Comdial Dxp Plus Instructions Manual
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4.4 Requesting Information On Switch Settings You can determine how particular DIP switches on the DXPT1 board are set by using one of the following requests. Depending on which request you make, the system supplies you with the following information: ·DIP switch settings for SW1, ·DIP switch settings for SW2, ·DIP switch settings for LIU. 4.4.1 Requesting Information On DIP Switch Settings Set the diagnostic DIP switches as shown in the following table. Switch 1 is the top switch. When the switch is moved to the right, it is turned on. The hex code shown is used for remote operation only. SWITCH SETTINGS TYPE OF REQUEST HEX CODE 12345678 Provide the DIP switch settings for SW1 Provide the DIP switch settings for SW1 Provide the DIP switch settings for LIU Provide the DIP switch settings for the diagnostic switches (the diagnostic LEDs simply “mirror” the switch settings; that is, LEDs 5 and 8 should be lit).01 03 07 09 OFF OFF OFF OFFOFF OFF OFF OFFOFF OFF OFF OFFOFF OFFO OFF OFFOFF OFF OFF ONOFF OFF ON OFFOFF ON ON OFFON ON ON ON 4.4.2 Reading The DIP Switch Settings Information From The LEDs The diagnostic LEDs “mirror” the switch settings for the DIP switches requested. For example, if LED 1 is on, then switch 1 is on for the requested DIP switches. If LED 1 is off, then switch 1 is off, and so forth. When requesting information on the LIU DIP switch settings, the system replies via LEDs 1 through 4. LEDs 5 through 8 are not used in this application. IMI89–207 Troubleshooting The DXPT1 Installation 16 – Troubleshooting The DXPT1 Installation
4.5 Requesting AB Signalling When you use this request, you are asking the system to reveal the A and B bits. Upon making the AB signalling request, the system supplies you with the following information: ·A bit transmitted to the CO, ·B bit transmitted to the CO, ·A bit received from the CO, ·B bit received from the CO. 4.5.1 Setting The DIP Switches To Request AB Signalling Set the DIP switches as shown in the following table. Switch 1 is the top switch. When the switch is moved to the right, it is turned on. Use switches 4 through 8 (designated in the table by A through E) to select the channel you want to test (1 through 24). See the table in section 4.1.1 for the relationship between the 24 different letter groups and channel numbers. For remote operation, determine the corresponding hex code from Table 1. SWITCH SETTINGS TYPE OF REQUEST HEX CODE 12345678 Provide AB signalling on the channel designated by ABCDE. See section 4.1.1.see Table 1 OFF OFF ON A B C D E 4.5.2 Reading The AB Signalling Information From The LEDs The Table below shows samples of the AB signalling information that is revealed by the LEDs. LEDs 5 through 8 are off. LED 1 is at the top. LEDs LED DEFINITIONS HEX CODE 12345678 ON OFF OFF OFFOFF ON OFF OFFOFF OFF ON OFFOFF OFF OFF ONLEDs 5-8 are off Transmitting A bit to central office Transmitting B bit to central office Receiving A bit from central office Receiving B bit from central office80 40 20 10 Troubleshooting The DXPT1 Installation IMI89–207 Throubleshooting The DXPT1 Installation – 17
4.6 Requesting Information On Trunk Assignments Make this request to receive information on the trunk assignments that have been made. Upon making this request, the system provides you with the following information: ·trunk type (ground start, DID, E&M, or loop start), ·dial type (rotary or tone), ·signalling protocol (immediate, wink, delay). 4.6.1 Setting The DIP Switches For Requesting Trunk Assignment Information Set the DIP switches as shown in the following table to request trunk assignment information. Use switches 4 through 8 (designated in the table by A through E) to select the channel you want to test (1 through 24). See the table in section 4.1.1 for the relationship between the 24 different letter groups and channel numbers. For remote operation, determine the corresponding hex code from Table 1. Switch 1 is the top switch. SWITCH SETTINGS TYPE OF REQUEST HEX CODE 12345678Provide information about trunk assignments on the channel specified by the letters ABCDE (see the table in section 4.1.1).see Table 1 ON OFF ON A B C D E 4.6.2 Reading The Trunk Assignment Information From The LEDs The Table below shows the trunk assignment information that is revealed by the LEDs. LED 1 is at the top. LEDs LED DEFINITIONS 12345678 ON ON OFF OFF OFFOFF ON ON OFF OFFOFF OFF OFF ON OFFOFF OFF OFF OFF OFFON OFFOFF OFFOFF OFF ON ON OFFOFF ON OFF ON OFFGround start DID E&M Loop start Tone dial Not used Wink start Delay start Immediate start Not used No trunk assignments made IMI89–207 Troubleshooting The DXPT1 Installation 18 – Troubleshooting The DXPT1 Installation
