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2. CONCEPTOS BASICOS EN TELECOMUNICACIONES - Ensayos - JOMAGOZ

Caracteristicas Comunicacin libre de colisiones mediante el uso de un mecanismo de tiempo de ranura (time-slot) Protocolo de comunicacin altamente eficiente (pocas overhead) Telegrama extremadamente bajo en jitter (determinado a menos de 1 microsegundo, en la prctica tan bajo como 35 nanosegundos) Perfiles normalizados altamente desarrollados. More than 25 FREE slots with large smoothly animated reels and realistic slot machine sounds. Play FREE and WIN CASH! Specifies the slot number of a new drive to be added.-level. Specifies the target RAID level after adding a new drive. If the target RAID level is the same as the original RAID level, the command expanses the RAID capacity. If the target RAID level is different from the original RAID level, the command changes the RAID level. Each time slot may be 1 byte long or could be a frame of multiple bytes. TDD alternates the transmission and reception of station data over time. Time slots may be variable in length.

XEJP-FM is a radio station in Mexico City. Located on 93.7 MHz, XEJP-FM is owned by Grupo Radio Centro and broadcasts contemporary music in Spanish from the 1980s to the present as 'Joya 93.7'.

History[edit]

XEJP traces its lineage to the first FM radio station in Mexico. In April 1947, the Diario Oficial de la Federación ran an advisory asking for comments on the proposed award of a station on 94.1 MHz to Federico Obregón Cruces, and while said authorization was given on November 28, 1948, it was not until December 30, 1952 that the concession was awarded and the first FM station in Mexico came to air. 'XHFM' broadcast with 3,000 watts and would be alone on the band until the sign-on of XEOY-FM in 1955.^[2]

The story of Radio Joya, as XHFM was known, was cut short on July 28, 1957, when an earthquake led to the total destruction of its studio facilities. However, the concession lived on. In 1958, as Obregón Cruces began to focus on building a new AM radio station, XHFM's concession passed to Francisco Aguirre Jiménez, the founder of Radio Centro. Owing to the low penetration of FM receivers and the preference of advertisers for AM, the station remained off the air until 1974, but during this period, significant changes were occurring. A realignment of Mexico City FM frequencies shifted the first few stations 400 kHz and led to a move to 93.7. Additionally, as was already the case with Radio Centro's other FM stations, the callsign was changed to match one of the company's existing AM outlets and XHFM became 'XEJP-FM'. The XHFM callsign would not return to Mexican radio until 2010, when an unrelated XHFM signed on in Veracruz.

XEJP, now on 93.7 MHz, took to the air once more in 1974 as 'Radio Joya', with a format of music in Spanish from the 1950s, 60s and 70s. By the end of the decade, it had already undergone two more changes in concessionaire, with Radio América, S.A., and then Radio Impulsora de la Provincia, S.A. de C.V., becoming the concessionaires. In 1991 the station became known as 'Stereo Joya' as part of a general refresh of Radio Centro's FM stations; it now had a format of contemporary and romantic music in Spanish.

In 1993, Mariano Osorio, who had hosted news on XEEST-AM 1440 'Radio Éxitos', moved to XEJP-FM. He would become the station's signature personality, beginning with a morning show that on November 22, 1999 expanded to a seven-hour time slot (from 6:00 am until 1:00 pm), known as Hoy con Mariano. This was the first radio program of such a length in Mexico, and the format would later be used by other GRC stations. XEJP also picked up the En Concierto series of interviews with musical artists, which had previously aired on Radio Centro 1030. In 1996, a nightly program named Esencia de Mujer, hosted by Rocio Brauer, was added. Both programs ended their runs in November 2015. A nightly program known as Nocturno 93-7, hosted by voice actors Mario Arvizu and Sonia Casillas as well as Osorio's assistant Carlos Valle, replaced the latter on May 2, 2016.

In 2012, the station's name was changed to just 'Joya 93.7'. With only these slight variations, the station has used 'Joya' in its name throughout its entire history.

References[edit]

1. ^Instituto Federal de Telecomunicaciones. Infraestructura de Estaciones de Radio FM. Last modified 2018-05-16. Retrieved 2015-07-07. Technical information from the IFT Coverage Viewer.
2. ^CIRT Historia

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Time slots are the smallest division of a communication channel that is assigned to particular users in a communication system. Time slots can be combined for a single user to increase the total data transfer rate available to that user. In some systems, time slots are assigned dynamically on an asneeded basis.

Slot structure is the division of a time slot into different fields (information) parts. Slot structure fields typically include a preamble for synchronization, control header (e.g. address information), user data, and error detection.

The time period for a GSM time slot is 577 microseconds. The number of data bits in a time slot depending on the type of the time slot (user data or control). The structure of the time slot can also vary dependent if the time slot is on the uplink or downlink radio channel. Each normal time slot contains 148 bits of information. Some time slot data bits are used for user data and others bits are dedicated for control.

CONCEPTOS BASICOS EN TELECOMUNICACIONES - Ensayos - JOMAGOZ

The time slots are numbered from 0 to 7. For voice communication, users have a fixed assignment of particular time slots. For packet data transmission (such as GPRS), time slots are dynamically assigned.

Time slots include ramp up and ramp down periods to minimize rapid changes in radio transmitter power. The ramp up and ramp down time to reduce unwanted radio emissions that occur from rapidly changing signals.

A single time slot transmission is called a radio burst. Four types of radio...