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Equipment specification and operation

Page 19 of 64

Centralized Attendant Service Description and engineering

The RLT recognizes an increase in the DC resistance across the tip and ring
leads from 1300

Ω

or less to 20-K

Ω

or more as an on hook signal. The on

hook signal should be timed for 200 ms to 1.0 second. If the conductor loop
resistance changes back to low resistance (off hook) in this interval, the RLT
interprets that as a flash signal from the CAS attendant.

When the RLT has been seized for an incoming CO call, a dial “0” call, an
intercept call, or a hold recall after the CAS attendant has talked to the calling
party, the detection of the first flash signal prompts the connection of a
Digitone receiver to the RLT and splits the calling party away from the RLT.

A dial tone is sent to the CAS attendant when the Digitone receiver is
available to receive address signals. The dial tone is removed within 50 ms of
the start of dialing the first address character. If the RLT detects a subsequent
flash signal while connected to a receiver—that is, an attendant flash to clear
the receiver—it disconnects the receiver and returns to its initial state
(connection with the calling party).

When the receiver has translated the dialed address characters, different
confirmation tones are sent to the CAS attendant, depending on the status of
the called telephone.

Disconnect

The RLT recognizes and times an increase in the DC resistance across the tip
and ring leads from 1300

Ω

or less to 20-K ohms or more as an on hook from

the CAS attendant. If the on hook lasts longer than the flash timer, the RLT
interprets the change as a disconnect.

After interpreting disconnect from the attendant, the RLT opens the tip and
ring leads to the interfacing CO trunk at the Main site, sending a disconnect
signal to the Main site. To prevent the RLT from being seized from a new call
before the CO trunk at the Main site has released, the RLT provides a busy
guard timer.

Operation at the Main site

Idle state

There is a resistance greater than 20-K ohms across the tip and ring leads at
the CO trunk interface during the idle state.

EquipSp.BDY Page 19 Tuesday, January 14, 1997 9:16 AM

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Содержание TFC002

Страница 1: ...mply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules and the radio interference regulations of Industry Canada These limits are designed to provide reasonable protect...

Страница 2: ...ing Due to the extent of the changes revision bars are not used December 1992 Standard Release 3 00 This document is reissued to include technical content updates Revision bars are omitted December 19...

Страница 3: ...0 calls 8 Directory Number Expansion 8 Flexible Attendant Directory Number 9 Listed Directory Number calls 9 Message Registration 10 Night Service 10 Property Management System 11 Recorded Overflow An...

Страница 4: ...lation and connections 22 Engineering information 25 Memory and real time requirements 25 Traffic measurements 25 Trunks TFC002 25 Queue TFC003 26 Console TFC004 27 Calculating the number of RLT circu...

Страница 5: ...ervice Description and engineering List of figures Figure 1 Typical CAS configuration 2 Figure 2 QPC250 RLT cross connections to QPC70 CO trunk 23 Figure 3 TFC003 measurements at a Remote site when a...

Страница 6: ...RLT delay 2 00 seconds 31 Table 4 Release Link Trunk requirements Average speed of answer 2 00 seconds average RLT delay 4 00 seconds 32 Table 5 Release Link Trunk requirements Average speed of answe...

Страница 7: ...ments Average speed of answer 5 00 seconds average RLT delay 6 00 seconds 35 Table 12 Release Link Trunk requirements Average speed of answer 6 00 seconds average RLT delay 2 00 seconds 36 Table 13 Re...

Страница 8: ...e RLT delay 4 00 seconds 39 Table 20 Release Link Trunk requirements Average speed of answer 10 00 seconds average RLT delay 6 00 seconds 40 Table 21 CAS attendant requirements Average speed of answer...

Страница 9: ...the Remote locations are interconnected by TIE trunks The types of calls that require attendant assistance and can be handled by a CAS attendant are as follows Listed Directory Number LDN calls Dial 0...

Страница 10: ...ch as Camp On during call processing The system can serve as either a Main or a Remote site Operation is compatible with AT T Technical Advisory Manual 10 TA 10 CAS is therefore compatible with any sy...

Страница 11: ...controlled at one location or distributed among various locations with each switch controlling access locally When special service circuits are located at the Main site the CAS attendants have trunk g...

