Toshiba Strata Xiie, Strata Xxe Electronic Key Telephone Systems Installation And Maintenance Manual

							PROGRAMMING PROCEDURES 
SECTION 300-020-300 
JULY 1986 
Any key (except INT) may be assigned a fea- NOTE: 
ture code (Figure 3). All assigned feature codes Except for Automatic Dialing m keys, 
have priority over Program 4XX assignments. a feature will be rejected if you try to 
For all keys, write in the code for the feature to enter it at another key once its code has 
be assigned on each station. been entered. Rejected assignments will 
default to m keys. 
FEATURE 
08 
CO8 
09 co9 
10 co10 
11 co11 87 Call forward (CFD) 
88 Microphone cutoff (MCO) 
90 LED ON: DTMF tones on CO/LED OFF: DP (TONE) 
91xX DSS to station XX (DSSl ) 
21 
1 co21 I 
I 
FIGURE 3 - FEATURE KEY ASSIGNMENTS 
5XX Program - Station Class of Service #l 
Sixteen options are selected with this pro- 
gram, using the various keys to change the 
status of their respective LEDs. The s,elections 
listed below must be repeated for each station. 
In all cases, mark an X where required. two lowest numbered stations are 
allowed to use this feature; the others are 
ignored. 
2) DND Override - mark an X next to CO1 6 if 
the station is allowed the DND Override fea- 
ture. 
1) Privacy Override - mark an X next to CO1 7 
if the station is allowed the Privacy Override 
feature. Allows an override (break-in) when a 
CO key is depressed with the CO LED on 
steady. Both parties can hear an override tone. 
NOTE: 
A maximum of two stations are permitted 
to use the Privacy Override feature. If 
more than two are programmed, only the 3) Executive Override (Dial 3) - mark an X 
next to CO1 5 for stations that are allowed the 
Executive Override feature. (No limit to the 
number of stations.) 
4) Door Phone C Ring - mark an X next to 
CO12 if the door phone unit connected to the 
Door Phone Control Box output C is to ring at 
this EKT. Leave blank if this EKT is not to ring. 
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							PROGRAMMING PROCEDURES 
SECTION 300-020-300 
JULY 1986 
5) Door Phone B Ring - mark an X next to 
CO1 1 if the door phone unit connected to the 
Door Phone Control Box output B is to ring at 
this EKT. Leave blank if this EKT is not to ring. 
6) Door Phone A Ring - mark an X next to 
CO10 if the door phone unit connected to the 
Door Phone Control Box output A is to ring at 
this EKT. Leave blank if this EKT is not to ring. 
7) Group Page 4 - mark an X next to CO9 if 
the station is included in Group Page 4. 
8) Group Page 3 - mark an X next to CO8 if 
the station is included in Group Page 3. 
9) Group Page 2 - mark an X next to CO7 if 
the station is included in Group Page 2. 
10) Group Page 1 - mark an X next to CO6 if 
the station is included in Group Page 1. 
11) All Call Page - mark an X next to CO5 if 
the station is included in an All Call Page. 
12) Room Monitor/Warning Tone - mark an 
X next to CO4 if no warning tone will be heard 
when dialing a room monitor (door phone) 
from this EKT. Leave blank if a warning tone 
will be heard at the room monitor. 
13) Handsfree Answerback Disabled - mark 
an X next to CO3 if Handsfree Answerback is 
to be disabled at the station. Leave blank if it is 
not to be disabled (see MC0 key feature). 
14) MIC ON - mark an X next to CO2 if the 
microphone and LED is to be ON at the start of 
a call. CO1 LED (MIC key lock) must be on for 
this feature to function. Leave blank if the 
microphone on the EKT is to be OFF. 
15) m Key Lock - mark an X next to CO1 if 
the m key is to be operated in the push-on/ 
push-off mode. Leave blank if momentary 
operation is required. 
16) Speakerphone Enable - mark an X next 
to INT if the station is allowed to use the 
Speakerphone feature. 
5#XX Program - Station Class of Service 
#2 
Twelve additional Class of Service features 
are selected with this program, using the var- 
ious keys to change the status of their respec- 
tive LEDs. The selections listed below must be repeated for each station. In all cases, mark an 
X where required. 
