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Northern Telecom QCA146 Installation And Testing Instructions

2-mb/s remote peripheral equipment cabinet and shelf
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SL-1
2-Mb/s Remote Peripheral Equipment
QCA146 cabinet and QSD74 shelf installation and testing
Publication number: Appendix 1 to 553-2741-200
Document release: Group F
Document status: Standard
Date: 90 11 02
© 1987 Northern Telecom
All rights reserved.
NT, Meridian 1, Meridian and SL-1 are trademarks of Northern Telecom.
Title to and ownership of SL-1 software shall at all times remain with Northern Telecom. SL-1
software shall not be sold outright and the use thereof by the customer shall be subject to the
parties entering into agreement as specified by Northern Telecom.
Information contained in this document is subject to change. Northern Telecom reserves the
right, without notice, to make changes in equipment or program components as progress in
engineering, manufacturing, or technology may warrant.
2-Mb/s Remote Peripheral Equipment
Appendix 1 to 553-2741-200

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  • Page 1 SL-1 2-Mb/s Remote Peripheral Equipment QCA146 cabinet and QSD74 shelf installation and testing Publication number: Appendix 1 to 553-2741-200 Document release: Group F Document status: Standard Date: 90 11 02 © 1987 Northern Telecom All rights reserved. NT, Meridian 1, Meridian and SL-1 are trademarks of Northern Telecom.

  • Page 2: Reason For Revision

    Reason for revision 90 11 02 Changes have been made to add references to publication 553-2931-200 for Generic X11 Supplementary Features (Phase 6) Remote Perpheral Equipment and include miscellaneous updates. 2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-200...

  • Page 3: Table Of Contents

    Contents General Description QCA146 RPE cabinet Expansion shelves QSD74 RPE shelf QSD66 PE expansion shelf Loop assignment Spare loop Bus terminating units Network extender Other circuit packs Power converters AC power line cords Reserve batteries Cooling units Environment Grounding Installation...

  • Page 4: General

    1-1 of 1 page General This Appendix describes the installation, connections and testing of Remote Peripheral Equipment (RPE) installed in a QCA146 RPE cabinet and in a QSD74 RPE shelf mounted in a cabinet either at the remote end or the local end.

  • Page 5: Description

    Expansion shelves QSD74 RPE shelf The QSD74 RPE shelf assembly can be mounted in a QCA146 RPE cabinet at the remote location when additional loops are required. The shelf is designed to contain all the RPE related circuit packs required to operate three network loops.

  • Page 6: Loop Assignment

    Bus terminating units Each QSD74 RPE shelf requires three Bus Terminating Units (BTUs). When used in a QCA146 cabinet (remote end), three QPC477A23 BTUs are required. When used in a QCA136 or QCA141 CE cabinet (local end), three QPC477A24 BTU are required.

  • Page 7: Network Extender

    13 of the QSD74 shelf when it is mounted in a QCA136 or QCA141 CE cabinet. AC power line cords Three commercial power line cords can be used with the QCA146 RPE cabinet. (a) A QCAD273 line cord is used when a 115 V 15A power supply is provided.

  • Page 8: Reserve Batteries

    QCA146 RPE cabinet. Grounding The QCA146 RPE cabinet must be connected to a suitable building ground to ensure proper operation of the RPE equipment. Refer to 553- YYY1-200 for a description of suitable building grounds.
  • Page 9 Figure 2-1 Front view of typical CE cabinet Peripheral Equipment Remote Peripheral Equipment QSD74 RPE Shelf 1 2 3 4 5 6 7 8 9 10 1 1 12 13 QPC190, QPC355 or QPC691 5/12V Converter Common Equipment QUAA3 Power Unit (Ill.5531273) Peripheral Equipment Shelf Position 4...