Страница 12: ...all Remote locations are Meridian 1 sites An alternative is to provide toll restriction at all Remote locations and force all toll calls to be routed through CAS attendants for manual record keeping...

Страница 13: ...sion problems with tandem TIE trunk connections that occur when BARS NARS is provided separately at each location The centralized BARS NARS feature can be used only if all special service outgoing tol...

Страница 14: ...ard External Deny CFXD is activated on a telephone Call Park Call Park is limited to the local switch and cannot be accessed from an RLT An RLT cannot be parked at the Main location Call Party Name Di...

Страница 15: ...nfirmation tone a 100 ms burst of 440 Hz tone to the CAS attendant over the RLT and then connects to the calling party If the calling party wants to wait the CAS attendant releases and a disconnect si...

Страница 16: ...to the Remote Departmental Directory Number When CAS is active at the Remote Attendant Console Departmental Listed Directory Number DLDN calls at that Remote site are handled at the CAS Main as if the...

Страница 17: ...e made Do Not Disturb DND busy and if they appear on a Lamp Field Array the associated LED is always dark Listed Directory Number calls Calls to the Listed Directory Number LDN of the Main site are tr...

Страница 18: ...incompatible with each other If both are enabled CAS takes precedence over MR Night Service Night Service at the Main CAS attendant location is applicable to calls at the Main location and to calls r...

Страница 19: ...peration each Remote Peripheral Equipment RPE location in a CAS network is considered to be part of the site to which it is connected This means that the Remote end of the RPE connection shares the sa...

Страница 20: ...an also hold the RLT at the console by operating the HOLD key This differs from Silent Hold in that the CO trunk is held at the Main site over the RLT rather than at the Remote end Station Category In...

Страница 21: ...the Remote site and the RLT connection is removed Further timed recalls cause the preceding process to be repeated until either the called telephone answers or the calling party disconnects When the...

Страница 22: ...se destination RLS DEST key and then following the procedure for an LDN call The RLS DEST key sends a timed flash over the RLT which drops the initial telephone This procedure applies to all calls int...

Страница 23: ...e QPC609 TDS card or the NT8D17 conference TDS card At the Remote site all TDS cards must be the same type they cannot be mixed The TDS cards can be mixed at the Main CAS location Table 1 Meridian 1 p...

Страница 24: ...2 wire QPC71 or a 4 wire QPC237 TIE trunk at both the Remote and Main locations with a repeater facility between the two Another configuration is to have an NT8D15 E M trunk card at the local locatio...

Страница 25: ...e CAS attendant Each circuit on the QPC250 RLT card has the following specifications Operation at the Remote site Idle state The RLT at the Remote site is connected to a CO trunk circuit at the Main s...

Страница 26: ...er supervision The RLT detects a decrease in DC resistance across the tip and ring leads from at least 20 K to 1300 or less as an off hook signal from the Main site equipment If the off hook signal pe...

Страница 27: ...ects a subsequent flash signal while connected to a receiver that is an attendant flash to clear the receiver it disconnects the receiver and returns to its initial state connection with the calling p...

Страница 28: ...sfied the call is not presented to the CAS attendant Disconnect before the attendant answers Before the attendant answers the call tone ringing should be 2 seconds on and 4 seconds off If there is no...

Страница 29: ...is available When the CAS attendant wants to release from a prior request for example a call extended to a busy telephone the Release Destination RLS DEST key on the console is pressed The operation o...

Страница 30: ...Meridian 1 system installation procedures When telephone lines connected to the trunk circuit are exposed to foreign voltages by direct contact or induction for example by power line crosses or by li...

Страница 31: ...lant cable pairs QPC70 CO trunk pack T1 9 R1 9 T0 9 R0 9 30 5 26 1 W S S W W BL BL W W S S W W BL BL W R O O R W G G W MDF H V Part of 25 pair cable PE shelf PE shelf 30 5 26 1 32 7 28 3 T1 6 R1 6 T0...

Страница 32: ...em clocks and traffic schedules for each location should be set and maintained in reasonable synchronization See Traffic measurement formats and output for details concerning traffic schedule outputs...

Страница 33: ...are recorded in the normal manner at the Main site For measurements at the Remote site when CAS is active TFC003 definitions should be interpreted as follows See also Figure 3 Average attendant respo...