4.7 Requesting Information About Channel State Use this request to determine the state of the channel specified in the request command. Upon making this request, the system provides you with the following information: ·channel state (idle or busy). 4.7.1 Setting The DIP Switches For Requesting Channel State Information Set the DIP switches as shown in the following table to request the state of the channel specified in the request command. Use switches 4 through 8 (designated in the table by A through E) to select the desired channel.(1 through 24). See the table in section 4.1.1 for the relationship between the 24 different letter groups and channel numbers. For remote operation, determine the corresponding hex code from Table 1. Switch 1 is the top switch. SWITCH SETTINGS TYPE OF REQUEST HEX CODE 12345678Provide information about the state of the channel specified by the letters ABCDE (see the table in section 4.1.1).see Table 1 ON ON OFF A B C D E 4.7.2 Reading The Channel State Information From The LEDs The Table below shows the channel state information that is revealed by the LEDs. LED 1 is at the top. LEDs LED DEFINITIONSHEX CODE 12345678 OFF OFF OFF OFF OFF OFF ON ON The selected channel is in the idle state. 03 Troubleshooting The DXPT1 Installation IMI89–207 Throubleshooting The DXPT1 Installation – 19
4.8 Using The Hexadecimal Codes For Remote Diagnostics You can similate the diagnostic DIP switch settings, that are usually made on-site, by sending the following code sequence via modem to the remote DXPT1 board: tkmsg(valid port number)7B,(hex code) The hexadecimal value that you use for the field code corresponds to a bit pattern that you are using to similate DIP switch settings. For example, to similate a switch setting of 11100001 (switches 1, 2, 3, and 8 on) use hex code E1 in the field position. (Switch 1 is the top switch as you look at the front edge of the DXPT1 board. The switches are “on” when you move them to the right.). After you have interrogated the DXPT1 board by transmitting a valid diagnostic code to it, the DXPT1 responds with a hex code that similarily represents a bit pattern that you can find in Table 1. This bit pattern represents the diagnostic LEDs located adjacent to the DIP switches on the DXPT1 board. For example, let’s assume you received the hex code 53 in response to a request for cold start information. Since 53 (hex) represents a bit pattern of 01010011, it follows that LEDs 2, 4, 7, and 8 are lit. (LED 1 is the top LED in the group of eight on the DXPT1 board.) See the example in section 4.2.2. Table 1. Hexadecimal Codes Related To Bit Patterns Bit Pattern Hex CodeBit Pattern Hex CodeBit Pattern Hex CodeBit Pattern Hex Code 12345678 12345678 12345678 12345678 00000000 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 00001001 00001010 00001011 00001100 00001101 00001110 00001111 00010000 00010001 00010010 00010011 00010100 00010101 00010110 00010111 00011000 00011001 00011010 00011011 00011100 00011101 00011110 00011111 00100000 00100001 00100010 00100011 00100100 00100101 00100110 00100111 00101000 00101001 00101010 00101011 00101100 00101101 00101110 00101111 00110000 00110001 00110010 00110011 00110100 00110101 00110110 00110111 00111000 00111001 00111010 00111011 00111100 00111101 00111110 0011111100 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F01000000 01000001 01000010 01000011 01000100 01000101 01000110 01000111 01001000 01001001 01001010 01001011 01001100 01001101 01001110 01001111 01010000 01010001 01010010 01010011 01010100 01010101 01010110 01010111 01011000 01011001 01011010 01011011 01011100 01011101 01011110 01011111 01100000 01100001 01100010 01100011 01100100 01100101 01100110 01100111 01101000 01101001 01101010 01101011 01101100 01101101 01101110 01101111 01110000 01110001 01110010 01110011 01110100 01110101 01110110 01110111 01111000 01111001 01111010 01111011 01111100 01111101 01111110 0111111140 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F10000000 10000001 10000010 10000011 10000100 10000101 10000110 10000111 10001000 10001001 10001010 10001011 10001100 10001101 10001110 10001111 10010000 10010001 10010010 10010011 10010100 10010101 10010110 10010111 10011000 10011001 10011010 10011011 10011100 10011101 10011110 10011111 10100000 10100001 10100010 10100011 10100100 10100101 10100110 10100111 10101000 10101001 10101010 10101011 10101100 10101101 10101110 10101111 10110000 10110001 10110010 