testline.txt - Terminating Test Line Access+Capabilities (OAM+P(Operations, Administration, Maintenance, and Provisioning)) phlux 2/26/2003 ############ Disclaimer: # ################################################################### So I was talking to the phantom phreak. He was all schooling me on the ups and downs of redboxing. Little did he know canadian tones are different. So I then proceeded to 3 way a loud test tone, then hes going off on that tone all like 'o0o0o that sounded like the old 1000hz... no wait, 1004? Hey 3 way it again...' so he then proceeded to school me. Said he had this doc(t1207) from 2000(current) and that it originally started off as the Test Line Dictionary back in '89. What follows is my one way conversation with the phantom phreak as he babbled on and on about this test line dictionary. It is kinda 'leet - good thing I record all my calls. If you have any issues with this file, direct your e-mail to the phantom phreak. Respect: You probably got this file from hackcanada.com, nettwerked.net or ghu.ca so thanks go their way. Dedicated: my gramma, she drop yo trunk, make it flop like a grand mal' funk. gets mad props fo schoolin shes tolds ANI F'in the law, keeps codes in her bra, under skin folds. my gramma, whistles 26 hun on the run, packs a 9 hacks on defcon party line gets mad slops, drops dentures fuckin cops, BOI the shit she stirs gives good head, then POPS unlike a kitten she purs some fed, in her bed can in tha purse, paints walls with merz. filled with lead that fed is DEAD. ########## Contents; # ##################################################################### # Scope # Definitions # Abbreviations # Intro # Terminating Test-Line Definitions # Test Connection Arrangements # Test Line Access Methodology # Bibliography ###### Scope # ######################################################################### Defines types of terminating test lines and their operational functions, provides numbering plan arrangements to access these capabilities for testing across interconnections in the PSTN. Outlines in this standard applies to both end user and network providers access to existing and proposed terminating test lines from originating, intermediate and termianting points in the network. This standard also described access to terminating test lines for exchange carriers, IXC's, and CPE's such as PBX's, ISP's, etc. This standard does not include originating control devices. General descriptions of test line types are included in this standard since they link specific test access to test lines that perform specific functions in a defines manner to ensure uniform operation across network interfaces. ############ Definitions # ################################################################### CPE Customer Premises Equipment=Equipment located at customers location. Subscriber Line = Herein, the term subscriber line is defined as a dedicated facility between a network provider's switch and a customer's POI (point of interface) Trunk = the common (outside plant) facility between a network providers switch and the POI to another switch, which may or may not include a PBX. Originating line side access = the ability to dial the appropriate 7 or 10 digit test # from a subscriber line. Originating trunk side access = the ability to dial the appropriate test line # with trunk access utilizing the appropriate test equipment. ############## Abbreviations # ################################################################# AT = access tandem (exchange carrier(EC)) ECT = Exchange Carrier Tandem EO = End Office IC = Interexchange carrier ICT = Inter-exchange carrier tandem IPM = Interruptions per minute LS = Line side OSPS = Operator Services Position System P/AR = Peak to avg (average) ratio RLMS = Return Loss Measuring Set TOPS = Traffic Operator Position System TP = Test Pad TPT = Test Progress Tone TS = Trunk Side ############# Introduction # ################################################################## The trunk maintenance process ensures that trunks are accessible to traffic function properly during call setup and termination providing a proper transmission path during the call. Trunk maintenance procedures may involve manual operations conducted from a test position as well as a fully mechanized testing. In both instances, test lines provide far end test termination functions. Therefore, all service providers shall provide terminating test line access as part of the basic plan for the overall maintenance of trunks. Terminating test lines range in complexity from those that provide the relatively complex function of recognizing and responding to specific signals. All of the terminating test lines discussed in the following clauses can be accessed (where appropriate) from the auto control devices, or manual test positions, However, features that control the utilization of test lines may be unique to each originating device. The general descriptions of the test lines included as part of this standard are operational descriptions. In no case should these operational descriptions be considered as detailed design specs. In some cases, power levels, freq's, and timing intervals are specified where they are considered