1) 6000 LCD/2000 LCD - mark an X next to 
CO17 if an alphanumeric (6000 series) LCD 
EKT is used. Leave blank if using a non-alpha- 
numeric (2000 series) LCD EKT. 
2) Station-to-Station Message Waiting with 
LCD Display - mark an X next to CO1 6 if the 
station is allowed the Station-to-Station Mes- 
sage Waiting with LCD feature. 
3) Forced Account Code - mark an X next to 
CO14 if this station is required to use an 
account code on CO lines programmed to 
forced account codes (see Program 102). 
4) Hold Recall Time - referring to Table 1, 
mark an X next to the combination of C012, 
CO1 1 and CO10 that corresponds to the recall 
time desired for each station. If all locations 
are left blank, the timing for that station will 
default to that set in Program 05. 
TABLE 1 
HOLD RECALL TIME CODE 
5) Automatic Off-Hook Selection - mark an X 
next to CO7 if automatic off-hook selection is 
to be CO line Group 94 (defaults to 9 if Single 
CO Line Group was selected in Program 01). 
6) Mark an X next to CO6 if automatic off- 
hook selection is to be CO line Group 93 
(defaults to 9 if Single CO Line Group was 
selected in Program 01). 
7) Mark an X next to CO5 if automatic off- 
hook selection is to be CO line Group 92 
(defaults to 9 if Single CO Line Group was 
selected in Program 01). 
8) Mark an X next to CO4 if automatic off- 
hook selection is to be CO line Group 91 
(defaults to 9 is Single CO Line Group was 
selected in Program 01). 
9) Mark an X next to CO3 if automatic off- 
hook selection is to be the CO line assigned to 
the CO1 position. 
-12-  
						

							10) Mark an X next to CO2 if automatic off- 
hook selection is to be INT. 
NOTE: 
In Program 01, if CO1 5 is left blank, 
items 5, 6, 7 and 8 above will default to 
Dial 9. Item 9 has priority over items 5, 6, 
7 and 8; item 10 has priority over items 5, 
6, 7, 8 and 9. 
11) Ringing Line Preference - mark an X next 
to CO1 if the station is allowed the Ringing 
Line Preference feature. 
12) Automatic Dialing Allowed - mark an X 
next to INT if the station is allowed the Auto- 
matic Dialing feature. 
6XX Program - Station Toll Restriction 
Classification 
Defines Toll Restriction for individual sta- 
tions. Selections must be made for each sta- 
tion, as follows: 
1) Mark an X next to CO6 if Toll Restriction 
Class 4 is in effect at this station. 
2) Mark an 
Class 3 is in 
3) Mark an 
Class 2 is in 
4) Mark an 
Class 1 is in 
NOTE: X next to CO5 if Toll Restriction 
effect at this station. 
X next to CO4 if Toll Restriction 
effect at this station. 
X next to CO3 if Toll Restriction 
effect at this station. 
Programs 100, 1X1, lXY, 1XZ and 2XY 
define and modify Toll Restriction Classes 
and operation. 8#XX Program - CO Ringing Assignments- 
DAY 2 
5) Mark an X next to CO2 if this station will be 
restricted from dialing u or fl as the first or 
second digit. This entry overrides any Toll 
Restriction Class assigned to this station. Selects which CO lines ring at a given sta- 
tion when the system is in the DAY 2 mode. 
This program is applicable only when Three- 
Ring Mode operation was selected in Program 
03 (CO8 LED ON). Selections must be made 
for each station. 
6) Mark an X next to CO1 if the station will be 
allowed to dial 0 + 7-digit number. This entry 
overrides any Toll Restriction Class assigned to 
this station. 
l Mark an X next to each CO line that is to 
ring at the station during DAY2 mode. 
9Xx Program - CO Ringing Assignments- 
NITE 
7) Mark an X next to INT if this station will not Selects which CO lines ring at a given sta- 
be restricted. This entry overrides all other Toll 
tion when the system is in the NITE mode. 
Restriction programming. Selections must be made for each station. 
6#XX Program - Station-to-Station Hunt- 
ing 
l Mark an X next to each CO line that is to 
ring at the station during NITE mode.  PROGRAMMING PROCEDURES 
SECTION 300-020-300 
JULY 1986 
Defines the station hunt destination if the 
called station is busy. Enter the station num- 
ber of the hunt destination next to the station 
number (called). 