Страница 34: ...hen the CAS feature is active calls originating from the Remote site are treated as incoming trunk calls at the Main site Figure 3 TFC003 measurements at a Remote site when a call waits for an RLT to...

Страница 35: ...son busy hour ABSBH traffic Note 1 Where ground start signaling is used for RLT circuits for example with a QPC250 RLT trunk card at the Remote site and a QPC70 CO trunk card at the Main site add a mi...

Страница 36: ...the appropriate column in the table according to the attendant work time 4 Select from the chosen column a number T that is greater than or equal to the value Ta that was determined in step 1 Example...

Страница 37: ...e The engineering procedure is as follows 1 Calculate the attendant traffic Ta generated at the Remote site by using this formula Ta x AWT 100 CCS the number of calls per hour in a Remote site or the...

Страница 38: ...ant traffic Ta at Remote site 1 100 CCS Attendant traffic Ta at Remote site 2 120 CCS Then Tt 170 100 120 CCS Tt 390 CCS Table 3 Release Link Trunk requirements Average speed of answer 2 00 seconds av...

Страница 39: ...2 131 130 128 126 125 123 121 120 118 7 138 154 158 158 156 155 153 151 149 148 146 145 8 159 179 183 184 183 182 180 178 176 174 173 171 Table 5 Release Link Trunk requirements Average speed of answe...

Страница 40: ...86 102 107 108 108 107 105 104 103 102 101 100 7 105 125 132 134 134 133 132 131 131 129 127 126 8 122 149 157 160 160 160 159 158 156 155 154 153 Table 7 Release Link Trunk requirements Average spee...

Страница 41: ...116 119 120 119 119 118 117 116 115 114 7 105 130 139 143 144 144 144 143 142 141 140 139 8 122 151 162 167 169 170 169 169 168 167 166 165 Table 9 Release Link Trunk requirements Average speed of an...

Страница 42: ...6 79 101 110 113 115 116 115 115 114 114 113 112 7 94 121 131 136 139 140 140 140 139 138 138 137 8 109 140 153 160 163 164 165 165 164 164 163 162 Table 11 Release Link Trunk requirements Average spe...

Страница 43: ...68 87 95 98 99 99 99 99 98 97 97 96 7 83 107 117 121 123 124 124 124 123 123 122 121 8 98 128 140 145 148 149 150 150 149 149 148 147 Table 13 Release Link Trunk requirements Average speed of answer 6...

Страница 44: ...7 86 86 6 71 94 104 108 111 112 112 112 112 111 111 110 7 85 112 124 130 134 135 136 136 136 136 135 134 8 98 131 145 153 157 159 160 160 160 160 160 159 Table 15 Release Link Trunk requirements Avera...

Страница 45: ...82 94 100 103 105 106 107 107 107 106 106 7 70 98 112 120 124 127 129 130 130 130 130 130 8 82 115 131 140 146 149 152 153 154 154 154 154 Table 17 Release Link Trunk requirements Average speed of ans...

Страница 46: ...7 67 67 67 6 47 67 77 82 86 88 89 89 90 90 90 89 7 58 83 95 103 107 110 111 112 113 113 113 113 8 68 98 114 123 129 132 134 136 137 137 137 137 Table 19 Release Link Trunk requirements Average speed o...

Страница 47: ...T in seconds 1 5 6 10 11 15 16 20 21 25 26 30 31 35 36 40 41 45 46 50 51 55 56 60 Attendant traffic Ta in CCS 1 3 4 4 3 3 3 3 3 2 2 2 2 2 12 17 19 19 19 19 19 18 18 18 17 17 3 21 30 35 37 38 38 38 38...

Страница 48: ...0 38 37 35 34 33 32 4 103 88 80 74 70 67 64 62 60 58 56 55 5 136 120 110 104 99 95 91 89 86 84 82 81 6 170 153 142 134 129 124 120 117 114 112 110 108 7 205 186 174 166 159 154 150 146 143 140 138 136...

Страница 49: ...3 42 40 4 116 103 94 88 84 80 77 74 72 70 68 67 5 151 136 127 120 115 110 107 104 101 99 97 95 6 186 170 160 153 147 142 138 134 131 129 126 124 7 221 205 194 186 179 174 169 166 162 159 156 154 8 257...