to be critical to the operation of the test line. Unless otherwise indicated, timing intervals should be considered as minimums. In general, timing intervals can increase by as much as 20%. ____________________________ Test Line Naming Conventions When the North Americanm DDD (Direct Distance Dialing) Number Plan was first formed, a need was recognized for routing codes to be assigned in tandem offices to provide interoffice test line capability for trunk maintenance. The NANP has reserved 10X (X=0-9) group of codes for this purpose. This naming convention (10X) will be the standard in referencing the functions of test lines that have 10X codes assigned to them. Test lines that do not have 10X codes assigned to them will be referred by generic description (ex, synchronous line). The 10X routing codes are reserved for the terminating test lines in tandem offices. _____________________________________ Terminating Test Line Classifications Terminating test lines can be classified into three types; transmission test lines, digital loop-back test lines and operational test lines. In general, the terminating test lines have the following characteristics; Operation: Following seizure or ring-trip, off-hook supervision is normally provided unless onhook supervision is the initial condition of the test sequence. Following off hook sup(ervision), test lines that send tones provide a quiet period (300ms) to permit the single frequency (SF) signaling units to change sup status. In many cases, periods of on-hook sup are applied at timed intervals to facilitate taking down the connection once the originating end has disco'd. Most test lines can be optioned to remove tone during these periods to ensure proper SF signaling unit operation. Supervision: To provide supervision, test lines typically have supervisory control circuits that may be in the transmission path. These control circuits are designed to have a negligible effect on the transmission specifications in the voice band. Test line frequency: The stated freqs of test line tones, as stated below, includes an additional 4 Hz above the nominal freq to avoid modulation by products that may be produced in a PCM type carrier. ################################## Terminating test line definitions # ############################################# Transmission Test lines 100 type test lines are in use industry wide to facilitate connection to a termination for balance and noise testing. There are 2 general versions of the 100 type test line. The early version provides only a quiet termination for balance and noise testing. The later version, in addition to a quiet termination, also provides a 1004hz tone for one way loss measurements. Quiet Termination The quiet termination consists of 900 or 600 ohms(depending on office impedance) in series with a 2.16 microfarad capacitor. In some cases, this termiantion is built out to the nominal office capacitance with a build out capacitor. Exceptions include; In 4 wire analog offices, the quiet termination is a 4 wire 600 ohm termination. In digital offices, the office provides a termination to idle code that is the equivelant of an analog 600 ohm, 4 wire quiet termination. Some offices have 2 versions of quiet termination. The older version consists of a 900 ohm resistor in series with a 2.16mf capacitor as described above. The newer ver is more complex with 2 states, tandem and local. The tandem state provides a termination consisting of an 887 ohm resistor in series with a 2.16mf cap. In some cases, this termination may be built out to the equivelant of 400ft of office cabling(junctor grouping frame to the termination) with a build out resistor and build out cap. The local state provides complex impedance designed to simulate a typical local loop. In some cases the termination may be built out to the equivalant of 400 feet of office cable. ______________________________ 1000hz milliwatt(mw) test tone Frequency. Several versions of mw tone supplies exist. The older unmodified version provides a 100hz +/- 10hz tone, the newer, modified ver provides a 1004hz +/- 1hz tone. Level. These tones are adjusted to 0.0dBm +/- 0.03dBm(for switching offices with 0dB test access loss), 2.0dBm +/- 0.03dBm(for switching offices with 2dB test access loss), and 3.0dBm +/-0.03dBm (for switching offices with 3dB test access loss). The level of the tone is measured at the center of the switching machine - ie. at the trunk or line distro frame or at the junctor grouping frame. Impedance. The nominal impedance of the tone source is either 600 or 900 ohms, depending on the nominal impedance of the office. EXCEPTIONS. Digital Offices may provide; A 0.0dBm0, synthesized, 1004hz digital encoded signal, or, A 0.0dBm0, synthesized, 1013.8hz, 797 byte sine wave, digitally encoded reference signal (DRS) that provides a sine wave for analog testing and a specific digital sequence for bit error ratio testing(BER). Operational Parameters The minimum capabilities of the 100 type test lines provide only a quiet termination. Upon seizure of the test line, the operational sequences are as follows: Off hook (answer) supervision is returned and quiet termination is places across circuit. Some test lines