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| section 7

Audio

Analog Inputs

2x send analog inputs

♦

2x Program-on-Hold analog inputs

♦

XLR female, pin 2 high. Active balanced, with RF protection.

♦

Output level

♦

adjustable from –7 to +8 dBu (nominal)

Analog clip point

♦

+21dBu

Output impedance

♦

<60 Ohms x2

Analog-to-digital converter resolution

♦

20 bits

Analog Outputs

2x receive analog outputs

♦

XLR male, pin 3 high.

♦

Input level

♦

Adjustable, -7 to +8 dBu (nominal) level.

Impedance

♦

Bridging, >100K Ohms

Digital-to-analog converter resolution

♦

24 bits

Headroom before clipping

♦

20 dB from +4dBu nominal level

AES3 Digital Inputs/Outputs (option)

The AES input/output option module substitutes 2x input and 2x output AES XLRs in place of

the standard analog, providing 4x in/4x out channels.

Conform to AES3 standard

♦

Sample rates

♦

32, 44.1, and 48kHz.

Rate conversion

♦

Input and output, independently selectable

Clock

♦

AES input or ISDN network clock.

Input Level

♦

Adjustable -27 to –12 dBfs

Output Leve

♦

l Adjustable –27 to –12dBfs

Livewire

Livewire connection is standard for all hybrids in/out and POH audio in

♦

Audio Performance

Frequency Response

± .5dB, 50 to 20kHz (swept sine procedure, measured from analog input

to output with unit in loopback mode)

THD+N/Input

<0.06% typical (Measured at 0 dBu @ 1 kHz analog in to AES out in loop-

back mode)

Switching Matrix and Conferencing

All-digital audio routing and switching

♦

Содержание Nx12

Страница 1: ...TELOS Nx12 Advanced Digital Broadcast Telephone System USER S MANUAL Manual Version 1 6 for software version 1 0 and later 30 July 2008...

Страница 2: ...p for the email notification service offered on the site Feedback We welcome feedback on any aspect of the Telos Nx12 or this manual In the past many good ideas from users have made their way into sof...

Страница 3: ...of equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference If it does the user will be required to eliminate the interferen...

Страница 4: ......

Страница 5: ...6 2 4 ISDNTechnology 101 6 Alphabet Soup U S and NT1 6 Data andVoice 7 Hunt Groups 7 Special Considerations for Euro ISDN ETS 300 users 7 Ordering Help 8 2 5 Connecting the Nx12 to ISDN 8 ISDN in USA...

Страница 6: ...22 2 11 AC mains Power 23 3 BasicConfiguration 25 3 1 Step by Step 25 3 2 Configuration forTelephone Lines 25 Analog Phone Line Setup 26 ISDN Setup 26 Is the ISDN working 28 3 3 Audio Input and Outpu...

Страница 7: ...us 45 5 3 Using the LCD Buttons andWeb for Configuration 46 The LCD Button User Interface 46 TheWeb User Interface 46 5 4 The Audio Menu 47 Nominal Input Level 48 Nominal Output Level 48 Meter Mode 48...

Страница 8: ...12 Two studio Modes 62 Selecting a Show on the Desktop Director and other controllers 64 5 8 Livewire 65 Quality of Service 67 Axia Consoles 67 5 9 Firmware Update 68 5 10 Other Uses of the IP Etherne...

Страница 9: ...tion not available 85 CLASS 1 4 service or option not implemented 86 CLASS 1 5 invalid message e g parameter out of range 87 CLASS 1 6 protocol error e g unknown message 87 CLASS 1 7 interworking clas...

Страница 10: ...USAISDNOrderingGuide 115 Dealing with the Phone Company 115 Details Details 115 FAXABLE ISDN ORDER FORM for the USA Canada 117 A4 Euro ISDNOrderingGuide 123 Details Details 123 FAXABLE ISDN ORDER FOR...

Страница 11: ...dio equipment can connect with analog AES3 or Livewire IP audio Features Benefits Telos products have earned a reputation for ease of use and outstanding performance and the Nx12 lives up to that repu...

Страница 12: ...more than a hundred years old analog scheme ISDN offers us a way to link our studios directly into the Telco digital infrastructure without the usual impairments of analog connections In all digital...

Страница 13: ...a modern digital approach to controlling calls and conveying status information about them ISDN call set up times are often only a few 10s of milliseconds enhancing production of a fast paced show Per...