7Xx Program - Station Outgoing Call 
Restriction 
Restricts a station from outgoing access to 
any number of CO lines, but leaves it free to 
answer these lines when they are ringing or 
on hold. Selections must be made for each sta- 
tion. 
0 Mark an X next to the CO line that is to 
have restricted access by each station. 
8XX Program - CO Ringing Assignments- 
DAY 
Selects which CO lines ring at a given sta- 
tion when the system is in the DAY mode. This 
program assigns DAY ringing if Three-Ring 
Mode operation was assigned in Program 03 
(CO8 LED ON). Selections must be made for 
each station. 
e Mark an X next to each CO line that is to 
ring at the station during DAY mode. 
NOTE: 
Each line can ring on only eight stations. 
If more than eight are programmed. only 
the eight stations with the lowest station 
numbers will ring. 
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							PROGRAMMING PROCEDURES 
SECTION 300-020-300 
JULY1986 
NOTE: 
Each line can ring on only eight stations. 
If more than eight are programmed, only 
the eight stations with the lowest station 
numbers will ring. 
02.80 Initialization 
02.81 Strata has a list of standard sys- 
tem data assignments stored in ROM that can 
be entered any time by initializing the system. 
The system must be initialized when it is first 
installed or whenever the HCAU is changed. 
This allows the system to be tested and any 
faults corrected before time is spent on pro- 
gramming. Standard data assignments are 
listed in Table 2 in Paragraph 02.90. (How- 
ever, if a system is initialized after user-pro- 
grammed data has been stored, all user data 
will be lost.) 
02.82 To initialize a Strata system: 
a) Make sure the system power switch is in 
the ON position. 
b) Verify that the battery on the HCAU is cqn- 
netted to ensure that data entered after sys- 
tem initialization is not lost due to power fail- 
ure. (The SET LED cannot function if the bat- 
tery is not connected.) 
c) Depress and hold in the 
INT switch on the 
HCAU. 
d) Depress the 
SET switch and allow it to lock. 
l The SET LED lights. 
o All LEDs on station 17 (except SPKR and 
MIC) begin blinking. 
e) Depress and release the 
SET switch again. 
l SET LED goes off. 
l Station 17 LEDs stop flashing. 
IMPORTANT! 
Verify that ALL proper LEDs begin blink- 
ing and go off as indicated in steps d) 
and e) before proceeding. 
f) Release the 
INT switch. 
g) Cycle the power switch 
OFF (HPSU +5V and 
power LEDs must go off) and ON. The system 
is now initialized. 
02.83 The Automatic Dialing memory con- 
tains random numbers when the system is powered up initially. Therefore, it is necessary 
to clear the memory to prevent meaningless 
numbers from being dialed. 
02.84 The Automatic Dialing-System mem- 
ory is cleared as follows: 
a) Depress the 
SET switch and allow it to lock. 
l The SET LED lights. 
l The MW/FL LED on station 17 goes on. 
b) Depress them key on station 17. 
l SPKR LED lights steadily. 
c) Dial I pi on the dial pad. 
l The SPKR LED flashes continuously. 
d) Depress the mm m and m keys. 
l Corresponding LEDs light steadily. 
e) Depress the m key. 
l All station 17 LEDs (except MW/FL) go 
f) Release the 
SET switch. 
l The SET LED goes off. 
l The MW/FL LED on station 17 goes off. 
The Automatic Dialing-System memory is now 
clear. 
02.90 System Data Entry 
02.91 
System data is entered and/or 
changed via station 17 while the system is in 
the programming mode. 
02.92 The system is placed in the program- 
ming mode and data is entered as follows: 
a) Depress the 
SET switch and allow it to lock. 
l The SET LED lights. 
l The MW/FL LED on station 17 goes on. 
b) Refer to the System Record Sheet (Appen- 
dix 1) for data to be entered and/or changes 
that must be made. 
c) Select the required program number. 
d) Refer to the proper programming table for 
detailed procedures for using each different 
program. 
NOTE: 
Each program should be accomplished 
sequentially until all necessary changes 
are made. 