  • Page 10: Installation

    Installation Procedures Chart 3-1 describes the procedures to follow when installing a QCA146 RPE cabinet. Chart 3-2 describes the procedures to follow when installing an additional QSD66 PE or QSD74 RPE shelf assembly in an existing QCA146 RPE cabinet. Chart 3-3 describes the procedures to follow when installing a QBL24 Battery Unit.
  • Page 11 Installation Chart 3-1 QCA146 RPE cabinet installation Step 2-Mb/s Remote Peripheral Equipment P r o c e d u r e Transport the cabinet as close as possible to its final location. Transport the remaining equipment to a convenient safe dry location.
  • Page 12 Installation Measure the resistance between the system ground wire and the ground lug at the rear of the cabinet (Figure 2-1). If the resistance is greater than 5 , check the building ground and ac panel connections. —continued— 2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-200...
  • Page 13 Installation Chart 3-1 (continued) QCA146 RPE cabinet installation Step 2-Mb/s Remote Peripheral Equipment P r o c e d u r e Disconnect the power line cord from the commercial ac power supply. Connect the 6 AWG building ground wire to the ground lug identified by a ground symbol at the rear of the cabinet (Figure 2-1).
  • Page 14 Installation the RPE shelf. At the remote end, QPC477A23 BTU are installed from the front of the RPE shelf in the connectors located between positions 3 and 4, 6 and 7, 9 and 10. —continued— 2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-200...
  • Page 15 Installation Chart 3-1 (continued) QCA146 RPE cabinet installation Step 2-Mb/s Remote Peripheral Equipment P r o c e d u r e Connect ac power line cord to commercial ac power supply. Set all breakers at the front of the cabinet to ON.
  • Page 16 Figure 3-1 Ground connection and tests Shelf Position 1 Power Cord Long L- Or U-Shaped Prong On Power Cord Connector (Ill553-1134) Power Connector QRF1 Rectifi Rear View of Cabinet AC Power Ground Resistance 0 Take This Reading First With System Ground Wire Disconnected 2-Mb/s Remote Peripheral Equipment Installation...
  • Page 17 Installation F i g u r e 3 - 2 Typical terminal block layout 2-Mb/s Remote Peripheral Equipment BIX Blocks For First Expansion BIX Blocks PE Shelf For Base Cabinet Cable A Cable A Cable B Cable B To PE Shelf To PE Shelf Cable C Position 2...
  • Page 18 Installation F i g u r e 3 - 3 Connector layout rear of cabinet (see next page) 2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-200...
  • Page 19 3-10 Installation PE Cable Connectors Shelf Backplane PE Cable Connectors Shelf Backplane PE Cable Connectors Shelf Backplane PE Cable Connectors (Ill553-1275) 2-Mb/s Remote Peripheral Equipment Cabinet Top Assembly Power Connectors Shelf Position 5 Power Connectors Shelf Position 3 Power Shelf Connector Position 1 Power Equipment...
  • Page 20 F i g u r e 3 - 4 Connections at rear of RPE shelf -52 V Power Connector (Note 2) Connector for Cable to Extend Customer Defined Alarms (not used at local end) Notes Loop 1 connects to terminals G1-RX and G2-TX. Loop 2 connects to terminals G3-RX and G4-TX.
  • Page 21 3-12 Installation F i g u r e 3 - 5 Front view of RPE cabinet Opening In Spacer Bar For Routing Cables Place Cables In Grooves In Spacer Bar Or Secure To Bar With Cable Ties Cable Routing QPC769 Net Ext (Note) Note: Connect loop cables from connector LP1 (first loop), LP2 (second loop), or LPS (when assigned as an active third loop and not a spare loop) to connector LPX on peripheral buffer pack.
  • Page 22 T a b l e 3 - A Peripheral equipment cable terminating sequence PE CABLE FROM CONNECTOR PAIR PIN PAIR DUAL SINGLE COLOR LOOP LOOP MODE MODE W-BL BL-W W-BR BR-W R-BL BL-R R-BR BR-R BK-BL BL-BK BK-O O-BK BK-G G-BK BK-BR BR-BK...