Страница 14: ...tion to improve quality on calls originating from VoIP or mobile telephones Each hybrid is complemented by powerful signal processing functions to extract the best possible quality from real world pho...

Страница 15: ...d Connect any needed parallel GPIO This Installation section covers all of the above After completing these steps you will be ready to move on to configuration and testing 2 2 Connections to theTelco...

Страница 16: ...telephone lines POTS or already know ISDN basics you can skip on to the next section ISDN lines come in two varieties Basic Rate Interface called BRI S or ISDN 2 in various parts of the world and Pri...

Страница 17: ...Circuit Switched Voice CSV capability as well as data TIP If this line may be borrowed at times for use with an audio codec such as the Telos Zephyr you need to be sure that the Circuit Switched Data...

Страница 18: ...he telephone central office directly to the RJ 11 style U interface modular jack on the rear panel Each module has 3 jacks and each jack has an associated LED IMPORTANT Remember that the U interface c...

Страница 19: ...12 S Interface RJ 45 PIN DESCRIPTION 1 N C 2 N C 3 Transmit to network 4 Receive from network 5 Receive from network 6 Transmit to network 7 N C 8 N C ISDN S interface cable Use only an 8 conductor RJ...

Страница 20: ...o report your experiences with other switches Using POTS Most PBX or VoIP telephone systems can provide analog ports for analog equipment such as modems and fax machines You will need such ports to co...

Страница 21: ...trange or erratic performance is experienced The quickest test is to bring up only the hybrid in question on the board and select a line Dial tone should not appear on the send meter of the hybrid in...

Страница 22: ...ngement is flexible allowing the operator to place any or all sources in Utility for the caller to hear In our example we have the fortunate case that the console permits the Utility bus to be fed pre...

Страница 23: ...for the each channel that has the corresponding caller audio Using a production style console The production style consoles often used for TV audio will have multiple Aux send busses that can be used...

Страница 24: ...hybrid isn t doing a good job of preventing the send audio from leaking to its output the remote mix minus is corrupted Remember if any of the announcer audio from the remote site is returned it will...

Страница 25: ...he send inputs are adjusted using Nominal Input Level in the Audio menu The Input meter indicates the level after the adjustment and before the AGC See Sections 3 3 5 1 and 5 4 for additional informat...

Страница 26: ...ow Mode which is described in Section 5 7 POH Program on Hold Inputs This analog input is for whatever audio you want callers to hear when put on hold usually your main program feed This is an XLR fem...

Страница 27: ...AES 2 Right is from Hybrid D 2 8 Desktop Director Ports At the time this manual was released the following devices were available to connect to these ports Desktop Director Extended Desktop Director C...

Страница 28: ...two more telephone line columns making four in total Call Controller The call controller along with a POTS telephone emulates the functionality of the Desktop Director It is suitable for any case wher...

Страница 29: ...an external power supply Telos Desktop Director Power Supply Kit part 2091 00001 In that case your set up will look like this The Desktop Director must be within 2300 feet 700 meters of the Nx12 The p...

Страница 30: ...nd then lifted out to pop the cap loose You will see a black rectangular transformer labeled T1 To the right of T1 locate and 4 remove the jumpers labeled JP1 JP2 These are small jumper blocks which c...

Страница 31: ...model P61 U10P Supra Polaris noise canceling unamplified binaural headsets for direct connection to the Desktop Director www plantronics com Other headsets can be used however an external amplifier i...

Страница 32: ...For details on using Web based configuration see Section 5 3 For information on using Telos Assistant Producer and other call screening applications see Section 5 10 2 10 Parallel GPIO Remote Control...

Страница 33: ...to Mike Schweizer for contributing this tidbit Input Characteristics The NX12 s inputs are designed to be universal They accept either a voltage source up to 24VDC or a closure to ground which may be...

Страница 34: ...wer to the unit with a standard IEC International Electrotechnical Committee power cord and provides an on off switch The power supply has a universal AC input accepting a range from 100 to 240 VAC 50...

Страница 35: ...DN is working Read up on Desktop Director Operation See Section 4 Configure the various audio options for processing etc See Section 5 4 If you will split the Nx12 between two studios see Section 5 7...

Страница 36: ...one DN MSN BRI 1Line 1 ______________________ _________________________ Line 2 ______________________ _________________________ BRI 2Line 3 ______________________ _________________________ Line 4 ____...

