NACS - 1998 Modem Summary

Covering 306 Modems: Normal (270) and Express (36)
Not including 50 dedicated modems: individual (19) and group (31)

**Session length and per modem use**
Type	Count	Sessions	Total Hrs	Hr/Session	Sessions/modem/day	Hr/modem/day
Normal	276	177096	76019	0.43	30.6	13.1
Express	30	24809	2864	0.12	39.4	4.5
Both	306	201905	78882	0.39	31.4	12.3

**User Demographics**
	Faculty/Staff	Guest	Student- Employee	Student (only)	Total
Used Both	224	10	535	771	1540	16%
Normal Only	1190	42	2009	4318	7559	80%
Express Only	57	3	135	204	399	4%
Total User Base	1471	55	2679	5293	9498	100%
	15%	1%	28%	56%	100%

Rows in the following table show how many distinct users used the modems for the number of sessions given in the first column of the row. Thus, 2605 (27%) of the distinct users used these modems between 3 and 9 times in this 3 week period. And 45% (11+7+27) of the users used the modems no more than 9 times in this 3 week period.

Distribution of Sessions per User
for Weeks 8-10, Spring 1998
Sessions	Faculty/Staff	Guest	Student- Employee	Student (only)	Total
1	130	4	278	640	1052	11%
2	88	4	193	374	659	7%
3-9	386	6	711	1502	2605	27%
10-19	296	12	534	1086	1928	20%
20-49	376	19	651	1132	2178	23%
50-99	152	3	248	436	839	9%
100+	43	7	64	123	237	2%
Total	1471	55	2679	5293	9498	100%
	15%	1%	28%	56%	100%

Length of Sessions

The following table shows how many of the 201905 modem sessions (177096 normal and 24809 express) in this time period lasted less than the time given at the top of each column.

Technical aside: This count of sessions excludes "TTY" sessions whose sole purpose was to establish a SLIP/PPP session.

**Cummulative Distribution of Number of Sessions by Length**
	<3min	<6min	<12min	<18min	<30min	<1hr	<1.5hr	<2.1hr	Total
Normal	42166	67020	94976	111605	131752	156393	165549	170814	177096
	24%	38%	54%	63%	74%	88%	93%	96%	100%
Express	10052	14588	18981	24463	24548	24686	24718	24769	24809
	41%	59%	77%	99%	99%	100%	100%	100%	100%
Both	52218	81608	113957	136068	156300	181079	190267	195583	201905
	26%	40%	56%	67%	77%	90%	94%	97%	100%

The following table show what proportion of the sessions and of the total connect time belongs to sessions of various lengths. For example:

56% of all sessions lasted at most 12 minutes, accounting for 10% of total connect time.
77% of all sessions lasted at most 30 minutes, accounting for 27% of the total connect time.
3% of all sessions lasted at least 2 hours, accounting for 28% of the total connect time.

**Session Length, Number of Sessions, and Cummulative Time**
Time Range	Sessions	TotHrs	Hr/Session	%Sessions	%TotHrs	Time Range
< 12 min	113957	7637	0.07	56%	10%	< 12 min
12-30 min	42343	13123	0.31	21%	17%	12-30 min
< 30 min	156300	20760	0.13	77%	26%	< 30 min
30-60 min	24779	17185	0.69	12%	22%	30-60 min
< 1 hr	181079	37944	0.21	90%	48%	< 1 hr
1-2 hr	13883	19274	1.39	7%	24%	1-2 hr
over 2 hr	6943	21664	3.12	3%	28%	over 2 hr
All	201905	78882	0.39	100%	100%	All

Total Connect Time for Weeks 8-10, Spring 1998

The following tables show how many users in each category had various amounts of total connect time over this 3 week period.

Number of Users in Each Catagory by
Total Connect Time for Weeks 8-10, Spring 1998
Hours	Faculty/Staff	Guest	Student- Employee	Student (only)	Total
At most 1	331	9	854	1856	3050
1-3	302	7	581	1136	2026
3-9	386	13	647	1181	2227
9-30	342	18	443	773	1576
30-90	98	8	139	306	551
Over 90	12	0	15	41	68
	1471	55	2679	5293	9498

Distribution of Users in Each Catagory by
Total Connect Time for Weeks 8-10, Spring 1998
Hours	Faculty/Staff	Guest	Student- Employee	Student (only)	Total	Cummulative
At most 1	23%	16%	32%	35%	32%	32%
1-3	21%	13%	22%	21%	21%	53%
3-9	26%	24%	24%	22%	23%	77%
9-30	23%	33%	17%	15%	17%	93%
30-90	7%	15%	5%	6%	6%	99%
Over 90	1%	0%	1%	1%	1%	100%
	100%	100%	100%	100%	100%

**Total Number of Hours for Weeks 8-10, Spring 1998**
Hours	Faculty/Staff	Guest	Student- Employee	Student (only)	Total		Cummulative
At most 1	131	2	332	686	1152	1%	1%
1-3	563	16	1078	2071	3727	5%	6%
3-9	2113	65	3504	6221	11903	15%	21%
9-30	5531	321	7071	12709	25632	33%	54%
30-90	4608	387	6473	15025	26492	34%	87%
Over 90	2059	0	2064	5838	9961	13%	100%
Total	15005	790	20522	42549	78867	100%
	19%	1%	26%	54%	100%

Taken together, the 2 previous tables show what fraction of the total connect time are used by different types of users. For example:

77% of all users used no more than 9 hours each over these 3 weeks.
The total amount of time this group used was 21% of all the time used.
7% of all users used at least 30 hours over these 3 weeks.
The total amount of time this group used was 46% of all the time used.

**Hours Per User for Weeks 8-10, Spring 1998**
Hours	Faculty/Staff	Guest	Student- Employee	Student (only)	Total
At most 1	0.40	0.24	0.39	0.37	0.38
1-3	1.86	2.24	1.86	1.82	1.84
3-9	5.48	4.99	5.42	5.27	5.34
9-30	16.17	17.83	15.96	16.44	16.26
30-90	47.02	48.33	46.57	49.10	48.08
Over 90	171.60	None	137.57	142.38	146.48
Total	10.20	14.37	7.66	8.04	8.30

The campus on-line directory has "Title" information for over 91% (1344/1471) of users classified as "Faculty/Staff." Splitting this category into "Faculty" and "Staff" based upon whether or not some form of "Professor" appears as part of this "Title" information, one has the following information about maximum and average total hours used within each category for this 3 week period.

**Hours Per User for Weeks 8-10, Spring 1998**
	Maximum 3 Week Total Hours for an individual	Total Hours used by this group	Number of Users	3 Week Average Hours/User
"Faculty"	420	5970	438	13.6
"Staff"	164	9035	1033	8.7
Guest	69	790	55	14.4
Student-Employee	465	20522	2679	7.7
Student (only)	359	42549	5293	8.0
Total	420	78867	9498	8.3

1998 Summary of Modem Use

Length of Sessions

Total Connect Time for Weeks 8-10, Spring 1998