connected TXC a Y Not connected GND 1 lt gt A GND TXC b AA Not connected GND 16 gt B GND ERC a BB Not connected SEL x 31 39 41 43 32 ERC b Z Not connected connect to GND 1 RTS CD DTR V 35 DCE cable wiring for V models with external receive and DSR H DTR transmit clocks DTE2 emulation CD F RTS mode GND A gt A GND E1 L M34 male DCEM34 male OD 4 9 V 35 DCE cable wiring for M TXDb 8 xc UT PADD models with external transmit RX
13. timeslots 1536 kbps 25 timeslots 1600 kbps 26 timeslots 1664 kbps 27 timeslots 1728 kbps 28 timeslots 1792 kbps 29 timeslots 1856 kbps 30 timeslots 1920 kbps 31 timeslots 1984 kbps 2048 kbps unframed mode x B 60 08 08 08 768 0 0 EE ee e E E 3 ES LES LI es e EE ET BWW E687 C8 E WWW DW eS WD E E 3 Eee e LE E Dg ge 08 180 038 08 60 08 60 o ELT C83 Er O3 EE ES EE 0 0 E 1 EJ LO EE Ce EE oe c 5 e Ce pag oS Pag pag WOOO OOo oo wo Jumpers Jumpers location is shown in figure be low To set jumpers on a stand alone de vice the top cover should be open The top cover is fixed with four screws pro tected by caps Line Impedance E1 line impedance is set by three jumpers Jumpers should be set for coaxial cable 75 Ohm and should be removed for twist ed pair Modem is supplied in configura tion for twisted pair line 120 Ohm E1 line impedance jumpers Stand alone unit E1 line impedance jumpers Rack mount card Copyright 1998 2000 Cronyx Engineering E1 L ee eS ee
14. with external receive and di EE T transmit clocks DTE2 emulation ETC a 6 U mode ETC b 7 Signal HDB44 male M34 male Pua d NL M TXD a 10 R RXD a ee gt n TXD b 25 T RXD b gt M RXD a 8 Lo P TXD a 2 RXD b 9 S TXD b Eee 1 7 6 _ V RXCa 2 ETC b 7 PNE X RXC b wie 29 t p RXC a 5 Not connected DIR MH NET amp RXC b 4 Not connected ook ls LII s RTS 14 _ CD ere 6 gt DTR 11 4 E DSR Po i r T DSR 413 gt H DTR GND 4 mm CD 12 C RTS e E TXC a 2 Not connected 36598 TXC b 3 Not connected gonnectto ND Copyright 1998 2000 Cronyx Engineering 17 e E1 L Bur cU t UU toT eC e ee eS e ED AOT UU T D eR COO UT I ILU II ORE RE CO CLL issih RS 232 cable wiring for M models 17 P ji Signal HDB44 male DB25 femaley 18 I 18 TXD 10 2 RTS a 14 4 8 3 RTS b 29 Tu 19 6 4 24 DTR a 11 4 20 TXC 2 y 15 DTR b 26 a 23 RXC 5 p 17 DSR a 13 p 6 ERC 17 4 24 DSR b 28 j 22 RTS 14 4 4 CTS a 15 5 DTR 11 a 20 CTS b 30 L 13 DSR 13 ANM 6 CD a 12 8 CTS 15 uS 5 CD b 27 LE 10 CD 12 8 8 GND 1 gt 1 GND 1 4 1 GND 16 PEES 7 GND 416 pu 7 SEL x 31 33 37 SELx 31 35 37 connect to GND 1
15. D a R i P TXD a clock DTE1 emulation mode RXDb T 4 S TXD b Signal HDB44 male M34 male U V RXC a TXD a 10 R W X RXC b TXD b 21 4 T RXD b RXC a V Not connected Copyright 1998 2000 Cronyx Engineering Mopem Converter E1 L ee I UR UNI I On e T UN D I On Ue UT I muU I rec em a nn eee RXC b X Not connected ERC a 17 Y TXC a TXC a Y Not connected ERC b 18 AA TXC b TXC b AA Not connected GND 1 gt A GND ERC a BB 4 Y TXC a GND 16 gt B GND ERC b Z AA TXC b SEL x 31 39 41 43 32 RTS 4 F CD connect to GND 1 DTR H i E DSR E DTE V 35 cable wiring for M models CD F C RTS Signal HDB44 male M34 female GND A GND 10 GND B lt gt B GND TXD b 25 4 S RXD a 8 R V 35 DCE cable wiring for M models
16. Modem converter E1 L CLA 39 Ineerin g User s Guide Features E1G703 G704 channel Distance up to 1 5 km V 35 RS 530 RS 449 RS 232 X 21 Ethernet user data interface Data rate from 64 kbps up to 2048 kbps Programmable timeslot assignment G 703 2048 kbps unframed mode Cronyx PCM2 compatibility CAS and CRCA framing Synchronization from digital inter face DTE emulation Digital local and remote loopbacks Integrated BER tester RS 232 Control port Dry contacts alarm interface Stand alone or rack mount 19 3U AC or DC power The certificate No 1 19 of the Russian Ministry of Communications registration number POCC RU 0001 019C00 Copyright 1998 2000 Cronyx Engineering Contents Description Package Contents Specifications Ordering Code Controls and Indicators Controls on Front Panel Front Panel Indicators DIP Switches Jumpers Line Impedance Transmit Clock Inversion Clock Source Selection Single clock source Separate clock sources Loop Selection Normal Operation Local Loopback Remote Loopback Digital Loopback Alarm Interface Rear Panel Connectors Console Cables Wiring 1 1 0E 01 12 2000 2 Mopem Converter E1 L IU e IO ee DI UP OLIO eR UI c OLIO e UU UI I e RU UE UI ILI ee Description Cronyx E1 L is a multipurpose access unit for Fractional El serv