Страница 37: ...r LDNs are your usually 7 digit phone number as listed in the telephone directory They normally do not include the area code In some cases you may need to enter 10 digits for your DNs If you have diff...

Страница 38: ...ee this screen just repeatedly press the or button until you see this screen If you do not see READY for each ISDN channel on the Status screen try rebooting the system from the System Reboot menu If...

Страница 39: ...k we assume that you are able to make a call to yourself And that you have configured your audio input output settings Congratulations you just have some tweaking to do and your basic installation and...

Страница 40: ...r 2 bargraphs in the previous test In that case you can skip the next test See Sections 2 7 and 5 4 for detailed information about the Nx12 s mix minus options Now we will verify the second mix minus...

Страница 41: ...ok over other sections of this manual to familiarize yourself with the system and to set up the following parameters Desktop Director operation See Section 4 Receive EQ AGC Noise Gate See Section 5 4...

Страница 42: ...32...

Страница 43: ...Tip Since certain functions work differently in Talent versus Producer mode it is important to understand that there are two modes and how to switch between them Status Symbol Icons The Desktop Direc...

Страница 44: ...n Air Locked Column 2 Call is locked and cannot be dropped or placed on hold To unlock press the line button to the right of this icon Screened Hold Call is on hold and has been screened by the Produc...

Страница 45: ...t or in hands free mode locks the caller To unlock press that Line button a third time The right row of buttons is used to place a caller on Screened Hold For more details on how screened hold works s...

Страница 46: ...from accepting any calls For ISDN lines the caller may get a busy signal or they may continue to hear ringing For analog lines the ringing calls will be connected to a silent audio channel Further cal...

Страница 47: ...is used for general information and for configuring the Desktop Director Items can be selected and changed using the six buttons immediately below the LCD screen The buttons in the row immediately bel...

Страница 48: ...programing functions for two studio modes where each pair of hybrids is assigned to one of two studios See Section 5 6 Adjust LCD Panel Gives access to the same menu as the LCD button on the main scre...

Страница 49: ...ct the line which has been ringing longest If no line is ringing it selects the line which has been on normal hold longest When the Next button is pressed any lines not locked will be dropped or put o...

Страница 50: ...you can select another line without losing the first call If you wish to add a third party lock the second line by pressing the line button for the second caller You can add additional lines in this m...

Страница 51: ...if your system is serving two studios and you only have one active line column you can use the lock function for conferencing Press an already on air line button a second time to lock the line The sta...

Страница 52: ...as been ringing longest 4 2 The Call Controller The Call Controller together with a user provided telephone emulates a Desktop Director See the Call Controller manual for additional information Becaus...

Страница 53: ...een review the information in Sections 2 4 2 5 and 3 2 and check both your ISDN settings and set up information If the information there does not help there is in depth troubleshooting information in...

Страница 54: ...op current SPID Pend SPID has been sent to network DMS Cust And Natl I 1 only Network has not approved SPID SPID is incorrect SPID Error The SPID has been sent and rejected by the CO switch Ready The...

Страница 55: ...y the Nx12 Whenever a Desktop Director is activated an Errors number is indicated This corresponds to the number of data packets lost since this Desktop Director was powered on An occasional er ror is...

Страница 56: ...ow buttons to can change the value of the setting When you reach the value you desire press the OK button again to lock it in and return you to the item selection scroll mode TheWeb User Interface A W...

Страница 57: ...d to enter a user name and password The default user name is user and the password is blank The Status System Telco and Audio menus provide access to the full set of configuration op tions a superset...

Страница 58: ...eir Livewire network according to this standard Nominal Output Level This adjusts the level of analog AES and Livewire outputs Output Setting Related to Output Level Output Gain Setting 10dBV 0dBu 4dB...

Страница 59: ...ome just as much a problem as low level callers Therefore we have changed the AGC to act as a platform leveler The Nx12 uses a dB linear approach to AGC with a feed forward topology which provides a c...

Страница 60: ...or disables the acoustic adaption process used for feedback control when the system is used with an open speaker to microphone acoustic path This setting also increases by 6dB the amount of send to ca...

Страница 61: ...tion means each mixing console only has to make a single mix minus feed for the caller send audio for each show but separate hybrid caller audio outputs are sent to the console This mode is useful whe...