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							PROGRAMMING PROCEDURES 
SECTION 300-020-300 
JULY 1986 
TABLE 2 
INITIALIZED DATA 
SYSTEM OPTIONS 
01 Program 
System Assignments (Basic) 
Alternate Point Answer of Transferred CO Line 
= Allowed 
System Speed Dial Override of Toll Restriction 
= Not allowed 
CO Line Groups = 1 (dial 9) 
Two-CO Line Conference = Allowed 
DP Make Ratio = 40% 
MF Signal Time = 80 ms 
Privacy/Non-Privacy = Privacy 
Station 17 = 20-key EKT 
Incoming Call Abandon = 6 seconds 
Pause Timing After Flash = 1.5 seconds 
Pause After Flash = None 
Pause Timing After PBX Access Code = 1.5 
seconds 
Flash Key Timing = 2 seconds 
Intercom Signalling = Voice first 
02 Program 
System Assignments (Options) 
Tandem Switching = EKT 13 selected 
Stations 18/l 9 Amplified Conference = No 
amplified conference 
OPU #1 /OPX #21 = Not busy 
OPU #2/OPX #23 = Not busy 
OPU #3/OPX #25 = Not busy 
Display Dialed Number Timeout = 15 seconds 
Night Ringing = Excluded from External Page 
Background Music = Excluded from External 
Page 
External Page = Not included in All Call Page 
0#2 Program - Account Code Digit Length 
and TIE Line/OPX Selection 
6 Digits 
OPU #2 TIE Line = OPU 
OPU #l TIE Line = OPU 
03 Program 
System Assignments (Options) 
Door Phone #68 Alarm = Door Phone 
Door Phone #67 Door Lock = Door Phone 
Door Phone #68 Busy = Not busy 
Door Phone #67 Busy = Not busy 
Station 14 Door Phone/EKT = EKT 
Station 13 Door Phone/EKT = EKT 
Station 10 Alarm Key = CO1 0 
Station 10 DND/NT (night) key = NT key 
Ringing Modes = 2 
Tenant Service = Not equipped 
Message Center - station 12 = Not equipped 
Message Center - station 11 = Not equipped 
Message Center - station 10 = Equipped 
DSS 2 Station 11 = Not equipped 
DSS 2 Station 10 = Not equipped 
Door Lock Time = 3 seconds 
04 Program 
CO Outpulsing Selection 
DTMF = Equipped 
05 Program 
Automatic Recall From Hold Timing 
32 Seconds 
0#5 Program 
Camp-on Timeout 
32 Seconds 
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							PROGRAMMING PROCEDURES 
SECTION 300-020-300 
JULY 1986 
TABLE 2 - INITIALIZED DATA (continued) 
CO LINE OPTIONS 
06 Program 
Automatic Release On Hold 
Disabled = All CO lines 
0#6 Program 
Trunk-to-Trunk Connection 
CO Tandem Switching = Disabled 
07 Program Enable 
Enable 
Automatic Release On Hold Timing 
ESS Timing = All CO lines 
08 Program 108 Program 
Toll Restriction Override Code #I 
Blank 
Tenant Service Selection 
Tenant #l = All CO lines 
0#8 Program 
Night Ring Over External Page 
No Ring 109 Program 
Toll Restriction Override Code #2 
Blank 
1 X0 Program 
Toll Restriction Class Parameters 
09,09X Program 
CO Line Group Selection 
Dial 9 Group = All CO lines 
0#9 Program 
Off-Premise Line Hunting 
No Hunting Assigned 
100 Program 
Toll Restriction System Parameters 
AC + NNX 1 + O/C selected 
101 Program 
Toll Restriction Disable 01 or 011 = Allowed 
0 + = Allowed 
AC + 555 = Not allowed 
Used in conjunction with exception code 
tables. 
