Southern California Edison is the second-largest investor-owned electric utility company in the United States. It has over 4.8 million customer accounts in a 50,000 square mile service territory serving much of southern California and parts of central California.

Conventional simplex channels:

Zone: TA

TA1	936.6375	D245
TA2	936.6625	D245
TA3	939.9750	D245
TA4	939.9875	D245

"OPS" talkgroups are used by Toublemen. "TSD" stands for Transportation Service District. There are four of them; they are: North, East, South and West. For "OPS" and "FSR" the Customer Service District Offices are shown in their TG Descriptions.

Tranmission/Substation Talkgroups:

The TS talkgroups are named for the substations that served as the transmission, subtransmission, and distribution switching centers for their surrounding areas at the time the trunked radio system was installed. Over the years, many of these substations have been automated and unmanned, and the operations personnel have been moved to centralized switching centers that handle switching center activities for multiple locations. When the trunked radio system was installed, there were 28 manned switching centers and hence 28 TS talkgroups. Today there are only about half that many switching centers, but the original 28 talkgroups continue to be used, with some switching centers handling traffic on several different talkgroups at several different desks. All desks identify themselves on the air with the name of the switching center, however, regardless of the name of the talkgroup being used.

The names of the TS talkgroup substations and their general locations are shown below:

TG Substation      General Location
-------------      ----------------
Barre              Stanton
Center             Norwalk
Chino              Chino
Control            Bishop
Dalton             Irwindale
Del Amo            Cerritos
Devers             North Palm Springs
Eldorado           Boulder City, NV
Ellis              Huntington Beach
La Cienega         Culver City
La Fresa           Torrance
Lighthipe          Long Beach
Lugo               Hesperia
Mesa               Monterey Park
Mira Loma          Ontario
Moorpark           Moorpark
Padua              Upland
Pardee             Valencia
Rector             Visalia
Santa Clara        Ventura
Santiago           Irvine
State Street       Long Beach
Valley             Romoland
Vestal             Richgrove
Villa Park         Orange
Vincent            Palmdale
Vista              Grand Terrace
Walnut             Industry

Callsigns for personnel are actually the numbers of individual radios and they must show up on the screens of dispatchers in the substations and distribution operation centers. Called "DOC" on the radio they are located in the following places: San Bernardino County and called "Eastern DOC" (formally called "Foothill DOC"), "Northern DOC" in Ventura (formally called "Ventura DOC"), "Western DOC" located in Dominquez Hills (formally called "Dominquez Hills DOC"), and "Southern DOC" in Santa Ana (formally called "Santa Ana DOC"). The DOC's take phone calls regarding service problems and dispatch district personnel and area troublemen. Each DOC can dispatch and control the SCE grid system-wide in addition to doing so in their respective areas. Most of the district troublemen seem to have xx10+ numbers where xx is the district number. District Field Service Representatives (FSR's) have xx60+ numbers where xx is the district number. "Division", location unknown, dispatches them. FSR's are people who read meters, contact customers for energy audits, shut off power to customers who have not paid, etc. Then there are the Trouble Service District troublemen who have calls of 93xx in the Eastern Area, 95xx in the Northern Area, 92xx in the Western Area, and 94xx in the Southern Area. The xx is assigned in a strange manner (Can someone explain?). It's unsure if they are formally called "areas" and if they correspond with the areas DOC's are in charge of. They might be called "regions" instead of areas.