  • Page 23 3-14 Installation Table 3-A (continued) Peripheral equipment cable terminating sequence PAIR PIN (Ill553-1146b) 2-Mb/s Remote Peripheral Equipment PE CABLE FROM CONNECTOR TERMINAL NUMBER (TN) PAIR DUAL SINGLE 16 UNITS COLOR LOOP LOOP MODE MODE CARD W-BL UNIT BL-W UNIT UNIT W-BR UNIT BR-W...
  • Page 24 3-16 Installation Table 3-A (continued) Peripheral equipment cable terminating sequence PAIR PIN Notes: 1. Card number 5 (slot 5 in PE shelf) cannot be assigned on shelves equipped with only eight PE slots. 2.The transfer lead (BR-V) is provided only on PE shelves equipped with a maximum of eight slots and connects to the PE SHELF TRANSFER lead (W-O) of the QUA6 power fail transfer unit serving trunks on this shelf (if equipped).
  • Page 25 Table 3-A (continued) Peripheral equipment cable terminating sequence PE CABLE FROM CONNECTOR TERMINAL NUMBER (TN) PAIR PIN PAIR DUAL SINGLE 16 UNITS COLOR LOOP LOOP MODE MODE W-BL BL-W W-BR BR-W R-BL BL-R (Note) R-BR BR-R BK-BL BL-BK BK-O O-BK BK-G G-BK BK-BR...
  • Page 26 Table 3-A (continued) Peripheral equipment cable terminating sequence PE CABLE FROM CONNECTOR TERMINAL NUMBER (TN) PAIR PIN PAIR DUAL SINGLE COLOR LOOP LOOP MODE MODE W-BL BL-W W-BR BR-W R-BL BL-R R-BR BR-R BK-BL BL-BK BK-O O-BK BK-G G-BK BK-BR BR-BK BK-S S-BK...
  • Page 27 3-20 Installation Table 3-A (continued) Peripheral equipment cable terminating sequence PAIR PIN (221606f) (Ill553-1146f) 2-Mb/s Remote Peripheral Equipment PE CABLE FROM CONNECTOR TERMINAL NUMBER (TN) PAIR DUAL SINGLE 16 UNITS COLOR LOOP LOOP MODE MODE CARD UNIT W-BL BL-W UNIT UNIT W-BR UNIT...
  • Page 28 Table 3-A (continued) Peripheral equipment cable terminating sequence PE CABLE FROM CONNECTOR PAIR PIN PAIR DUAL SINGLE COLOR LOOP LOOP MODE MODE W-BL BL-W W-BR BR-W R-BL BL-R X-10 R-BR BR-R BK-BL BL-BK BK-O (Note) O-BK BK-G G-BK BK-BR BR-BK BK-S S-BK Y-BL...
  • Page 29 3-22 Installation C h a r t 3 - 2 QSD66 or QSD74 expansion in a QCA146 RPE cabinet Step 2-Mb/s Remote Peripheral Equipment P r o c e d u r e Remove screws securing front and rear cabinet covers.
  • Page 30 Chart 3-2 (continued) QSD66 or QSD74 expansion in a QCA146 RPE cabinet Step P r o c e d u r e Set the new shelf on top of the existing shelf with both ends overlapping the joiner plates.
  • Page 31 3-24 Installation Chart 3-2 (continued) QSD66 or QSD74 expansion in a QCA146 RPE cabinet Step 2-Mb/s Remote Peripheral Equipment Connect power connector from QCAD276 or QCAD277 power cable to connector J on the shelf backplane according to shelf position in the cabinet (Figure 2-3).
  • Page 32 If not previously connected, connect the other end of the power cable as follows: a) QCAD276 power cable. • Connector P3 to J3 at the rear of the QUAA3 power unit. • Black leads equipped with ring connections to the GRD2 lug on the ground bus near the rear of the QUAA3 unit.
  • Page 33 3-26 Installation Chart 3-2 (continued) QSD66 or QSD74 expansion in a QCA146 RPE cabinet Step 2-Mb/s Remote Peripheral Equipment —continued— P r o c e d u r e If QUD24 cooling units are required, install as described in Chart 2-6. If cooling units are not required, reinstall the louvered top assembly on top of the new shelf and secure with six screws through the top.
  • Page 34 Install NE-A25B-type cables from connectors A, B, C, D, E, and F on the shelf backplane to the cross-connect terminal. Cable terminating sequence is shown in Table 2-A. Set the input breakers for the new shelf to ON. Note: The designations on the QUX20 power unit correspond to connectors PE2 through PE5 on the QCAD276 and QCAD277 power cables.