17. els Me T iu 2 gt 6 Signal HDB44 male HDB44 male Signal TXC b 3 mm 43 TXD a 10 lt 8 RXD a RTS a 44 3 TXD b 25 4 9 RXD b RTS b 29 4 10 RXD a 8 10 TXD a CD a 42 MN 5 RXD b 9 25 TXD b CD b 27 MEE 42 ETC a 6 5 RXC a GND 4 gt 1 ETC b 7 lt 4 RXC b GND 16 PEN 8 RXC a 5 6 ETC a SEL x 33 237 RXC b 4 7 ETCb connect to GND 16 RTS 14 4 12 CD DTR 11 4 13 DSR DSR 13 11 DTR CD 12 14 RTS 2 Not connected Copyright 1998 2000 Cronyx Engineering 19 E1 L w sr m s m H Hm m m s LLL hhh 3AO KB Cronyx Engineering DIP switches ON 399899988 ON Use16 Scr ITXC Unframed Higain initial timeslot TSO aiibi number of timeslots data transfer rate in unframed mode SYNC E1 channel synchronization mode Usel 6 Scr use of timeslot 16 data scrambling in unframed mode CUS CTS signal mode ITXC secretes transmit clock inversion IRXC receive clock inversion Unframed unframed mode Smart parameters setting through terminal Higa high input gain 123060
18. ices As a rate and interface converter it accepts digital inter face data at any multiple rate of 64 kbps up to 2048 kbps and places it into E1 frame using required number of timeslots or the whole bandwidth of 2048 kbps in un framed mode As a modem it is capable to operate at dis tances up to 1 5 km over twisted pair or coaxial cable E1 L device is available as stand alone unit or as a for 19 3U Cronyx rack Rack mount modem consists of two cards one of which is set on the front side and the other on the back side of the rack V 35 Digital E4 Channel E1 Ethernet Interface Interface up to etc 1 5 km To terminal RS 232 Control port It can be ordered with RS 530 RS 232 V 35 or X 21 interfaces ended with stan dard connectors Multi standard interface option with HDB44 connector is also avail able The type of interface in this case is determined by adapter cable RS 232 RS 530 RS 449 RS 442 V 35 or X 21 V 35 RS 530 RS 232 64 2048 Device can be ordered with Ethernet inter face A couple of devices with this inter face form a remote bridge for two LANs Configuration can be performed via RS 232 control port or by DIP switches Con figuration parameters are stored in NVRAM Maintenance capabilities include user acti vated local and remote loopbacks on the link In band management of the re mote unit can be performed by using the spare bits Sa on times
19. loop ON DIG Front panel indicators Indicator Description PWR Power supply RTS Digital interface signal Ready to Send RERR Remote unit errors LERR Local unit errors TST Test modes PWR RTS RERR LERR TST BERT r LOOP4A CONTROL RS 232 ON LOC ON 9 O O O REM OFF Copyright 1998 2000 Cronyx Engineering E1 L Se a eS e pct e eg e D t ne ev e pc e eee WALL TST indicator State Description Off Normal operation Lights BER tester is ON Continuous Blinks Local loop is ON Single blinks Remote loop is ON Double blinks Digital loop is ON LERR indicator lights if there is no signal on E1 line if external clock frequency doesn t correspond with the selected data transfer rate 1f synchronization is lost in framed operation mode If BER test mode is won indicator lights if there are OFF 1 ON errors in E1 line RERR indicator lights if syn chronization is lost on remote unit bit A of timeslot 0 RERR indicator is not used in unframed operation mode PWR RTS 2 pes E s OFF ON DIP switches DIP switches are placed on bottom cover of stand alone unit and on component side of card in rack mount unit 81 group frame timeslots or data transfer rate on digital port in unframed operation mode 53 group Modem configuration amp syn chronization SS
20. lot 0 in compli ance with G 704 recommendation Modem E1 L is also available as a card for Intel compatible computers Cronyx Tau Tau PCI E1 Package Contents The following is a check list for the con tents of your package e Modem E1 L in ordered configuration Removable terminal block for E1 line Power supply cord for AC power models User manual Router E1 L kbps E1 L Copyright 1998 2000 Cronyx Engineering E1 L a e e OI t n e SS ee VAL Specifications Digital Interface Data Transfer Rate Clock Options rentes ModemControl Signals E1 Interface Pine Ling Input Signal Attenuation Range Transmit Timing Sources Jitter Attenuator eese Frame structure is cessat a seht Multiframes Frequencies offset Adjustment Connector Ty Pe Alarm Interface Relay Contact Relay Contact Voltage Control Port nterface Loisir estem E pee E UI oor et ted ch Protocol Connector Type Diagnostics BER 2