Страница 62: ...pose is to accommodate older consoles that have only one mix minus or when only one fader is available for telephone calls The disadvantage is that the operator has no control of the relative levels o...

Страница 63: ...AES or LW For AES POH may be analog or AES Livewire can always be used for any of the four caller and two POH inputs When a Livewire input is enabled the corresponding analog AES input is disabled Li...

Страница 64: ...e AES XLR input 2 both L R channels The following table shows the relationships of AES to the input and output signal paths shown in the block diagrams above 2 channel 1 XLR connection 2 channel 2 XLR...

Страница 65: ...that might be sometimes useful preventing outgoing calls Enable Auto Call Drop Web only Calls can be automatically disconnected when the far end hangs up Most USA style Telco lines provide a momentary...

Страница 66: ...able to guess Guessing the ISDN Protocol setting in Canada the USA If you were given only a single phone number and no SPIDs try AT T Cust If you were given 2 SPIDs with the format 01 7 digit phone 0...

Страница 67: ...where you will see POTS ISDN or EMPTY for the A and B line groups depending on how your system is configured Press any menu button twice to get this screen When you are using Natl I 1 or DMS 100 for...

Страница 68: ...enter anything in the SPID fields MSN Multiple Subscriber Number This item if required must be configured from the Web interface Used only when you are using the ETS 300 Euro ISDN Telco mode and anot...

Страница 69: ...Telco condition Most users should leave this set to the default setting of Hold Last 5 6 The System Menu This menu consists of items that affect basic system operation TCP IP Setup The Nx12 and PC hos...

Страница 70: ...Adjusts the contrast of the LCD Values range from 0 to 10 The usual setting is 5 Show Mode LCD Only The Web Setup Wizard is another way to select show mode The term Show comes from our Series 2101 sy...

Страница 71: ...es are Off This is the normal operating mode No loopback path is turned on Studio Input is sent as send audio and caller audio is presented at Studio Out Studio This loops the AES EBU input and analog...

Страница 72: ...d mix minused internally to appear as if they were two Or one depending upon Mix Minus mode Each Desktop Director column can use up to two hybrids with the first call on the left column connecting to...

Страница 73: ...1 through 12 Lines 1 through 11 are normal lines while Line 12 is a priority line Line 12 is not affected by the Block All function Show 2 Hybrid C D also has access to lines 1 through 12 When a line...

Страница 74: ...r ity Ring Output pin 2 on the parallel control port will go true Press the SELECT button to accept your changes 6 Note You must reboot the system after configuring this setting Be sure to attach the...

Страница 75: ...ge shows Press the following button sequence to associate the Console Director with Show 1 2 Hybrid 1 S H O W 1 or 74691 Press the following button sequence to associate the Console Director with Show...

Страница 76: ...he Axia Element when taking one of these as a source will automatically connect both directions and provide the mix minus Cool eh The two Program on Hold connections are Livewire destinations meaning...

Страница 77: ...e connections are bi directional multi channel and include control This means that a single RJ 45 can interface all necessary Nx12 signals to an Axia console Livewire simplifies mix minus because each...

Страница 78: ...and then the System page will return The new software will be in Nx12 s Bank 1 You can make it active by clicking the Bank 1 radio button and then Apply You can keep two firmware versions and choose b...

Страница 79: ...s Telnet Since Windows comes with a simple telnet client we will give you some tips on using this par ticular software Run the HyperTerminal application at Accessories Communications Hyper Terminal Th...

Страница 80: ...logon lw mcheck meter minonhook mixpoll mr mw potscountry prio quit reboot ringtimo test ti tslot For a description of a command type help or followed by the name of a command Example CPC return Comma...

Страница 81: ...frequency shifter pitch shifter inserts a small unnoticeable shift in frequency to the send audio to prevent feedback buildup when the system is used with open speakers Send Automatic Gain Control Li...

Страница 82: ...wnward expander The downward expander reduces low level line noise when no caller audio is present And reduces low level leakage thereby improving hybrid performance This function is cross coupled wit...

Страница 83: ...e 6dB Feedback Control We ve carefully designed the Nx12 so that problems with feedback should be rare However despite excellent trans hybrid loss and a number of other features you can probably induc...

Страница 84: ...d to help in those situations where open speakers are a require ment Whenever possible of course it is best to use headphones to listen to the caller audio We have found the best scheme is to have the...