return a short interval(approx 1 sec) of on-hook disconnect sup every 11secs, starting approx 11seconds after the initial connection. The preferred 100 type test lines provide a 1004hz tone followed by a quiet termination. Upon seizure of the test line the operational sequences are as follows; Offhook (answer) sup is returned. After approx 300ms delay(min 200) a 1004hz tone is applied for approx 5.5secs. After the tone is disco'd, a quiet termination is applied til the caller disco's. Certain 100 type test lines may return a 1, 2, or 3 second on-hook disconnect signal approx 11 seconds after the quiet termination has been applied. Others may return a series of 1, 2 or 3 second on hook disconnect signals approx every 30 seconds after the quiet term has ben applied. _________________________________ 101 type test line-communications The communications test line provides a circuit into a test board or test position that can be reached over any trunk incoming to the switching system served by that test position. It is used for reporting troubles and making two person manual trunk tests from test positions. _____________________________ 102 type test line -Milliwatt The milliwatt test line provides a 1004hz tone for one way loss measurements. The features of this termination are as follows. Transmission paramters; 1004hz tone Level. These tones are adjusted to 0.0dBm +/- 0.03dBm(for switching offices wiht 0-dB test access loss), 2.0dBm +/- 0.03dBm(for switching offices with 2dB test access loss), and 3.0dBm +/-0.03dBm (for switching offices with 3dB test access loss). The level of the tone is measured at the center of the switching machine. (ex, at the trunk or line distro frame or at the junctor grouping frame) Impedance. The nominal impedance of the tone source is either 600 or 900 ohms, depending on the nominal impedance of the office. EXCEPTIONS. Digital Offices may provide; A 0.0dBm0, synthesized, 1004hz digital encoded signal. Operatonal Paramters Upon seizure of the test line, the operational sequences are as follows; Off hook (answer) sup is returned. After a delay of approx 300ms a 1004hz tone is applied, note; one version may be optioned for a 175ms delay. The test line may be installed to provide, at regular intervals ranging between 9 and 12 seconds, a 1,2, or 3second interval. Note that one version may be optioned for a 2sec interuption every 2min. ____________________________________________________________ 104 type test line-transmission measuring and noise checking Transmission measuring and noise checking(test line) provides a test termination for two way transmission testing and a near end noise measurement and far end noise check. This termination may be used to test trunks from offices equipped with automatic trunk test frames. It may also be used for manual one person two way transmission measurements from a test position. The 104 type test termination; Provides test pads as required by the office in which it is located. In order to ensure consistent and symmetrical measurement when testing across network interfaces, both EX and IC tandem digital switch test lines should be arranged such that a digital reference signal is decoded to a -6dBm test level points. Provides offhook supervision. Measured the 1004h loss of the trunk from the originating end to the far end. Adjusts a transmitting(tx) pad to equal the trunk loff measured. if this loss exceeds 10db the tx'ing pad value is reduced by 10db subsequent TPT equals 225hz +/- 5hz at -10dbm +/- 0.5dbm) signal indicated this fact to the originating end. Performs two self checks to determine if the pad has been properly adjusted. In case of failure in either of these checks a repetition of the measurement is requested. Applies 1004hz test tone (0dbm) directly to the trunk to permit a rx'ing measurement at the originating end. After a timed interval, sends 1004hz test tone (0dbm) through the tx'ing pad adjusted in the fourth bullet above, preveded by a TPT signal if it had been reduced by 10 dB. The difference between the levels of the two tones rx'ed at the originating end (adjusted by 10 db if necessary) equates to the loss measured. A quit termination is provided for 5 seconds so that a noise measurement can be made at the originating end, and at the same time, a noise measurement is made at the test termination.If the noise exceeds the threshold(41 dBmC), an alternating on and off TPT disconnect signal is returned. Otherwise a steady onhook signal is returned. ___________________________________________________ 105 type test line-automatic transmission measuring The automatic tx measuring test line provides far end access to a responder and permitys 2 way loss and noise measurement to be made on trunks from a near end office equipped with a remote office test line(ROTL) and responder or other suitable control device. A number of 105 type test lines may be associated with one common responder. The test lines provide a queuing mech for callz awaiting connection to the responder. The near end ROTL and responder may be controlled by an automated test system or a manually operated ROTL unit. humph. In an integrated responder unit, the 105 type test line performs the responder functions