10110011 10110100 10110101 10110110 10110111 10111000 10111001 10111010 10111011 10111100 10111101 10111110 1011111180 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF11000000 11000001 11000010 11000011 11000100 11000101 11000110 11000111 11001000 11001001 11001010 11001011 11001100 11001101 11001110 11001111 11010000 11010001 11010010 11010011 11010100 11010101 11010110 11010111 11011000 11011001 11011010 11011011 11011100 11011101 11011110 11011111 11100000 11100001 11100010 11100011 11100100 11100101 11100110 11100111 11101000 11101001 11101010 11101011 11101100 11101101 11101110 11101111 11110000 11110001 11110010 11110011 11110100 11110101 11110110 11110111 11111000 11111001 11111010 11111011 11111100 11111101 11111110 11111111C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF IMI89–207 Troubleshooting The DXPT1 Installation 20 – Troubleshooting The DXPT1 Installation
5 Selecting The T1 PAD Settings The system pad settings that you select through the DXPPlussystem programming are very important for the correct audio level to be transmitted and received and for echo suppression. 5.1 Setting T1 Transmit Level For the older software, set tonormal(uses low, very-low, normal, high, very-high settings). For software using Gain1, Gain2, Nominal, Loss1, Loss2, Loss3, Loss4, and Loss5, useNominalsetting. 5.2 Setting T1 Receive Level For the older software, set to Very-Low. For the Loss/Gain software, set to Loss4. If echo problems occur, try Loss5. 6 Solving T1 Problems See the following table for T1 problems you could encounter and their possible causes. PROBLEM POSSIBLE CAUSE Signalling bits are not being received properly (no seize) or the network is not “seeing” the seize. When the T1 option is installed in a DXP system, the DXP shows massive seizes on the inbound channels. The DXPT1 is seizing outward A=1 and B=1 and channel is in the idle state. The SIG red LED on the DXPT1 board is lit indicating no receive signal. Bipolar alarms are indicated when T1 option is first installed. The SLIP red LED on the DXPT1 board is lit indicating frame slips are occurring. Echos are heard.Associated multiplexer (mux) equipment may be defective if installed between the DXP and the central office (CO). Incorrect trunk assignments. For example, ground start idle bits will cause seizes on DID and E&M trunk assignments. Channel not assigned and not disabled. All LEDs will be off upon making a request for trunk assignment information (see section 4.6.2). - If new install, cabling may be reversed. - Wiring to DXPT1 board may be defective - DXPT1 board may be defective. Verify by installing local loopback. - Only one receive wire connected. Check cable. - Noise sources or lightning. DXOPT-SYN card may not be locked. There should not be any red LEDs on this card lit. Verify presence of primary or secondary sources by the green LEDs lit on this card. - Two- to four-wire hybrid conversions have been made. Cut in echo suppressors to eliminate echos on calls over 600 miles and inform the network. - Pad setting may be incorrect causing acoustical feedback (see section 5, PAD Settings). 0 dB (or -3 dB) is recommended for transmitted data and -9 dB at an industry standard telephone (IST). Troubleshooting The DXPT1 Installation IMI89–207 Throubleshooting The DXPT1 Installation – 21
A. Appendix A Appendix A consists of two tables showing superframe and extended superframe format. The information for these tables is from the American National Standards Institute (ANSI) specification T1.403-1989. Table 2. Superframe Format Bit Use In Each signalling Bit F Bits Time Slot Use Options Frame Number Bit Term Signal Traffic SignalT T signalling Number Frame Frame Channel (F 1)(F2) 1 0 1 — 1-8 — — — 2 193 — 0 1-8 — — — 3 386 0 — 1-8 — — — 4 579 — 0 1-8 — — — 5 772 1 — 1-8 — — — 6 965 — 1 1-7 8 — A 7 1158 0 — 1-8 — — — 8 1351 — 1 1-8 — — — 9 1544 1 — 1-8 — — — 10 1737 — 1 1-8 — — — 11 1930 0 — 1-8 — — — 12 2123 — 0 1-7 8 — B NOTES: (1) Frame 1 transmitted first. (2) Frames 6 and 12 are denoted signalling frames. (3) Option T- Traffic (bit 8 not used for robbed-bit signalling). IMI89–207 Troubleshooting The DXPT1 Installation 22 – Troubleshooting The DXPT1 Installation
