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Raisecom RC3000 PCM User Manual

Manual is about: Multi-Service Multiplexer

Summary of RC3000 PCM

  • Page 1

    Raisecom technology co., ltd rc3000 pcm multi-service multiplexer user manual raisecom technology co., ltd （9/2005）.

  • Page 2: 1. Cautions

    Raisecom technology co., ltd 1 1. Cautions please read the following notices carefully before installing and using this device, raisecom does not respond to any loss caused by violating safety notices. Rc3000 is integrated device that has precise elements, please avoid violent shakes and impacts, an...

  • Page 3: Contents

    Raisecom technology co., ltd 2 contents 1. Cautions ............................................................................................................. 1 2. Overview............................................................................................................. 7 2.1. Introduc...

  • Page 4

    Raisecom technology co., ltd 3 6.2. Front panel explanation:......................................................................... 24 6.2.1. Globle indicator lights:................................................................... 24 6.2.2. Indicator lights of line-board: .........................

  • Page 5

    Raisecom technology co., ltd 4 8.3. Installation .............................................................................................. 47 8.3.1. Device fixing:................................................................................. 47 8.3.2. Cabble connection .........................

  • Page 6

    Raisecom technology co., ltd 5 10.9.3. Line-board set............................................................................. 64 10.9.4. E1 set.......................................................................................... 65 10.9.5. E1 clock set ........................................

  • Page 7

    Raisecom technology co., ltd 6 10.16.2. Create group cross .................................................................. 79 10.16.3. Delete group cross .................................................................. 80 10.17. Operate menu.........................................................

  • Page 8: 2. Overview

    Raisecom technology co., ltd 7 2. Overview 2.1. Introduction rc3000 is a pcm multi-service multiplexer that uses both traditional and modern technologies, and can provide a high reliable access at a low cost along with multi functions, easy application and maintenance. 2.2. Main features: z multiple...

  • Page 9

    Raisecom technology co., ltd 8 z strong network management function: both assistant network management channel and network management cascade are available to manage whole network of rc3000 devices..

  • Page 10: 3. Application Examples:

    Raisecom technology co., ltd 9 3. Application examples: 3.1. Traditional pcm application the default factory status of rc3000 is without any configuration. All user-boards support automatic recognition and voice channel allocation. In figure 1, the same extension slots in the two devices use the sam...

  • Page 11

    Raisecom technology co., ltd 10 rc3000-2e1 (adm) will connect the same channels (unused) of 1e1 and 2e1 automatically. That is to say, when there is no user-board all the channels in 1e1 will be cross connected with those of 2e1; in this case the device has adm function. The relationship of the two ...

  • Page 12

    Raisecom technology co., ltd 11 in this application, voice channels in local device can be alloted to remote rc3000s, and voice channels of remote rc3000s can be cross connected too. So multi services access can be realized. 3.4. Point-to-multipoint star topology application point-to-multipoint aces...

  • Page 13

    Raisecom technology co., ltd 12 4. Device type and user-board explanation 4.1. Device type explanation: explanation of device type: rc3000-xxx-xx-xx ac there are 4 types of line-boards of rc3000: rc3000-opt-2e1 rc3000 line-board of optical interface rc3000-opt-fe rc3000 line-board of optical interfa...

  • Page 14

    Raisecom technology co., ltd 13 rc3000-opt-s1fc single-mode dual-fiber 1310,dfc, 0~25km rc3000-opt-m single-mode dual-fiber 1310,dsc, 0~2km rc3000-opt-as1 single-mode dual-fiber 1310,dsc, with als function, 0~25km rc3000-opt-as2 single-mode dual-fiber 1310,dsc, with als function, 10~50km note: devic...

  • Page 15

    Raisecom technology co., ltd 14 rc3000-sub-d422 rs422 serial data user-board 8 channels, unconfigurable rc3000-sub-dmt magneto telephone user-board 8 channels, unconfigurable rc3000-sub-dsr fxs user-board with polarity reversal function 8 channels, unconfigurable.

  • Page 16: 5. Parameters

    Raisecom technology co., ltd 15 5. Parameters 5.1. Line-board parameters: 5.1.1. E1 interface parameters: standard baud rate: 2048kbps±50ppm interface coding: hdb3 interface impedance: 75Ω（unbalanced）,120Ω（balanced） electric feathers: itu-t g.703 compliant frame format: itu-t g.704 compliant jitter:...