  • Page 35 3-28 Installation F i g u r e 3 - 6 Shelf assembly Screws Thermostat Cut-Out Additional For Network Third Cables Shelf Additional Joiner Plate Second Shelf Spacer Cut-Out For Network Cables Base Cabinet (RPE Shelf, One Peripheral Equipment Shelf and Power Equipment) Front View Of Cabinet (Ill.553-1271)
  • Page 36 C h a r t 3 - 3 QBL24 battery unit installation (main unit) When adding batteries to a cabinet ensure that the cabinet is connected to a 220 V 20A or 110 V 30A ac power supply. Service is interrupted when adding batteries to an opening cabinet.
  • Page 37 3-30 Installation WARNING: The battery cells are capable of delivering high currents when externally short-circuited. Caution must be used when working near the open terminals of the batteries to ensure that the terminals are not inadvertently short-circuited. —continued— 2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-200...
  • Page 38 Chart 3-3 (continued) QBL24 battery unit installation (main unit) Step P r o c e d u r e With the three black jumper wires supplied with batteries, connect the four battery packs in series as shown in Figure 2-7. Connect the large lug of the black to the large terminal (+) on the first battery pack.
  • Page 39 3-32 Installation Chart 3-3 (continued) QBL24 battery unit installation (main unit) Step 2-Mb/s Remote Peripheral Equipment P r o c e d u r e Connect the power and control wiring from the QBL24 unit as follows (Figure 2-8): • Connect the long black wires (designated 1 and 2) to terminals 1 and 2 of TB3 at the rear of the rectifier.
  • Page 40 Installation 3-33 With a volt meter, measure the voltage at the test points located on the front of the QBL24 battery unit. If required, adjust the voltage by turning the VOLT ADJ screw on the rectifier until a reading of -53.60 V is attained. —continued—...
  • Page 41 3-34 Installation Chart 3-3 (continued) QBL24 battery unit installation (main unit) Step 2-Mb/s Remote Peripheral Equipment P r o c e d u r e Set breakers to ON in the following order: DCBRKR breaker on the front of the QBL24 unit (and expansion unit if equipped).
  • Page 42 C h a r t 3 - 4 Expansion QBL24 battery unit installation Step P r o c e d u r e Set the breaker on the front of the QBL24 unit to OFF. Remove cover from the QBL24 unit by loosening the captive screws on top of the unit.
  • Page 43 3-36 Installation Remove cover from top of the main QBL24 battery unit. —continued— 2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-200...
  • Page 44 C h a r t 3 - 4 ( c o n t i n u e d ) Expansion QBL24 battery unit installation Step P r o c e d u r e Remove plug from top hole on the right side of the main QBL24 battery unit (Figure 2-9) Remove lock nut from the 90°...
  • Page 45 3-38 Installation Note: Check wiring and polarity of batteries if DC BRKR breaker on the QBL24 battery unit trips. d) Set the CAB INP breaker on the QUX19 unit to ON. —continued— 2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-200...
  • Page 46 C h a r t 3 - 4 ( c o n t i n u e d ) Expansion QBL24 battery unit installation Step P r o c e d u r e If required, install cabinet covers. Connect wiring from expansion QBL24 battery unit to the main QBL24 unit as follows (Figure 2-9): •...
  • Page 47 3-40 Installation If required, install cabinet covers. 2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-200...
  • Page 48 F i g u r e 3 - 7 Battery cell connections Front Of QBL24 Unit Black Wire To QBL24 Unit Red Wire To QBL24 Unit Battery Packs Flexible Conduit For Power And Control Wiring (Ill553-1136) Battery Packs Top View Of QBL24 Battery Unit 2-Mb/s Remote Peripheral Equipment Installation Black...