Страница 50: ...50 48 46 45 44 4 120 107 99 93 88 84 81 79 76 74 72 71 5 155 141 132 125 120 116 112 109 106 104 102 100 6 190 176 166 158 153 148 144 140 137 134 132 130 7 225 211 200 192 186 180 176 172 169 166 16...

Страница 51: ...48 46 4 123 111 103 97 92 88 85 82 80 78 76 74 5 157 145 136 130 124 120 116 113 110 108 106 104 6 191 180 170 163 157 153 148 145 142 139 136 134 7 225 215 205 197 191 186 181 177 174 171 168 166 8 2...

Страница 52: ...57 55 54 52 51 4 123 114 107 102 98 94 91 88 86 84 82 80 5 157 148 140 135 130 126 122 119 117 114 112 110 6 191 181 174 167 162 158 154 151 148 145 143 141 7 225 215 207 201 195 190 186 183 180 177...

Страница 53: ...53 52 4 123 114 107 102 98 94 91 88 86 84 82 80 5 157 148 140 135 130 126 122 119 117 114 112 110 6 191 181 174 167 162 158 154 151 148 145 143 141 7 225 215 207 201 195 190 186 183 180 177 174 172 8...

Страница 54: ...Main TYPE CDB ATT Customer Data Block Release 21 gate opener CUST xx Customer Number ATDN nnnn DN that must be dialed by local telephones to reach the CAS Main attendant default is 0 ICI 0 19 Rnnnn As...

Страница 55: ...DB Route Data Block CUST xx Customer Number ROUT 0 511 Route Number TKTP RLM Release Link Main trunk type ICOG ICT Incoming trunk route ACOD nnnn Trunk access DN This DN and the Route Member Number di...

Страница 56: ...ended Prompt Response Description REQ NEW CHG Add or change the CAS Main TYPE RLM Release Link Main trunk TN l s c u c u Terminal Number For Option 11 XTRK XUT XEM EXUT Extended Universal Trunk card E...

Страница 57: ...Customer Data Block Release 21 gate opener CUST xx Customer Number ATDN nnnn DN that must be dialed by local telephones to reach the CAS Main attendant default is 0 CAS NO YES Do not change CAS optio...

Страница 58: ...on 11 KEY nn CAS Add a CAS key Prompt Response Description REQ NEW CHG Add or change TYPE RDB Route Data Block CUST xx Customer Number ROUT 0 511 Route Number TKTP RLR Release Link Remote trunk type I...

Страница 59: ...DC ETH FEC JNT ORG Far end disconnect control Either end Far end Joint control Originating end recommended Prompt Response Description REQ NEW CHG Add or change TYPE RLR Release Link Remote trunk type...

Страница 60: ...I or loop key To extend calls to a CAS Remote site follow these steps 1 Press the signal Remote key 2 When you hear the special dial tone dial the Remote DN 3 Press the RLS key Remote operation To act...

Страница 61: ...enabled 4 From any telephone dial the DN of an RLT If the RLT is busy a busy tone is heard If the RLT is idle the following events occur A Ringback RGB tone is heard When the CAS attendant answers th...

Страница 62: ...AS attendant This call is presented to the CAS attendant preceded by an identifying tone two 100 ms bursts of 440 Hz tone 12 From any telephone dial the access code for an outside line When the second...

Страница 63: ...ination RLS DEST key 5 From any telephone dial the access code for a TIE trunk to a Remote location When the second dial tone optional depending on the route is heard dial the DN for an RLT This call...

Страница 64: ...e is idle 2 Place a call to the console from a Remote site The ICI key is lit The SRC key flashes at 60 ipm A ringing tone is heard The digit display shows the access code and trunk member number of t...

Страница 65: ...The ICI SRC and LPK keys are lit 2 Press the SIG REMOTE key A dial tone is heard The calling party is excluded 3 Dial the DN of a busy Remote telephone The DEST key flashes at 60 ipm QCW4 The Camp On...

Страница 66: ...al condition A two way conversation between the attendant and the calling party The ICI SRC and LPK keys are steadily lit 2 Press the SIG REMOTE key A dial tone is heard The calling party is excluded...

Страница 67: ...and the radio interference regulations of Industry Canada These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environ...

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