  • Page 17

    Raisecom technology co., ltd 16 rc3000-opt-ss23 sc/pc t1310/r1550 -5 ~ 0 -35 10 ~ 50 0.5 rc3000-opt-ss25 sc/pc t1550/r1310 -5 ~ 0 -35 10 ~ 50 0.5 rc3000-opt-s1fc dfc 1310 -15 ~ -8 -31 0 ~ 25 0.5 rc3000-opt-m dsc 1310 -15 ~ -8 -31 0 ~ 25 0.5 rc3000-opt-as1 dsc 1310 -15 ~ -8 -31 0 ~ 25 0.5 rc3000-opt-...

  • Page 18

    Raisecom technology co., ltd 17 return loss: 30-40 db balance: 60-70 db common-mode rejection ratio: 60-70 db power supply rejection ratio: vcc: 30 db vbat: 30 db idle channel noise: 75 db 5.2.2. Interface standard of fxo voice relay user-board (rc3000-sub-do): ring detect voltage: ≥35 v ring detect...

  • Page 19

    Raisecom technology co., ltd 18 return loss: 20 db maximum voltage of common-mode: 300 v common-mode rejection ratio: >55 db power supply rejection ratio: 30 db idle channel noise: 60 db note: ad gain and da gain are adjustable according to user’s requirement 5.2.4. Interface standard of e&m 4 audio...

  • Page 20

    Raisecom technology co., ltd 19 interface rate: n×64kbps（n=1-31） 5.2.7. Interface standard of ethernet data user-board (rc3000-sub-deth): rj-45 interface of utp, the longest tansmission distance of 5-category cable is 100m. Comply with ieee 802.3 standard, 10/100m auto negotiation, full/half duplex ...

  • Page 21

    Raisecom technology co., ltd 20 ring not detect voltage: ≤15 v 2w input impedance: normal and not ring status: 600Ω 2w input impedance: ring or abnormal status: 1000k Ω gain from 2w to 4w: 0±0.5 db frequency characteristic from 2w to 4w: 0±0.2 db gain from 4w to 2w: -3.5±0.5 db frequency characteris...

  • Page 22

    Raisecom technology co., ltd 21 5.4. Environment requirement temperature:0 ~ 50℃ relative humidity:≤90%（25 noncondensing ℃ ）.

  • Page 23

    Raisecom technology co., ltd 22 6. Structure and indicator lights 6.1. Fundamental structure: fundamental structure of rc3000 is as follows: rc3000 can multiplex or demultiplex local voice channels or data to any time slots (time slot 0 is not included) of rc7850’s 4 e1 through cross-matrix, the fol...

  • Page 24

    Raisecom technology co., ltd 23 find problems in time. Mpu control modue: this module is the system controller; once powered on it will check the data saved in the memory, if the data is valid mpu will configure device according to saved data, otherwise it will generate default data according to har...

  • Page 25

    Raisecom technology co., ltd 24 6.2. Front panel explanation: front view: 6.2.1. Globle indicator lights: sys（green）: indicates system work status. Flicking: system works normal. On: 1 cup works abnormal; 2 system configuration error or the following problems: 1．user-board communicates abnormally 2．...

  • Page 26

    Raisecom technology co., ltd 25 r e1 e-3（red）: alarm when bit error ratio is more than 10 -3 /s at remote r e1 e-6（red）: alarm when bit error ratio is more than 10 -6 /s at remote 6.2.4. E1 line alarm indicator lights: these indicator lights form a matrix, 1, 2, 3, 4 indicate 4 e1 line, used, los, l...

  • Page 27

    Raisecom technology co., ltd 26 hyper terminal. This operation will not affect the whole network management but only shielded that device for a while. Second bit : pc network management access. When this rc3000 is network management access device or network management is connected to its link up int...

  • Page 28

    Raisecom technology co., ltd 27 all user-boards support hot-swap and this operation will not affect device work status. 6.3.2. Line-board interface: there is one line-board slot for each rc3000 and the device cannot work without line-board. You must confirm the type of line-board when ordering becau...

  • Page 29

    Raisecom technology co., ltd 28 7. Function & application 7.1. Function and application explanation of rc3000: 7.1.1. Factory default configuration there is only hardware version of a new rc3000 and without any cross configuration. 7.1.2. Start self-check rc3000 will check all configurations when po...