21. nsmitted data For cor rect data receiving it is necessary to pro vide single clock source in channel Two connected modems must have settings pro viding use ofthe same oscillator as a clock source 1 Int RCV or EXT RCV Indi cation signal corresponds to CD signal and Control signal to RTS signal Copyright 1998 2000 Cronyx Engineering 10 e E1 L Bur ct Uc UTC e UI Eg IU e IO ee DI UP ELIO eR UI CU OLIO e UU UI I e Ue E C I UU DET TIU ILU eee CLL issih Loop Selection Remote Loopback LOOPI switch is ON LOOP2 switch is Normal Operation REM Remote modem turns on off local loopback by local modem request LOOPI switch is OFF Local Remote Local Remote modem modem modem modem normal normal operation operation remote local loopback loopback Local Loopback LOOPI switch is ON LOOP2 switch is Digital Loopback EON LOOPI switch is ON LOOP2 switch is DIG Remote modem normal operation Local modem local loopback Local Remote modem modem digital normal loopback operation Copyright 1998 2000 Cronyx Engineering Mopem ConverterR E1 L Se es eS OU ee VAL Alarm Interface The modem is equipped with alarm inter face It provides turning on external alarm device i e ring buzzer indicator if some failure occurs carrier loss clock loss pow er failure Alarm device is turned on by dr
22. odem and connected device As aresult of this delay errors can occur at some data rates The problem can be solved by inverting the transmit clock signal us ing S3 6 switch 53 6 TXC inversion no TXC inversion B TXC inversion Receive Clock Inversion When DTE2 emulation is used the RXD signal is delayed in relation to ERC clock Summary delay is formed by cable delay and digital interfaces delay of modem and connected device As a result of this delay errors can occur at some data rates The problem can be solved by ERC inversion via S3 7 switch When DTE2 emulation is not used the S3 7 switch controls RXC inversion in rela tion to received data RXD S3 7 RXC or ERC inversion no RXC or ERC inversion B RXC or ERC inversion Use of Timeslot 16 Scrambler 53 3 switch controls use of El frame timeslot 16 in framed mode In unframed mode 53 3 switch controls data scrambling S3 3 Framed mode Unframed mode Timeslot 16 Scrambler reserved for signaling disabled B enabled for data enabled Copyright 1998 2000 Cronyx Engineering E1 L aa Rc e ng Ue occ CR CIO OU P I e C CR II OP UU D c Nu rrr ree
23. r It is necessary to provide signals CD and CTS for console operation It is recom mended to use following null modem ca User can set operation mode through menu ble wiring Configure DIP switch S3 9 should be set in ON position _ GND GND ou TXD TXD Configure RXD RXD g 9 eo RTS RTS Main link 5 CTS CTS 5 2 Serial port E DTR DTR 26 Auto remote loopback Enabled 5 Save parameters CD te DSR Restore parameters CD Command Cable without modem control signals Cronyx E1 Revision B 09 01 99 Jumpers Tsync Rcv Rsync Ext 0 0 16 Using jumpers settings Mode Dumb Main link TP Tsync Rcv Rsync Ext Low gain Port 1024 kbps V 35 no DTR no RTS no ETC no ERC TXC no RXC CTS 1 1357913579135 791 Timeslots 0 Timeslots 1 Configure Statistics Loopback Link test stopped Reset Command _ Copyright 1998 2000 Cronyx Engineering E1 L ee oe ee fog c eC IO c ee I OUR IO eS Lye E VAL Parameter settings can be saved in NVRAM by command Save parameters Previous parameters can be restored from NVRAM by command Restore parameters To monitor current settings channel modes error counters command Statis tics should be used Counter Error description
24. y contacts of relay For rack mount models the alarm interface is optional The alarm interface has also the input con tacts Their state connected disconnected is transmitted to remote unit and turns on a relay If modem is installed in unattend ed room the alarm input contacts may be used for example for remote climatic sen sors door lock sensors etc Alarm input contacts work in framed mode only Warning Input alarm contacts must be isolated from other electrical circuits If this requirement is not carried out modem may be damaged If power supply is ON and carrier is present contact 3 is connected to contact 1 If power is OFF or carrier is lost contact 3 is dis connected from contact 1 and connected to contact 2 alarm state External input contacts have two modes normal connected and normal disconnect ed By default normal disconnected mode is set If contact 4 is connected to contact 5 remote unit is set to alarm state Normal connected mode can be set through console In this case input contacts should be connected by sensor If input contacts are disconnected remote unit is set to alarm state Copyright 1998 2000 Cronyx Engineering Contact Description 1 Shorted to common contact 3 on operating condition Disconnected when error occurs 2 Disconnected on operating condition Shorted to common contact 3 when error occurs Common contact GND Input contact GND
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