1 XY Program 
Toll Restriction Class Area Code Entry 
Blank 
1 XZ Program 
Toll Restriction Class Office Code Entry 
Blank 
No Restriction = All CO lines 
102 Program 
Forced Account Code Check 
No Check = All CO lines 
103 Program 
OCC or Equal Access #I 
Blank 1X1 Program - Toll Restriction Class 
Area/Office Code Exception Table Selection 
None Selected 
2XY Program - Toll Restriction 
Area/Office Code Exception Table 
Blank 
190 Program 
PBX Backup 
104 Program 
OCC Authorization Code Length #I CO Operation = All CO lines 
19X Program 
PBX Access Codes 
Blank No Codes Assigned  Blank 105 Program 
OCC or Equal Access #2 
106 Program 
OCC Authorization Code Length #2 
Blank 
-4 6-  
						

							PROGRAMMlNG PROCEDURES 
SECTION 300-020-300 
JULY 1986 
TABLE 2 - INITIALIZED DATA (continued) 
STATION OPTIONS 
3XX Program 
Station CO Line Access 
Access Allowed = All lines, ail stations 
4XX Program 
Station Type Assignment 
20-key “A” Assigned = All stations 
CO1 Start = All stations 
4#XX Program 
Station Flexible Key Assignments 
Assignment = Basic keystrip 
5XX Program 
Station Class of Service #l 
Privacy Override = Not allowed, all stations 
DND Override = Not allowed, all stations 
Executive Override= Not allowed, all stations 
Door Phone Ring A, B, C = Not selected, all 
stations 
Group Page 84 = Not included 
Group Page 83 = Not included 
Group Page 82 = Not included 
Group Page 81 = Not included 
All Call Page = Allowed, all stations 
Room Monitor = Warning tone, all stations 
Handsfree Answerback = Not allowed, all sta- 
tions 
MIC ON/Idle Mode = OFF, all stations 
Ml6 Key Lock = Momentary, all stations 
Speakerphone = Allowed, all stations 
5#XX Program 
Station Class of Service #2 
6000 LCD/2000 LCD = 6000 LCD EKT Station-to-Station Message Waiting with LCD 
= Allowed, all stations 
Forced Account Code = Not required, all sta- 
tions 
Hold Recall Time = Per Program 05 
Automatic Off-Hook Selection = No selection, 
all stations 
Ringing Line Preference = Selected, all sta- 
tions 
Automatic Dial = Allowed, all stations 
6XX Program 
Station Toll Restriction Classification 
No Restriction = All stations 
6#XX Program 
Station-to-Station Hunting 
No Selection = All stations 
7XX Program 
Station Outgoing Call Restriction 
No Restriction = All stations 
8XX Program 
CO Ringing Assignments-DAY 
All Lines Ring Station 10 
8#XX Program 
CO Ringing Assignments-DAY 2 
No CO Ringing Assigned 
SXX Program 
CO Ringing Assignments-NITE 
All Lines Ring Station 11 
02.94 The table and page numbers for the 
various programs follow. 
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							PROGRAMMING PROCEDURES 
SECTION 300-020-300 
JULY 1986 
Table Title 
Program Page 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
16 
17 
18 
19 
20 
21 
22 
23 
24 
25 
26 
27 
28 
29 
30 
31 
32 
33 
34 
:zi 
:z 
39 
40 
41 
42 
43 
44 
45 
46 
System Data Printout Selection Codes 
Automatic Dialing Memory Printout Selection Codes 
System Assignments (Basic) 
System Assignments (Options) 
Account Code Digit Length and TIE Line/OPX Selection 
System Assignments (Options) 
CO Outpulsing Selection 
Automatic Recall From Hold Timing 
Camp-on Timeout 
Automatic Release On Hold Enable 
Trunk-to-Trunk Connection Enable 
Automatic Release On Hold Timing 
Tenant Service Selection 
Night Ring Over External Page 
Single CO Line (Dial 9) Group Selection 
Four CO Line (Dial 91, 92, 93, 94) Groups Selection 
Off-Premise Line Hunting 
Toll Restriction System Parameters 
Toll Restriction Disable 
Forced Account Code Check 
Other Common Carrier (OCC) or Equal Access #I 
OCC Authorization Code Length #l 
Other Common Carrier or Equal Access 
#2 
OCC Authorization Code Length #2 
Toll Restriction Override Code #l 
Toll Restriction Override Code #2 
Toll Restriction Class Parameters 
Toll Restriction Class Area Code Entry 
Toll Restriction Class Office Code Entry 
Toll Restriction Class AOC Exception Table Selection 
Toll Restriction Area/Office Code Exception Table 
PBX Backup 
PBX Access Codes 
- 
Station CO Line Access 
Station Type Assignment 
Station Flexible Key Assignments 
Station Class of Service #l 
Station Class of Service #2 
Station Toll Restriction Classification 
Station-to-Station Hunting 
Station Outgoing Call Restriction 
CO Ringing Assignments - DAY 
CO Ringing Assignments - DAY 2 
CO Ringing Assignments - NITE 
- 
ii: 
0#2 
03 
04 
05 
0#5 
tit3 
07 
Ck23 
09 
09x 
0#9 
100 
101 
102 
103 
104 
105 
106 
108 
109 
4x0 
IXY 
1x2 
1x1 
2XY 
190 
19x 
3xx 
4xx 
4#XX 
5xx 
5#XX 
6XX 
6#XX 
7xx 
8XX 
8#XX 
9xX 20 
20 
27 
28 
29 
30 
34 
32 
33 
34 
35 
36 
37 
38 
39 
40 
41 
42 
43 
44 
45 
46 
47 ,J 
48 
49 
50 
51 
52 
53 
54 
55 
56 
57 
58 
:t 
61 
62 
63 
64 
65 
66 
:3  TABLE LIST 
-18-  
						

							03 SYSTEM DATA PRINTOUT 
03.00 System Data Printout Via SMDR 
03.01 If the Strata system is equipped 
with Station Message Detail Recording 
(SMDR), it is possible to obtain a printout of 
the system data and speed dialing memory via 
a printer that is connected to the SMDR output 
port (HSMB module). b) Depress the m key on station 17. 