  • Page 30

    Raisecom technology co., ltd 29 rc3000-2e1: single e1 direction. Rc3000-2e1 (adm): dual-e1 direction. Rc3000-4e1: single e1 direction. 7.1.4. Clock switch explanation in factory default status, clock mode of rc3000 is slave clock (trace first e1); the device can switch clock by itself in clock auto-...

  • Page 31

    Raisecom technology co., ltd 30 1e1 and 2e1. Rc will first use valid cross connect configuration information saved in memory, and erase invalid configuarion information automaticly. Rules for cross connection are as follows: a. All configurations will be refreshed if the line-board is changed and al...

  • Page 32

    Raisecom technology co., ltd 31 e. Remote alarm indicator f. Signal loss of multiframe alignment alarm g. Crc loss of multiframe alignment alarm there is no f and g alarm on device panel and you can get these alarm information through network management or hyper terminal. There are system alarms whe...

  • Page 33

    Raisecom technology co., ltd 32 in this topology the lines between each rc3000 are assistant network management channels, and for normal network management there must be network management topology configuration as follows: rc3000 a: double e1 channel direction rc3000 b: single e1 channel direction ...

  • Page 34

    Raisecom technology co., ltd 33 pin number signal explanation 3 rxd rx of rc3000 7 txd tx of rc3000 4,8 gnd ground of rc3000 b.Link up definition: network management interface link up is rc45 interface and standard rc232 voltage: signaling and pinouts: pin number signal explanation 3 rxd rx of rc300...

  • Page 35

    Raisecom technology co., ltd 34 7.2. Rc3000-sub-ds user voice card explanation fxs is a user voice card with feed voltage and feed ring and can be connected to exterior line interface of fbx. There are 8 channels of a fxs and the channel number is decided by hardware, unchangeable. Two rj45 interfac...

  • Page 36

    Raisecom technology co., ltd 35 7.3. Rc3000-sub-do voice relay card explanation fxo is a voice relay card for the relay of fbx voice channel and is connected to output interface of fbx voice channel. There are 8 channels of a fxo and the channel number is decided by hardware, unchangeable. Two rj45 ...

  • Page 37

    Raisecom technology co., ltd 36 7.4. Rc3000-sub-dso user-board explanation rc3000-sub-dso is a customized hybrid card of fxs and fxo, there can be n fxs interfaces and m fso interfaces (m, n can be 0, and m+n=8). There totally 8 channels decided by hardware, unchangeable. Two rj45 interfaces make up...

  • Page 38

    Raisecom technology co., ltd 37 fundamental structure of rc3000-sub-dm2: 7.6. Rc3000-sub-dm4 audio relay card explanation rc3000-sub-dm2 is a 4w audio relay card with e&m signal, used for signal and voice transmission between offices. There totally 8 channels decided by hardware, unchangeable. Two r...

  • Page 39

    Raisecom technology co., ltd 38 fundamental structure of: 7.7. Rc3000-sub-dv35 user-board explanation 7.7.1. Rules for channel allocation rc3000-sub-dv35 is a data user-board with v35 interface and the channel number is configurable, the rules are as follow: a. Rules for automatic channel distributi...

  • Page 40

    Raisecom technology co., ltd 39 of each) to access 4 user groups (user e1), and we refer these 4 user e1 as cross groups 5, 6, 7 and 8. The first user e1 is a main cross group and channels of this cross group will be distributed to user cards by default. Other user e1s are single cross group for dif...

  • Page 41

    Raisecom technology co., ltd 40 indicatore lights are all green: td: v35 data tx indicator light rd: v35 data rx indicator light lp_sta: loop indicator light. On there is local loop pat_ok: in normal work status is off. Do the rcr check: on normal off abnormal interface definition: name input/output...

  • Page 42

    Raisecom technology co., ltd 41 7.8. Rc3000-sub-deth user-board explanation 7.8.1. Rules of channel distribution: rc3000-sub-deth is an ethernet data user card with a 10baset interface, and please refer to configuration rules of rc3000-sub-dv35 user card. 7.8.2. Ethernet interface definition etherne...