in addition to its normal funmctions. The calls in auque are serves one at a time on a cyclical basis in the order in which they were recieved. boohyeah, as each call from a 105 type test line is connected, the test line provides the proper supervision and impedance conversion between the trunks to be tested and the responder. Queuing delay could be upto several minutes. These test lines provide indications to the responder regarding the impedance at which the measurement is to be made (600 to 900 ohms) and the test access loss to be applioed (ex, 0-, 2-, or 3-dB). In order to ensure consistent and symmetrical measurement when testing across network interfaces, both the EC and IC tandem digital switch test lines shoiuld be arranged such that a digital reference signal is decoded to a - 6- dbm test level point. When the 105 type test line is seized, an off hook sup signal (min 300ms) followed by a test progress tone is returned to the originating office. (test progress tone equals 2225hz +/- 25hz at -10dbm +/- 0.5dbm) If the responder is idle, the quieing circuit connects the test line to the responder after a min of 900ms of TPT. When the responder is attached or the control device disco's, the TPT is removed. If the responder is busy, or other test lines in queue have already been seized or both conditions apply, the TPT continues to be send back to the originating end to indicate that the call is in queue and is awaiting cut through to the responder. When the access circuit in queue has progressed to the test line under consideration, the test line is cut through and the TPT is removed. Prior to connecting to a responder, the 105type test line requires two or three timing intervals depending upon the type of trunks being served. These timing intervals are provided by a timing circuit incorporated into the test line. The first timing itnerval of 150ms is required in some offices to allow the switching sys to perform continuity tests prior to cut through. The second timing interval of 150 ms is required to allow SF signalling units to stabalize. All 105 tye test lines provide the third timing interval, which is a min 900ms. A TPT is returned to the orig end indicating that a test line has been seized. IF at the end of this third timing period, the 105 type test line has not seized a responder, the TPT remains on the line till the connecton is made or til the originating end releases the connection. After the testing sequence has been completed, the responder signals the 105 type test line to release. A just released 105 type test line remains connected to the trink till the originating trunk disco's or till the office time out feature kicks in. In end offices using 105 type test lines, the line also returns an onhookm signal to the orig office,. When the teastline has been released from the truck is restores idle state, hungry for more. Reponders. Several types of responders exist. The 51B type can be used in conjunction with the 105 type test line and is capable of making 2 way loss and noise measurements. However, these responders are no longer being manufactured. The 52 type responder provides additional testing capability as outlined below. The 56A type responder is designed for small EOs, community dial offices, and PBXens. The responder testing capabilities are as follows; 51B Type responder; Loss, C-Message noise 52 type responder; Loss, C-Message noise, C-notched noise, 3tone(gain) slope, return loss(balance), measure and terminated '3card option') 56A type Mini responder; Loss, C-message+notched noise, 3tone gain slope, balance loss, terminate only. RTTU(remote trunk test unit) responder; all 52 type capabilites. Balance measurement and termination. Remote Measurement System - Digital responder (RMS-D) Provided in digital switching offices. Updated to employ DSP tech, all 52 type capabilities included. Batteries sold seperately. Auto echo canceler tester. Note; the 56A mini responder provides an additional manual sequence in which one way(far to near) measurements of loss, gain slope, and C message noise can be made by personnel at the near end. The mini responder combines the functions of a single 105 type line and responder. ______________________________________________ 107 type test line-data transmission test line The data transmission test line provides connection to a signal source that generates test signals for one way testing of data and voice transmission parameters. The test line supplies a peak to average (P/AR) signal, gain slope freqs, quiet termination, and intermodulation distortion test signals. The test line also allows measurement of return loss, freq shift, phase jitter, C notched noise, impulse noise, gain hits, phase hits, and dropouts. x| The P/AR signal, having a spectrum similar to many high speed data sets, permits a repid check of the quality of a facility for data tx'ing. The P/AR signal is particularly sensitice to the envelope delay distortion. The 3 tone sloper freqs (1004, 404, and 2804hz) at -16dBm0 permit measurement of the trunk freq characteristic. A 1004hz -16dBm0 tone permits measurement of freq shift, phase jitter, C notched noise, impulse noise, gain hits, phase hits, and dropouts. ___________________________________ 