- This topic has 62 replies, 1 voice, and was last updated 4 years, 8 months ago by
.
-
Posts
-
hy fellows can any U please find answer of my simple question…?
Q—> Whats is the data rate of Um Air Interfacein of GSM…?
Q—> Which specific protocols used in NGN architecture..?
Many Thankx..!
Q1 –> one timeslot on the air interface for GSM carries up to 22.8 kbps of ‘raw’ data in GSMK modulation (voice or GPRS), and up to 55kbps in 8PSK modulation (EDGE).
one user can get up to n timeslots when transferring data (GPRS / EDGE), depending on the class of the mobile. It is usually 4 timeslots… so the data rate can reach 220kbps in excellent condition. In urban environment, one user can usually expect 180kbps (outside busy hours).
Q2 –> i don’t know about NSS, sorry…
the main prorool used in NGN are
1. The SIP or H323 protocolfor signaling between two Softswitch.
2. The MGCP or H248 to control MGW.
3.The Sigtran in order to carry the SS7 message over the IP network.Thx alot Pix….! 🙂
hi everyone,can any one tell me why a site gets intermittent every now and then…even the technicans from erricssion cannot solve this issue and its exactly one month.
please assist with some hintsWhat is the frequency used in CDMA
cdma
uplink 824-849mhz
downlink869-894mhz
carrier frq 1.25mhzwhat is downlink frequency of 1900 mhz.
WHY IS THE UPLINK FREQUENCY LOWER THAN THE DOWNLINK FREQUENCY IN CDMA?
IS THERE ANY OTHER REASON EXCEPT THE POWER TRANSMITTING CAPABILITIES OF MOBILE SET AND THE BASE STATION?
PLEASE CLEARIFYwhat are the major drawbacks associated with the 6/4 GHz band used for up-link /down-link transmission in a satellite communication link?
wat is the exact uplink and downlink frequency
for GSM-1900
downlink freq=1710-1785MHz
uplink freq=1805-1880MHzhi friends,
why downlink frequency is greater than uplink frequency in GSM bands?since lower frequency transmitted by the handset ,it can go to higher distance with low power. low power is important bcoz’ it’s battery power equipment.
need a uplink & downlink frequency