  • Page 43

    Raisecom technology co., ltd 42 interface is as follows: channel 1 2 3 4 pins rj45-1 2rd,3td,1,4gnd rj45-1 6rd,7td,5,8gnd rj45-2 2rd,3td,1,4gnd rj45-2 6rd,7td,5,8gnd channel 5 6 7 8 pins rj45-3 2rd,3td,1,4gnd rj45-3 6rd,7td,5,8gnd rj45-4 2rd,3td,1,4gnd rj45-4 6rd,7td,5,8gnd note: 2rd is the input of...

  • Page 44

    Raisecom technology co., ltd 43 7.11. Rc3000-sub-dmt user-board explantion rc3000-sub-dmt is a magneto telephone interface card and can transimit magneto telephone calls (hot-wire magneto telephone). There are 8 channels whitch is decided by hardware, unchangeable. Two rc45 connectors make up of the...

  • Page 45

    Raisecom technology co., ltd 44 7.12. Rc3000-sub-dsr user-board explanation rc3000-sub-dsr is a phone interface card with polarity reversal function. There are 8 channels which are decided by hardware, unchangeable. Two rc45 connectors make up of the 8 channels and each rj45 connector has four chann...

  • Page 46

    Raisecom technology co., ltd 45 7.13. Rc3000-sub-opt-fe explanation optical line-board can communicate with main board and its initial value can be set through dip switches. There are 2 banks of 8-bit dip switches and definitions ard as follows: switch definition value explanation ffff s1 fffn s2 ff...

  • Page 47

    Raisecom technology co., ltd 46 through dip switches. There are 3 banks of 8-bit dip switches and definitions ard as follows: switch definition value explanation ffff s1 fffn s2 ffnf s3 ffnn ss13 fnff ss15 fnfn ss23 fnnf ss25 fnnn s1fc nfff m 1-4 optical module type other other status will be regard...

  • Page 48

    Raisecom technology co., ltd 47 8. Installation & verifying 8.1. Check when you first open the box check whether the type of device, spare parts and number are same with that of packing list. Make sure the device appearance is in excellent condition. There must be drying process if the device has be...

  • Page 49

    Raisecom technology co., ltd 48 offered, and when you need to transfer balanced interfaces to unbalanced ones rc909-4e1 of raisecom is available. C. Optical interface: sc connector is for optical interface. And if you are not sure of rx & tx direction, please connect the connector before device powe...

  • Page 50: 9.  Q & A

    Raisecom technology co., ltd 49 9. Q & a 9.1. Sys is on when there are alarms sys will be on. You can check the alarm information through network management or hyper terminal to confirm why the buzzer buzzes: a. Communication failure with user card. B. Communication failure with line-board when line...

  • Page 51

    Raisecom technology co., ltd 50 9.4. There is no alarm but voice channel is discontinuous or communication is abnormal generally asynchronism of multiframe causes this phenomenon, check whether there is loss of multiframe of rc3000 e1 interface or crc loss of multiframe. If there is loss of multifra...

  • Page 52

    Raisecom technology co., ltd 51 if these are not the reasons why you cannot manage the device, please contact us for technical support. 9.7. Device cannot be configured through console if the device cannot be configured through console, please check the followings: a. Check that proper cable is used...

  • Page 53: 10.

    Raisecom technology co., ltd 52 10. Appendix a: how to use hyper terminal to configure rc3000 10.1. Enter use the affixed console cable to connect console interface (rj45) of rc3000 with pc serial interface (db9), before connecting make sure that both rc3000 and pc have grounding protection; and you...

  • Page 54

    Raisecom technology co., ltd 53 in the properties menu, use vt100 to emulate as in figure 38: figure 40 now press enter to start configure rc3000 through hyper terminal. 10.2. Input the password before starting to configure the device you need to input the password (default password is raisecom), th...

  • Page 55

    Raisecom technology co., ltd 54 10.3. Main menu: if the password is right, you can start to operate: welcome to use raisecom communication device 1.Device set query 2.Cross set query 3.State info query 4.Alarm query 5.Set 6.Operate 7.Version 8.Console set 9.Quit command: 1-9, display menu:m command:...

  • Page 56

    Raisecom technology co., ltd 55 10.4.2. Line-board information (ram): in device set query menu press number key 2, and then there will be device line-board information: real information: line-board type:2e1 board ( line-board card name ) device query command:1-8, menu display:m, return:q command: th...