109 Test line echo canceler testing The echo canceler test line provides loop back arrangements for in service testinf of far end echo cancelers. Upon access the test line returns offhook sup and, after a 2sec delay, returns tha 1004hz tone at -10dbm0 for approx 8sec. After an onhook flash, a connection is made to a quier termination. Measurement made at the near end with a return loss measuring set (RLMS) should indicate a very high reading for this condition. After approx 16sec another onhook flash is followed by a 16 second interval in which the trunk is looped back with no attenuation. The RLMS should show a very low reading since most echo cancelers cannot function with less then 6dB of return loss. And then, after the 3rd on hook flash, the trunk is looped through a 10dB pad for 16 seconds. The echo canceler should now function and a high level of return loss will be measured. The near end canceler has no effect on these tests and must be checked with a similar test performed with the functions reversed at the far end. At any time after the first interval of 1004 hz tone has started, a ring forward(rering) signal will cause all timing to stop in the test line. Each subsequent ring forward signal will cause the line to advance to the next state. The four stop sequence tone followed by the 3 loop back conditions is repeated till disco, wether the test line is timed or manually controlled. ____________________________ Digital loop back test lines 108 type test line - digital non inverting loop back The noninverting loop back test line provides for digital testing capabilities between digital exchange/digital PBXs or both. The digi loop back test like provides a dialable, 4 wire test line capability, which consists of circuitry that accepts and loops back recieved octets, which are re-tx'ed so that the positions of the bits within the octets are preserved. This means that the most significant bit of the re-tx'ed octet corresponds to the most significant bit of the rx'ed octet. The 108 type test line provides for a noninverting loop back test line capable of passing 64kbit/s clear signals. In this manner, all digi services(ex, 56kbit/s, 64kbit/s Restricted, and 64kbit/s Clear) can pass digi test signals through this test line. The 108 can also support loop backs for calls at any n by x DSO rate, where 1 < n < the number of channels in the primary rate(24 in the north american digital hierarchy, or 30 euro). The digital loop back test line may be integrated into the switching network(preferred implementation in a digital switching sys) or may be provided in a stand alone config similar to some existing test lines. Aswell, digitally encoded analog test signals can be passed through this test line. Refer to t1.206 for more information on this test line. ________________________________________________ 606 type test line - digital inverting loop back The digital loop back inverting test line provides operational and digi testing capability for switched digital trunks originating or terminating into 2 wire offices. This line is used for diagnostic (routine+demand) tests of digital trunks. A loop back is provided with circuitry to alter the rx'ed bit stream before transmission. The bit stream must be inverted to prevent errors due to reflections from a hybrid in the 2 wire analog switch maintenance circuit. Maintenance techs perform manual tests on digi exchange trunks in the loop back mode. A single maintenance tech can perform a loop back test by originating a data test call to the test line. The data test call number assigned is 959 6060. After the test call has been setup to this test line, the tech will use a test set to perform digital tests. No 10X code is available for this test line. ______________________ Operational Test lines 103 type test line - signal supervisory testing The signal supervisory test line provides a connection to a supervisory and signalling test circuit for overall testing of these features on inter toll trunks equipped with ring forward features that can be reached by an automatic trunk test frame or by dialing manually. The features of the 103 include; On seizure, the test line returns an off hook signal. On receipt of a ring forward signal, the test line returns an onhook signal. On receipt of a second ring forward signal, the test line returnms a 120 IPM flash. ____________________________________________ Synchronous test line - no 10X code assigned Synchronous test lines are required for offices(usually in connection with x bar offices) where ring, trip, and sup features are in the incoming trunk relay equipment. Marginal tests of the sup and trip functions are provided. Tests may be originated on either a manual or auto basis. In Stored Porgram Control(SPC) offices, an equivelant program controlled test line operation is provided to satisfy the requirements of the originating office test frames. All synchronous test lines utilize a 7 digit code to access test lines. The test line is required to perform the following functions; Tests for application of the ring signal and return audible ringing tones for approx 2 sec followed by a 3 to 4 sec silent interval. Tests for pretrip of machine ringing