Available Rate On The Transmission Media - Cisco D9054 Installation And Operation Manual

Available Rate on the Transmission Media

ASI
The rate of the ASI output is set up by the user to match the transmission media or
any other device to follow the D9054 HD Encoder.
The maximum available transport stream rate is limited by the hardware. The
maximum transport stream rate of the D9054 HD Encoder is 120 Mbit/s output.
Note: When you select the 204
stream rate is reduced to 188/204 of the specified transport stream rate.
Satellite Interfaces
A satellite modulator may be connected to the ASI output of the D9054 HD
Encoder. The available transport stream rate on the satellite link depends on the
modulation, the symbol rate (= Baud rate) and the code rate according to the
following formula:
Transport stream rate = Rs * 188/204 * code rate * n
where:
Rs is the symbol rate in MBaud or Msymbols/sec,
the 188/204 refers to the outer Reed-Solomon coding in the modulator,
n = 2 for QPSK, 3 for 8PSK and 4 for 16QAM,
and the code rate is the rate of the inner coding (1/2, 2/3, 3/4, 5/6 and 7/8).
The transport stream rate of the D9054 HD Encoder shall be set up to equal the rate
calculated by the formula above. Remember to disable the RS in the D9054 HD
Encoder
The maximum transport stream rate is determined by the ASI interface, or the
satellite modulator, whichever is lowest. Note that satellite modulators often have a
minimum transport stream rate that is much higher than the minimum transport
stream rate of the D9054 HD Encoder.
Note: 10 Mbaud gives the following transport stream rate with 8PSK modulation
with 7/8 code rate:
10 Mbaud * 188/204 * 7/8 *3 = 24.9 Mbit/s
2) 204 bytes mode is not applicable to the PNC Control System.
B-10
2)
D9054 HDTV Encoder Installation and Operation Guide
byte format without RS the payload transport
4038938 Rev A