  • Page 57

    Raisecom technology co., ltd 56 10.4.4. E1 using and mode information: indevice set query menu press number key 4, and there will be e1 using and mode information: e1: first second third fourth real information: use: 1=using 1 1 0 0 mode: 1=pcm31 0 0 0 0 mask: 1=mask 0 0 0 0 eeprom set: use:1=using ...

  • Page 58

    Raisecom technology co., ltd 57 net topology: single e1 direction double e1 dircetion three e1 dircetion four e1 dircetion net using time slot: 0 time slot 1 time slot crc transmit: eanble disable 10.4.6. E1 alarm mask information: indevice set query menu press number key 6, and there will be e1 ala...

  • Page 59

    Raisecom technology co., ltd 58 channel:main channel local loopback:loopback remote loopback:no loopback error code test:disable 7235 auto adjust phase:enable adjust receive phase:enable(clock down) dtr state:1(unready) rts state:1(unready) dcd state:0(ready) cts state:0(ready) note: parameters of p...

  • Page 60

    Raisecom technology co., ltd 59 signal:exist signal in:original signal out:original signal bit(d7:d0):a a a a a a a a device query command:1-8, menu display:m, return:q command: 10.4.8. User-board information (eeprom) device set query menu press number key 8 you can get the same information saved in...

  • Page 61

    Raisecom technology co., ltd 60 10.5.2. Four user cross query (ram) in cross set query menu, press number key 2 and there will be the following information: input group no. (1-4, esc=cancel): enter group number 1, cross connection of the first e1 will be displayed: first user group cross set channel...

  • Page 62

    Raisecom technology co., ltd 61 indicates there is no cross connection. Address indication: result of row number plus column number is the channel number. For example: （5 17）,the address is 16+1=17 that is to say the data in this cell is the cross connection of the 17 th channel of first e1 (cross g...

  • Page 63

    Raisecom technology co., ltd 62 10.6.1. Receive state query in state information query menu press number key 1 there will be the following information: input group no.(1-4, esc=cancel): enter group number 1, there will receive signal status information: first group receive state channel 1 2 3 4 5 6 ...

  • Page 64

    Raisecom technology co., ltd 63 2e1 alarm:no alarm alarm query command:1-2, menu display:m, return:q command: note: e1 interface alarms include: los, ais, lof, ral, lomf, crc and crc lomf optical interface alarms include: optical los, frame lof , e-3 error and e-6 error alarms include: e1 interface ...

  • Page 65

    Raisecom technology co., ltd 64 10.9.1. Id set in system set menu press number key 1 to configure device id: deviceid=2 input device id(0-255): the first row is device present id and the second row is for user configuring a new id. If you do not input number but press enter key, the old id will be e...

  • Page 66

    Raisecom technology co., ltd 65 10.9.4. E1 set in system set menu press number key 4 to configure e1 interface and the menu will be: 1.Use set 2.Mode set 3.Mask set 4.Crc set e1 set command:1-4, menu display:m, return:q command: the explanation of each command is available in 8.10 e1 set 10.9.5. E1 ...

  • Page 67

    Raisecom technology co., ltd 66 panel, all rc3000 devices can be managed. To realize whole network management the following rules must be obeyed: if time slot 0 is network management channel, the maximum rate of serial data is 2400bps, otherwise there will be error codes. If time slot 1 is network m...

  • Page 68

    Raisecom technology co., ltd 67 in this topology, the configuration of each device is as follows; device 1: set the second bit of dip-switches on, and others off; use two e1, time slot 0 and single e1 direction. Device 2: set all dip-switches off; use two e1s, time slot 0 and double e1 direction. De...

  • Page 69

    Raisecom technology co., ltd 68 0 and single e1 direction. Device 5: set all dip-switches off; use one e1, time slot 0 and single e1 direction. To avoid error the above configuration is recommended. 10.9.7. Alarm sound set in system menu press number key 7 to configure the alarm sound: alarm sound o...

  • Page 70

    Raisecom technology co., ltd 69 user-board2(v35 user board) set command:1-8, menu display:m, return:q command: note: the command explanation is available in 8.12 v35 user board set menu. When the user-board type is 8 (ethernet data user-board), the menu will be: 1.Sub-board slot number 2.Channel sel...