Страница 85: ...swapping subsystems such as plug in modules or power supplies The Telos customer support crew is standing by to assist with this if you need it 6 2 System Software Firmware ViewingVersion Information...

Страница 86: ...roubleshooting sequence in detail Step 1 Observe the behavior to find the apparent bug In other words determine the bug s symptoms Remember always that many problems are subtle and exhibit themselves...

Страница 87: ...s is displayed here One of the following status words will be shown for each active ISDN channel Deactivated No line connected or connected to wrong jack on the TWOx12 OR ETS 300 permits the Telco to...

Страница 88: ...ill remain in the rapidly flashing state This state indicates a loss of the ISDN BRI circuit at the lowest physical level Try another connecting cable or another line If the NT1 can contact the centra...

Страница 89: ...int is the ISDN status accessible on the LCD by pressing any menu button twice Condition System says Ready but attempted calls do not complete goes back to Ready or stays at Seize pending Are your SPI...

Страница 90: ...using 10 digits rather than 7 digits or vice versa What is consistent about the problem look for patterns Keep watching for a pattern Enlist the help of the users We ve seen apparently random prob lem...

Страница 91: ...s with a given port Desktop Director or cable 6 6 Replaceable Modules and Hardware Servicing WARNING DANGER Remove all connections including the Telephone Audio and Electrical Mains Power cord before...

Страница 92: ...e that particular transit network while it does exist does not serve the equipment which is sending this cause or This cause indicates the prefix 0 is invalid for the entered number Cause No 3 No rout...

Страница 93: ...alue may be generated by the called user or by the network In the case of user determined user busy it is noted that the user equipment is compatible with the call Cause No 18 No far end response No u...

Страница 94: ...ncement Cause No 29 Facility rejected Special Intercept announcement undefined code This cause indicates a facility requested cannot be provided by the network or This cause indicates that a user in a...

Страница 95: ...le to deliver user information i e user to user information low level compatibility or sub address etc to the remote users as requested Cause No 44 No channel available Requested circuit channel not a...

Страница 96: ...This cause indicates an inconsistency in designated outgoing address information and subscriber class or This cause indicates that a Terminal Diversion in a VN4 network has been rejected Cause No 63 S...

Страница 97: ...ause No 88 Incompatible destination This cause indicates that the equipment sending this cause has received a request to establish a call which has low layer compatibility high layer compatibility or...

Страница 98: ...edures indicate is not a permissible message to receive at this time or This cause indicates that the switch sending this cause is clearing the call because a threshold has been exceeded for multiple...

Страница 99: ...requested network does not support the user end to end transfer capability CLASS 1 7 interworking class Cause No 126 Switch to conversation mode VN 4 only This cause is used to indicate that conversa...

Страница 100: ...90 Section 6...

Страница 101: ...lable Up to eight Desktop Directors may be connected Computer control such as with Telos As sistant Producer call screening application is supported over an Ethernet LAN connection Processing Function...

Страница 102: ...option The AES input output option module substitutes 2x input and 2x output AES XLRs in place of the standard analog providing 4x in 4x out channels Conform to AES3 standard Sample rates 32 44 1 and...

Страница 103: ...oop current ring signaling and flash time Includes caller ID decoding using Bellcore 212 modem standard Desktop Director Ports Four ports permitting connection of 4 Telos Desktop Directors Eight direc...

Страница 104: ...ed hybrid Note the following With analog audio in out there are only two total inputs and outputs So the Nx12 must be used in a mode that combines the hybrids into two groups of two each The AES optio...

Страница 105: ...Specifications 95...

Страница 106: ...96...

Страница 107: ...ents or authorized dealers be liable for inciden tal or consequential damages or for loss damage or expense directly or indirectly arising from the use of any Product or the inability to use any Produ...

Страница 108: ...98...

Страница 109: ...piled from our direct experience helping clients with ISDN installations Your SPIDs may be different of course The SPID is distinct from your telephone number and does not necessarily contain your are...

Страница 110: ...or 01YYYZZZZ000 or XXXYYYZZZZ00 or 01YYYZZZZ0 or XXXXYYYZZZZ or SPID1 XXXYYYZZZZ00 SPID2 XXXYYYZZZZ01 or SPID1 XXXYYYZZZZ0000 SPID2 XXXYYYZZZZ0001 or SPID1 XXXYYYZZZZ0000 SPID2 XXXYYYZZZZ0101 Nextlink...

