City of Cambridge Trunking System

Cambridge City services such as Police, Fire, Department of Public Works, and other municipal agencies all use this trunking system. As of January 2004 they have migrated over to all Type II talkgroups.

SITE LOCATIONS

The City of Cambridge Trunking System has one site.

FREQUENCIES

The system ID for this site is bb39h. This site is licensed under callsigns WNGH670, WPSE405 and WBJW653 to operate on the following frequencies:

Frequency	Functions
868.7875	Voice
867.6875	Voice
867.3000	Voice
866.3250	Voice
860.7875	Control, Voice
859.7875	Control, Voice
858.7875	Control, Voice
857.7875	Control, Voice
856.7875	Voice
853.2625	Voice, CWID

FLEET MAP

This system is a type IIi system with the following TrunkTracker fleet map:

TrunkTracker Fleet Map

Block	Size Code	Block	Size Code
0	S4	4	S12
1	S4	5	---
2	S0	6	S0
3	S4	7	S0

TALKGROUPS

The following talkgroups are used on the City of Cambridge system:

Talkgroup	User
16400	DPW "F1" Primary
16432	DPW "F2" Construction?
16464	DPW "F3" Maintenance?
16496	DPW "F4" Forestry?
16528	DPW "F5" Rubbish?
16560	DPW "F6" Reserved?
16592	DPW "F7" Supervisors?
16688	???
16720	Municipal Golf Course
16816	Fire "F1" Dispatch (154.355)
16848	Fire "F2" Common/Routine Messages
16880	Fire "F3" Training
16912	Fire "F4" Metrofire Red (483.3125) Apparatus crosstalk
16944	Fire "F5" EMS
16976	Fire/Police "F6" Inter-Agency
17008	Fire "F7" Cambridge Hospital Notification
17040	Fire "F8" Administration / Fire Alarm Maint
17072	Fire "F9" Investigation?
17104	Fire "F10" City Supervisors?
17136	Fire "F11" Investigation?
17168	Fire "F12" Hazmat?
17200	Fire "F13"?
17232	Fire "F14"?
17264	Fire "SCAN 16" Fireground (854.4875)
17296	Fire ???
17472	Police Dispatch
17584	???
17616	???
17680	Police ???
17744	Police "F1" (470.3125)
17776	Police "F2" Information
17808	Police "F3" BAPERN3 (patch from 470.7875)
17840	Police "F4"
17872	Police "F5"
17904	Police "F7" Supervisors
17936	Police "F8" Administration
17968	Police "F9" Narcotics
18032	Police "F10" Juvenile 1
18128	Police ???
18192	Police "F11" Traffic 1
18224	Police "F14" Special Ops
18256	Police "F15" Animal Control?
18416	Traffic/Parking ATG???
18448	Municipal Traffic/Parking
18480	Municipal Water/Sewer?
18576	Municipal ???
18608	Municipal Golf Course?
18672	Municipal School Buses?
18768	Municipal Elder Vans?
18800	Municipal ???
18896	Municipal ???
18960	???
19024	MIT Campus Police (patch from 867.4375R/146.2)
19056	???
19632	Professional Ambulance
19664	???
19696	???
19728	???
19792	Fire "F15"
19856	???
19888	???
19920	???
20048	Fire Alarm Maintenance (Electric Dept)
20080	???
20112	???
20144	Inspectional Services
20528	Hospital Maintenance?
20560	???
20592	Hospital Security (City Hospital?)
20624	???
20656	???
20688	Hospital Maintenance?
20816	EMS to Cambridge City Hospital
20848	EMS to Mt. Auburn Hospital
20880	EMS to Somerville Hospital
21040	Fire ATG (announcements to all Fire radios)
21104	???
21232	? Fire Alert Channel
22480	Belmont FD
24208	???
25584	???

OLD TALKGROUPS

The following talkgroups were used on the City of Cambridge system before they switched over to a Type II system and are no longer used, but are included on this page until we can figure out what all the new Type II talkgroups are:

Talkgroup	User
000-1	Fire "F1" Dispatch (154.355)
000-2	Fire "F2" Common/Routine Messages
000-3	Fire "F3" Training
000-4	Fire "F4" Metrofire Red (483.3125) Apparatus crosstalk
000-5	Fire "F5" EMS
000-6	Fire "F6" Interagency (shared with Police)
000-7	Fire "F7" Cambridge Hospital Notification
000-8	Fire "F8" Administration
000-9	Fire "F9" Investigation
000-10	Fire "F10" City Supervisors
000-11	Fire "F11" Investigation
000-12	Fire "F12" Hazmat
000-13	Fire Talkaround for "F14" (854.4875R)
000-14	Fire "F14" Fireground
000-15	Fire Talkaround for "F16" Fireground
100-1	DPW "F1" Primary
100-2	DPW "F2" Construction
100-3	DPW "F3" Maintenance
100-4	DPW "F4" Forestry
100-5	DPW "F5" Rubbish
100-6	DPW "F6" Reserved
100-7	DPW "F7" Supervisors
300-1	Police "F1" Operations
300-2	Police "F2" Information
300-3	Police "F3" BAPERN 3
300-4	Police "F4" BAPERN 2 or 4
300-5	Police "F5" Chit-Chat (Details, Overtime, Non-emergency conversation)
300-6	Police "F6" Interagency
300-7	Police "F7" Supervisors
300-8	Police "F8" Administration
300-9	Police "F9" Narcotics
300-10	Police "F10" Juvenile
300-11	Police "F11" Traffic
300-12	Police "F12" Investigators
300-13	Police "F13" Investigators
300-14	Police "F14" Special Operations
300-15	Police "F15" Animal Control
400-1	Municipal Traffic/Parking
400-2	Municipal Water/Sewer
400-6	Municipal Golf Course
400-8	Municipal School Buses
400-10	Municipal City Hospital Security
400-11	Municipal Elder Vans

CONVENTIONAL FREQUENCIES

The following frequencies are used for simplex operation on the City of Cambridge system:

Frequency	User
852.2625 D-125	Fire "F14" Secondary Fireground for MBTA Use
854.4875 D-125	Fire "F16" Primary Fireground
867.4375 146.2	MIT Police

Last Modified: July 30, 2005
Mail comments and suggestions to:

stjohnso@lynx.dac.neu.edu