  • Page 71

    Raisecom technology co., ltd 70 10.10.1. Alarm mask set in optical line-board set menu press number key 1 to configure optical alarm mask: optical alarm mask set: local optical loss:(enable) in this statu use → key to disable or enable alarm mask; use ↓↑to change items (alarms); press enter to confi...

  • Page 72

    Raisecom technology co., ltd 71 10.10.5. Ether net port work set in optical line-board set menu press number key 5 to configure ethernet interface work status: ether net work state set: auto mode:enable in this statu use → key to change configured value (enable or disable); use ↓↑to change configura...

  • Page 73

    Raisecom technology co., ltd 72 run this command (y/n): press y key to confirm the operation and press n key to return, others keys are invalid. 10.11. E1 set this section will explain the command in e1 set menu. 10.11.1. Use set in e1 set menu press number key 1 to configure the e1 use status: firs...

  • Page 74

    Raisecom technology co., ltd 73 fourth e1; fourth e1 los; fourth e1 ais; fourth e1 lof fourth e1 ral; fourth e1 lomf; fourth e1 crc lomf fourth e1 crc alarm note: if the line-board is 2e1 line-board only 2 e1 can be configured. 10.11.4. Crc set in e1 set menu press number key 4 to configure crc chec...

  • Page 75

    Raisecom technology co., ltd 74 10.12.3. Signal bit in user board set menu press number key 3 to configure the signal bit: first channel signal bit:a in this status use → key to change signal bit; use ↓↑to change configuration items; press enter to confirm configuration, press e key to finish config...

  • Page 76

    Raisecom technology co., ltd 75 collision alarms. And limitation for main cross group (user e1 1) is: when v35 user-board uses main cross group to transfer data the number of channels will not same for different slots. Channel number range for first slot is 0-31, 0 indicates that shutdown the transm...

  • Page 77

    Raisecom technology co., ltd 76 10.13.5. Loopback set in v35 user board set menu press number key 5 to configure loopback status of v35 user board: local loopback set:no loopback in this status use → key to change loopback status; use ↓↑to change configuration items; press enter to confirm configura...

  • Page 78

    Raisecom technology co., ltd 77 180-degree shift. Disable this function and set the rx data phase positive: the rx data phase will be 0 degree; disable this function and set the rx data phase negative: the rx data phase will be 180 degree; enable this function and set the rx data phase positive: the...

  • Page 79

    Raisecom technology co., ltd 78 10.14.4. Default port mode in ethernet user board set menu press number key 4 to set the default port mode: default port model:half duplex in this status use → key to change the configured value: full duplex of half duplex; press enter to confirm configuration, press ...

  • Page 80

    Raisecom technology co., ltd 79 10.16.1. Cross set in cross set menu press number key 1 to configure the cross connect: input group number (1-8): first input the cross group number: first channel: there are two parts of configured data for each channel: a group number and a channel number (there mus...

  • Page 81

    Raisecom technology co., ltd 80 in this statu use → to change the configured value: retain & clear, press enter to confirm. In the configuration process press esc to exist and the above configurations will be invalid. (there are seven steps of this configurarion: group no. For time slot out, time sl...

  • Page 82

    Raisecom technology co., ltd 81 delete cross connect of cross group 1 1-5 channels and its correlation configuration: group no. For delete cross:1 time slot start no. For delete cross:1 time slot number for delete cross:5 delete releation:clear then cross connect of cross group 1 1-5 channels and it...

  • Page 83

    Raisecom technology co., ltd 82 note: system initialization will set all configurations in 0 status, and parts restore to factory default value. All cross set will be cleared. 10.17.4. Clear cross set in operate menu press number key 4 to clear cross set: run this command,the device will format all ...

  • Page 84

    Raisecom technology co., ltd 83 can not save data to eeprom. 10.18. Version in main menu press number key 7 to get version information: 1.Display version information version information command: 1-1, menu display: m, return: q command: 10.18.1. Display version information in version menu press numbe...

  • Page 85

    Raisecom technology co., ltd 84 enter your password and press enter for next entering: input new password again: enter your password and press enter to confirm (there will be * prompt for each entered character). If it is same with the last entered password, the password configuration will be succes...

  • Page 86

    Raisecom technology co., ltd 85 @2005 raisecom technology co., ltd. All trademarks are the property of their respective owners. Technical information may be subject to change without prior notification..