Страница 111: ...zon See Bell Atlantic or GTE Vermont Telephone XXXYYYZZZZ0101 Quest See US West Rochester Telephone 01YYYZZZZ0 SBC See Pac Bell Ameritech or Southwestern Bell SNET Southern New England Telephone 01YYY...

Страница 112: ...102...

Страница 113: ...dem Switch and Tandem Tie Trunk Switching below Bell Labs The basic research facility that was AT T s primary research facility Bell Labs was originally part of Western Electric and was spun off with...

Страница 114: ...equipment to ISDN equipment as part of the call control signaling protocol The cause code indicates that a network call related event has occurred or has failed Since these codes actually come from th...

Страница 115: ...ele phone circuit lead Contains Switches and Trunks as well as the local telephone circuits Codec COder DECoder A device which takes digitized audio and codes it in order to reduce the transmission bi...

Страница 116: ...number of emerging DSL technologies DSU Data Service Unit See CSU DSU by the end user See NCTE and DSX1 CSU DSU A device which incorporates the functions of a CSU Channel Service Unit and a DSU Data...

Страница 117: ...r an unused jack to plug a cord into This arrange ment is very common in business scenarios where a single incoming number the Listed Directory Number is given to the public but multiple incoming chan...

Страница 118: ...phone Directory and given to customers Sometimes called a Pilot Number See also DN and Hunt Group LE Local Exchange European term for Central Office See CO POTS lines or a 2 wire intercom to a four wi...

Страница 119: ...pinion Score Grade is a measure of codec quality ranging from 1 to 5 These are derived from subjective tests with listening panels comprised of both experts and people from LEC Local Exchange Carrier...

Страница 120: ...AT T Custom Point to Point Custom ISDN Pro tocol Point to Point lines have only one incoming phone number which must be dialed twice to connect to both lines the first call goes to line 1 and the seco...

Страница 121: ...nnel Interoffice Signaling CCIS system Previous to SS7 the Bell System used SS6 which did not support the International tom ISDN and ISDN Protocol RBOC Regional Bell Operating Company USA One of the r...

Страница 122: ...ntically configured test line in Freising Germany at 49 81 61 42 061 dial this number twice Terminal Adapter See TA Standards SS7 does It allows for substantially flexibility and power in dynamically...

Страница 123: ...gle circuit if that circuit has multiple channels The trunks most users will deal with are between the Telco switch and a PBX However a Tie Trunk can connect two PBXs See also Tie Trunk and Trunk Grou...

Страница 124: ...114 Appendix 2...

Страница 125: ...ive of telephone network routing each channel appears to be a separate line with it s own number and independent dial out capabilities Since each has to be dialed or answered separately they appear to...

Страница 126: ...matters with our application but we must enter the SPIDs nevertheless Most of the telephone companies have agreed to implement a standardized SPID for new installations The standard is area code phon...

Страница 127: ...for the Nx12 varies depending upon protocol and is included on the order forms IOC Capability Packages provisioning package More and more Telcos are using ISDN Ordering Code IOC capability packages f...

Страница 128: ...ed Voice CSV We may also use this line for other equipment that makes calls using Circuit Switched Data CSD service Please advise us if there is a cost penalty for having both CSD and CSV If you use I...

Страница 129: ...onic Key Tele phone Sets EKTS shared directory numbers accept special type of number intercom groups network resource selector modem pools message waiting hunting interLata competition etc Note for AT...

Страница 130: ...r Number of CSD calls 2 Terminal Type A Number Display No Call Appearance Pref Idle 10XXXXX Long Distance Prefix Yes Turn off features such as packet mode data multiple call appearances Electronic Key...

Страница 131: ...That is why this is sometimes called 2B D service You can use the B channels but only the phone companies and equipment manufactur ers can usually use the D channel ISDN comes into your facility on tw...

Страница 132: ...Termination Type 1 converts this to the two pair S interface In Europe Asia South America and most of the world the NT1 is always pro vided by the phone company and only the S interface may be on user...

Страница 133: ...is device interfaces studio audio equipment to ISDN It requires Circuit Switched Voice CSV The Nx12 has an integral BRI terminal adapter which supports the ETS 300 Net3 protocol Hunt Groups please giv...

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