during silent interval. Provides a 120IPM tone till disconnect, if pretrip fails. If pass, then a test for tripping the machine ringing is performed during the same 3 to 4 sec silent interval. If the trip test fails, the 2sec audible ring and the 3 to 4 second silent interval are returned till disconnection. The pretrip and trip tests are performed in seperate silent intervals by some versions of test lines. In certain tandem versions, a single 2 second interval of TPT is applied instead of the initial 2 second 120IPM tone. When reringing successfully trips, the following supervisory tests are provided: An offhook signal of approx 1.3 secs for synchronzing with automatic progression test equipment in originating offices is returned. During the offhook period, soak current is applied to the sup circuit. Return .2 sec on hook supervision; release current is applied to sup circuit. Return .3 sec off hook sup; soak current is applied to the sup circuit. Return .2 second onhook sup; release current is applied to the sup circuit. Return .3 sec off hook sup; soak current applied to the sup circuit. Return .2 sec on hook sup; release current is applied to the sup circuit. Return 1.3 sec off hook sup; operate current is applied to the sup circuit. Return .2 sec on hook sup; an open circuit condition is present to sup circuit. Return .3 sec offhook sup; operate current is applied to the sup circuit. Return .2 sec on hook sup; an open current is applied to the sup circuit. Return .3 sec off hook sup; operate current is applied to the sup circuit. Return continuous onhook sup and provide audible signal. An audible interrupted signal may be applied at a rate of 120IPM which may consist of interrupted dial tone, test progress tone, or high tone. NOTE; one test line circuit returns off hook sup during this stage. Soem test lines provide a Centrex Treansfer test capability during this stage. _________________________________________________ Nonsynchronous test line - step by step test line A nonsynchronous test line provides an operational test which is not as complete as the sync test but can be made more rapidly. The nonsync test line is the only type required for eletromechanical offices where marginal type tests cannot be applied directly to the incoming trunk circuit, as is frequently the case with steppers. In some instances, connector test terminations can be used to apply marginal tests to such circuits as toll transmission selectors. All nonsync test lines utilize a seven digit test line code for access. The minimum requirements for non sync test lines look like this; Starts to function under the control of the ringing signal Permits the audible ringing signal to be returned for a min .5 sec to the originating office. Causes ringing to trip After the ringing has been tripped, it returns the 60 IPM line busy signal which consists of alternate .5 second off and on hook signals with low tone applied during each offhook period till it is disconnected. The nonsync test line, used in many step by step offices for the application of marginal tests when applied to connector circuits, operates in the following manner; Starts to function under the control of the ringing signal Permits the audible ringing signal to be returned for 1 to 1.5 seconds Returns an initial offhook signal of 1 to 1.5 secs during which time ringing is tripped. Provides the following sup signals sequentially after the initial off hook tests are applied; 0.5 sec onhook 1 to 1.5 sec offhook .2 sec onhook .3 sec offhook .2 sec onhook .3 sec onhook .2 sec onhook .3 second offhook A 2 second onhook period to permit disconnection from the test line. Alternate 5.5 second offhook and 2 second onhook intervals are repeated untill disconnection. The first two 5.5 second intervals are provided to facilitate testing of the ring forward(rering) and control features provided on some operator selected trunks to end offices and are desirable where these features are provided. ############################# Test connection arrangements # ################################################## This standard is based on the test connection arrangements as shown in ASCII. The matrix is utilized by reading from the originating test access to terminating test line location. Where the matrix contains dashed, the combo of originating access to terminating test lines is not within the scope of this standard. Where the matrix contains a number, that case is described with the appropriate numbering scheme for the terminating test line. These case descriptions are provided below. The intent of this standard is to describe access to termianting test lines at the first point of switching, unless otherwise indicated. CPE _________________________________ __________/ \ | / \ | [TELE]__line___(EO)_______(ECT)______(ICT)---------- | /\\ | / | / \\__(EO)__(ECT)___(OSPS) | TR/UNK \ | / | / \__|_____________/ |_________(CPE SWITCH) ################################################################################ ._______________________________________________. | Terminating Test line | TEST |_______________________________________________. CONNECTION | Customer | | MATRIX | Provided | Network Switch | | Equipment | | |____________|__________________________________| | LINE |TRUNK| EO | ECT | ICT | OSPS | IC Direct| .