  • Page 49: Reserve Power Supply Connections

    3-42 Installation F i g u r e 3 - 8 Reserve power supply connections Wires 1 And 2 From Battery Unit Long Red and Black Straps For Batteryless Operation Only (Store Straps With Screws Provided When Not in Use) Black White Place Wiring...
  • Page 50 F i g u r e 3 - 9 Expansion battery unit connections Black Wire Green Wire Inside View Of Front Panel QCAD301 Cable From Expansion QBL24 Unit BRKR BATT UN 54V/30A Connects To Cabinet (Ill553-1138) Shield Expansion QBL24 Red Wire Main QBL24 Battery Unit Remove Plug...
  • Page 51 3 - 4 4 I n s t a l l a t i o n C h a r t 3 - 5 QUA6 Power Fail Transfer Unit (PFTU) installation Step C h a r t 3 - 6 Alarm and transfer wiring (P10) installation The P10 wiring is extended from the rear of the QUX19 unit in the cabinet to the cross-connect terminal using a QCAD294-type cable...
  • Page 52 Chart 3-6 (continued) Alarm and transfer wiring (P10) installation Step P r o c e d u r e If not previously removed, remove the lower rear cover from the cabinet. Tag and install one or two (as required) QCAD294 cables through a round access hole at the rear of the cabinet.
  • Page 53 Chart 3-6 (continued) Alarm and transfer wiring (P10) installation Step P r o c e d u r e Terminate and designate cable 2 (if provided) at the cross- connect terminal as follows (Figure 2-10): • Terminate the black wire associated with the red wire and designate as REM A.
  • Page 54 3-48 Installation Table 3-B PFJ1 emergency transfer cable cross-connections PAIR FUNCTION NUMBER PFTU POWER Note; The SLT (W-O) connects to 24R (BR-V) of cable C from each PE shelf in positions 2 to 5 in a CE cabinet (all PE shelves in RPE and PE cabinets) and to XCE/XPE on the P10 cable served by this PFTU. (Ill553-1145) 2-Mb/s Remote Peripheral Equipment PAIR...
  • Page 55 Figure 3-10 P10 cable terminations and designations To GND On PFTU Consoles To -52V PFTU Power Connecting Block Red White Black Black Black Black Red Red/Black Pair Braided Wire Not Connected (Ill553-1144) To Shelf Transfer To MJ Alarm On All On Console PFTU To Shelf...
  • Page 56 3-50 Installation C h a r t 3 - 7 QPC705 power converter installation The QPC705 power converter mounts in the slot between the QUAA3 power unit and the QUX19 power distribution unit. A QCAD278 cable is required to connect the QPC705 power converter. Step Service in the cabinet is interrupted when performing this step.
  • Page 57 Set the CAB INP breaker on the QUX19 unit to ON. Service should be restored to the cabinet. Reinstall the cabinet cover (if required). C h a r t 3 - 8 QUD24 fan unit installation Step P r o c e d u r e If not previously removed, remove the lower front and top rear covers.
  • Page 58 3-52 Installation 2-Mb/s Remote Peripheral Equipment Install the two extra louvers supplied with the cooling unit assemblies and reinstall the cabinet top assembly (Figure 2-11). Ensure that the QUX19 unit located at the front bottom of the cabinet is equipped with a 3 A fuse in the fuse position designated FN.
  • Page 59 Figure 3-11 Cabinet top assembly Thermostat Optional Additional Shelf Optional Additional Shelf (Common Equipment or RPE Shelf, (Ill553-1141) Screws Cooling Units Base Cabinet One Peripheral Equipment Shelf and Power Equipment) Front View Of Cabinet 2-Mb/s Remote Peripheral Equipment Installation 3-53 Louvered Top Assembly Two Additional...