Table 3. Extended Superframe Format Bit Use In Each signalling Bit F Bits Time Slot Use Options Frame Number Bit FPS DL CRC Traffic Signal T 2 4 16 Number 1 0 — m — 1-8 — — — — — 2 193 — — C 11-8 — — — — — 3 386 — m — 1-8 — — — — — 4 579 0 — — 1-8 — — — — — 5 772 — m — 1-8 — — — — — 6 965 — — C 21-7 8 — A A A 7 1158 — m — 1-8 — — — — — 8 1351 0 — — 1-8 — — — — — 9 1544 — m — 1-8 — — — — — 10 1737 — — C 31-8 — — — — — 11 1930 — m — 1-8 — — — — — 12 2123 1 — — 1-7 8 — A B B 13 2316 — m — 1-8 — — — — — 14 2509 — — C 41-8 — — — — — 15 2702 — m — 1-8 — — — — — 16 2895 0 — — 1-8 — — — — — 17 3088 — m — 1-8 — — — — — 18 3281 — — C 51-7 8 — A A C 19 3474 — m — 1-8 — — — — — 20 3667 1 — — 1-8 — — — — — 21 3860 — m — 1-8 — — — — — 22 4053 — — C 61-8 — — — — — 23 4246 — m — 1-8 — — — — — 24 4439 1 — — 1-7 8 — A B D NOTES: (1) Frame 1 transmitted first. (2) Frames 6, 12, 18, and 24 are denoted signalling frames. (3) FPS = Framing Pattern Sequence (...001011...) (4) DL = 4KBits/s Data Link (Message Bits m) (5) CRC - CRC6 Cyclic Redundancy Check (Bits C1-C6) (6) Option T = Traffic (Bit 8 not used for Robbed-Bit signalling) (7) Option 2 = 2-State signalling (Channel A) (8) Option 4 = 4-State signalling (Channels A and B) (9) Option 16 = 16-State signalling (Channels A, B, C, and D) Troubleshooting The DXPT1 Installation IMI89–207 Throubleshooting The DXPT1 Installation – 23
Understanding The System Diagnostics for the DXP Plus Digital Communications System 1.0 Introducing System Diagnostics The digital communications system provides you with the option of doing several different types of diagnostic checks on the system. This publication details the types of diagnostics and their functions. NOTE: You should perform all diagnostic tests on an idle system and under the direction of a Comdial technician. A busy system could produce invalid test results. Because there are numerous items that could contribute to a failure of any of these tests, Comdial assistance is required in interpreting the results of the diagnostic tests. R This manual has been developed by Comdial Corporation (the “Company”) and is intended for the use of its customers and service personnel. The information in this manual is subject to change without notice. While every effort has been made to eliminate errors, the Company disclaims liability for any difficulties arising from the interpretation of the information contained herein. The information contained herein does not purport to cover all details or variations in equipment or to provide for every possible contingency to be met in connection with installation, operation, or maintenance. Should further information be desired, or should particular problems arise which are not covered sufficiently for the purchaser’s purposes, contact Comdial, Inside Sales Department, Charlottesville, Virginia 22906. Printed in U.S.A.IMI89–239.01 5/96 sPUSHPOWERONOFFCONT BRIGHT Diagnostics 1. Initialize Diagnostic Data 2. ROM Checksum Verification 3. Scratch RAM Test 4. Non-Volatile RAM Test 5. Time Switch Memory Test 6. Main Cabinet DTMF Receiver Test 7. Expansion II Cabinet DTMF Receiver Test 8. Expansion III Cabinet DTMF Receiver Test 9. AUX. Board DTMF Receiver Test 10. Speaker Coefficients 11. CPU Board Dip Switches Viewing The Diagnostics Screen
2.0 Defining System Diagnostics 2.1 Initialize Diagnostic Data This option clears all previous diagnostic test results from memory. 2.2 ROM Checksum Verification The ROM checksum test calculates and displays a checksum to test the integrity of the system software builds (located in the flash ROM). If the system passes the test, it displaysPassedon the screen. If the system fails the test, it displaysFailed along with the expected and actual checksum value. 2.3 Scratch RAM Test This test checks the integrity of the scratch RAM area by writing and reading words in memory. The test works by writing a known pattern, “55AA” into memory and then reading the area of memory back. The system then writes and reads a second known pattern, “AA55.” This algorithm checks every byte in the the scratch RAM area. If an error occurs, the system displays a message stating that the test failed. Scratch RAM is considered the working area of memory for the DXP’s microprocessor. This area of memory is “volatile,” which means that any data in this area is lost when the system loses power. 2.4 NonVolatile RAM test This test checks the integrity of the NOV-RAM area of memory. The NOV-RAM area of memory is write protected and backed up by super capacitors on the DXP’s memory board. The programmed database and SMDRs are stored in this area of memory. This test uses the same write/read algorithm that the scratch RAM test employs. 2.5 Time Switch Memory Test This test checks all 560 timeslots with a write/read algorithm pattern similar to that of the scratch/NOV-RAM test. All voice, data, and tones that pass into and out of the DXP pass through the timeswitch. IMI89–239 Understanding The System Diagnostics 2– Understanding The System Diagnostics