______________.______|_____|____|_____|_____|______|__________| O | | | | | | | | | | | R |C|L| POTS | - | 1 | 2 | - | *4 | - | - | I |P|I|_______|______|_____|____|_____|_____|_________________| G |E|N|inter | | | | | | | | IT | |E|state | - | - | 3 | - | - | - | - | NE | | |outwats| | | | | | | | AS | |_|_______|______|_____|____|_____|_____|______|__________| TT | | TRUNK | - | 1 | 2 | - | - | - | - | I |_|_________|______|_____|____|_____|_____|______|__________| N | |EO | - | 5 | 6 | 7 | 7 | 8 | - | G |NETWORK|___|______|_____|____|_____|_____|______|__________| | |ECT| - | - | 6 | 7 | 7 | 8 | - | | SWITCH|___|______|_____|____|_____|_____|______|__________| | |ICT| - | *5 | 6 | 7 | 7 | 8 | - | |_______|___|______|_____|____|_____|_____|______|__________| A |CPC | | | | | | | | | C |Direct |Line| - | - | - | - | - | - | 7 | C |Connect| | | | | | | | | E | TO |____|_____|_____|____|_____|_____|______|__________| S | IC | |_ | | | | | | | S | |Trunks|- | - | - | - | - | - | 7 | .__|_______|______|___|_____|____|_____|_____|______|__________. - = Not included in this standard * = Access may be provided beyond first point of switching. ############################# Test line access methodology # ################################################## This final section describes a test line numbering plan for cases 1 through 8, as shown in the above matrix. TO locate the appropriate test numbering plan case, use the ASCII chart by identifying the terminating test line application in the vertical column and then selecting the originating test application in the horizontal row. ex; a test connection terminating to an EO(vertical columb) and originating from an IC tandem(horizontal row) would be test numbering plan case 6. This numbering plan uses variables; T = Identifies type of test line (0-9) W = 0 or 1 Y = 8 or 9 N = 2 to 9 X = 0 to 9 D = Dunt give a fuck(filler digit) The numbering plans for these cases may contain a preferred scheme that provides a recognizable test line pattern. The pattern is based on the 10X codes associated with test lines. One objective in the standard is to allow for availability of locally assigned numbers. In those cases where the preferred and allowed schemes cannot be provided, the default option is provided.(results may vary) Operational test line access methodology The numbering plans for synchronous end office test #s, synchronous IC and EC tandem test numbers, and nonsynchronous(SXS type) are outlined below; Synchronous EO test # NXX-XXXX Synchronout IC and EC tandem test numbers are 959-1530 or 96Y-XXXX. The non synchronous(SXS) type is numbered NXX-XXXX. ______ Case 1 Applies CPE line or trunk access to CPE terminating test lines: NXX-X10T Preferred NXX-XX0T Allowed NXX-XXXX Default ______ Case 2 Applies to CPE line or trunk access to EO terminating test lines: NXX-X10T Preferred NXX-XXXX Allowed ______ Case 3 Applies to interstate outwats line access to serving EO terminating test lines: 95Y-X10T Preferred 95Y-XXXX Allowed ______ Case 4 Applies to CPE line access to an ICT. This case provides for a built up connection from a subscriber line through an end office, either through an EC access tandem to the IC switch, or direct from the EO to the IC switch. 700-95Y-10TD Preferred 700 95Y-11WT ______ Case 5 Applies to an EC end office or ICT to CPE trunk. The NXX and thousands digit are those assigned for normal traffic. NXX-X10T Preferred NXX-XX0T Allowed NXX-XXX Default ______ Case 6 Applies to an originating network switch, terminating to an EO. This case is intended for intraLATA connections, where no intermediate switch is involded in the connection. NXX-X10T Preferred NXX-XX0T Allowed NXX-XXX Default ______ Case 7 Applies to an originating network switch, terminating to an EC or IC tandem. (EO to IC tandem is via direct trunking, not EC tandem) 10T Preferred 95Y-10TD Allowed 95Y-11WT Allowed Note; the 10T code has traditionally been used to route a call in a combined local tandem office to the tandem test line termination. If the 7 digit code is used for this purpose, different numbers must be used to differentiate between local and tandem terminations. ______ Case 8 Applies to a network terminating to OSPS/TOPS 95Y-12TD Note; The 95Y dialing code as outlined is restricted to interstate outwats lines in end offices only. ############ Bibliography# ################################################################### T1.206-1994, Telecommunications - Digital exchanges and PBXs - Digital circuit loop back test line with N x DS0 capability ANSI/IEEE 743-1995 Standard Equipment requirements and measurement techniques for analog transmission parameters for telecommunications TR-NPL-000175, Compatibility Information for Feature Group B Switched Access Service, Issue 1, Bell Communications Research, Inc. July 1985 TR-NPL-000258, Compatibility Information for Feature Group D Switched Access Service, Issue 1, Bell Communications Research, Inc October 1985 SR--2275, Bellcore Notes on the Network, Issue 3, Bell Communications Research, # Inc. Dec 1997 # ################################################################################