l SPKR LED goes on. 
c) Dial Bi. 
l The SPKR LED begins to flash. 
03.02 The data should be printed during a 
low traffic period since this procedure inter- 
feres with normal SMDR output. Any call 
records generated during a printout will be 
lost. d) The INT and CO1 - 8 LEDs switch on and off 
in response to operation of the associated 
keys. Refer to Tables 3 and 4 and set the 
appropriate LEDs to the proper pattern for the 
printout required. 
e) Depress the m key. 
@ All station 17 LEDs (except MW/FL) go 
off. 
03.03 Commands to print system data are 
entered by station 17 while it is in the pro- 
gramming mode. It is possible to print out all 
or parts of the system data and speed dial 
memory. The possible choices are: o Printout begins (see Figures 4 w 9 for 
examples of the printout format). 
f) Normal SMDR operation resumes when the 
System Data: 
l All data 
: 
r 0 Programs 01 - 0#9 
0 Programs 100 - 1X1; 190 & 19X 
0 Program 2XY 
l Program 3XX 
l Program 4XX 
l Program 4#XX 
l Program 5XX 
l Program 5#XX 
l Program 6XX 
l Program 6#XX 
l Program 7Xx 
l Program 8XX 
l Program 8#XX 
l Program 9Xx printout is complete. 
g) Repeat from step b) until all desired 
outs are completed. 
h) Release the SET switch on the HCAU. 
03.05 To stop a printout before it is 
pleted: 
a) Depress the m key on station 17. 
e SPKR LED goes on. 
b) Dial Bi. 
l SPKR LED stays on. 
l The INT and CO1 - CO8 LEDs light. 
c) Depress the appropriate keys necessary to 
extinguish all LEDs but that of the SPKR. 
d) Depress the m key. 
l The SPKR LED goes off. 
l After a short delay, the printout stops. 
Automatic Dialing Memory: 
e) Normal SMDR functions resume. 
l All data 
l System list 
l Any individual station list 
03.04 To request a printout: 
a) Depress the SET switch on the HCAU. 
l SET LED goes on. 
l Station 17 MW/FL LED goes on. PROGRAMMING PROCEDURES 
SECTION 300-020-300 
JULY 1986 
print- 
com- 
-19-  
						

							PROGRAMMING PROCEDURES 
SECTION 300-020-300 
JULY 1986 
TABLE 3 
SYSTEM DATA PRINTOUT SELECTION CODES 
PROGRAM NUMBER 
LED on = X LED off = 0 
TABLE 4 
AUTOMATIC DIALING MEMORY PRINTOUT SELECTION CODES 
AUTO DIAL LISTS (System & Stations 10 - 19) 
AUTO DIAL LISTS (Stations 20 - 29) AUTO DIAL LISTS (Stations 30 - 39) 
co2 0 0 0 0 x x x x 0 0 
co1 0 0 x x 0 0 x x 0 0 
INT 0 X 0 X 0 X 0 X 0 X  IINTI o I )  LED130 
131 132 133 134 135136 137 138 
1391 
CO81 X 
-2o-