  • Page 60: Cooling Unit Location And Connections

    3-54 Installation Figure 3-12 Cooling unit location and connections Cabinet Top Panel Note: Cooling units are wired in series. Connections to and between cooling units may not always be as shown. (Ill553-1142) 2-Mb/s Remote Peripheral Equipment CU1 Connector at Rear Mounting of Cabinet Screws...
  • Page 61 C h a r t 3 - 9 QCAD321 junction box assembly installation The QCAD321 junction box assembly is equipped with power and control wiring enclosed in a flexible conduit 5.5 ft (1675 mm) long. The junction box should be installed on the floor or on the wall within 5 ft. (1525 mm) of the cabinet.
  • Page 62 3-56 Installation 2-Mb/s Remote Peripheral Equipment Remove the lock nut from the 90° elbow on the end of the flexible conduit containing wiring from the QCAD321 junction box. Insert the wires and the 90° elbow in the hole at the rear of the cabinet to the right of the cabinet power cord.
  • Page 63 Chart 3-9 (continued) QCAD321 junction box assembly installation Step P r o c e d u r e Insert the wires through the lock nut and secure the 90° elbow to the cabinet. Ensure that the locking teeth on the nut are facing downward against the cabinet metal.
  • Page 64 3-58 Installation 2-Mb/s Remote Peripheral Equipment Connect the power and control wiring from the QCAD321 junction box as follows (see Figure 2-8): • Connect the long black and red wires (designated wires 1 and 2) equipped with ring lugs to terminals 1 and 2 of TB3 at rear of rectifier.
  • Page 65 Chart 3-9 (continued) QCAD321 junction box assembly installation Step P r o c e d u r e Install and connect a 4 AWG red wire between the CHARGE bus in the QBL15 and terminal 1 of terminal block TB1 in the QCAD321 junction box (Figure 2-13 and 2-14).
  • Page 66 3-60 Installation the QBL15 battery distribution box and terminal 3 or 4 of terminal block TB1 in the QCAD321 junction box. —continued— 2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-200...
  • Page 67 Chart 3-9 (continued) QCAD321 junction box assembly installation Step P r o c e d u r e Install and connect a AWG black wire from the positive (+ve) bus in the QBL15 battery distribution box to terminal 5 of terminal block TB1 in the QCAD321 junction box (Figure 2-13 and 2-14) Note: Use one 4 AWG wire for distances up to 100 ft (30 m).
  • Page 68 Chart 3-9 (continued) QCAD321 junction box assembly installation Step P r o c e d u r e Connect the positive test probe of a volt meter to a ground source and test the following terminals: a) Terminal 1 of terminal block TB3 at rear of rectifier. The meter should indicate a minimum reading of 52.08 V.
  • Page 69 3-64 Installation Chart 3-10 QBL15 battery distribution box installation The QBL15 battery box should be located on the wall near the Meridian SL-1 cabinet to readily enable viewing of meters and LED indicators on the front of the unit. Step The QBL15 battery distribution box weights approximately 50 lbs (23 kg).
  • Page 70 Installation 3-65 Install and connect a red 1/0 AWG wire between the negative terminal of the battery string and the negative input (-VE BUS) in the QBL15 battery distribution box (Figure 2-15). —continued— 2-Mb/s Remote Peripheral Equipment Appendix 1 to 553-2741-200...
  • Page 71 3-66 Installation Chart 3-10 (continued) QBL15 battery distribution box installation Step 2-Mb/s Remote Peripheral Equipment P r o c e d u r e Install and connect a black 1/0 AWG wire between the positive terminal of the battery string and the negative bus (± BUS) in the QBL15 battery distribution box (Figure 2-15).

  • Page 72: Qbl15 Battery Distribution Box

    Figure 3-13 QBL15 battery distribution box Positive Bus (Common Connections) Discharge Discharge & Charge Connection Trip & Alarm Leads Sense Leads QPC188 Sense Alarm Fuses Load Alarm Fuses Alarm LED 555-013A 2-Mb/s Remote Peripheral Equipment Diodes Charge Discharge Fuses Note: This may be a 150A fuse or a circuit breaker. 22 in.

  • Page 73: Reserve Power Connections Outside Cabinet

    3-68 Installation F i g u r e 3 - 1 4 Reserve power connections outside cabinet Junction Box (Part of QCAD321 Assembly) Notes: 1. Maximum cable length is 6 ft (1830 mm). 2. Single cable for 100 ft (30 m) or less. Double cable for 100 to 200 ft (30 to 60 m) maximum.
  • Page 74 Figure 3-15 Battery sensing and monitoring connections Junction Box (Part of QCAD321 Assembly) (Ill553-1263) 24 AWG Station Wire 2-Mb/s Remote Peripheral Equipment Installation Part of QBL15 Battery Distribution Unit Monitor TB2 Alarm Trip Alarm Trip Alarm Trip To Second and Third QCAD321 Assemblies (if Equipped) Sense TB1...
  • Page 75 SL-1 2-Mb/s Remote Peripheral Equipment QCA146 cabinet and QSD74 shelf installation and testing © 1987 Northern Telecom All rights reserved. Information subject to change without notice. Group F Standard 90 11 02 Printed in Canada...

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