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Question about iDirect 3100 Option file

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tech-vsat
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Mar 29th, 2009 at 12:49pm  
Hello,

I have question about Idirect Modem Option file. I would want to know the Symbol Rate and Receive frequncy.

Lets say I have one Option file for one Idirect modem and might be there some problem that I can not Point the antenna through ISITE....  how should I find the symbol rate and Frequncy to Point the antenna with Satellite Meter.


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« Last Edit: May 11th, 2018 at 3:18pm by Admin1 »  
 
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Reply #1 - Mar 29th, 2009 at 1:34pm  
[MODEM_PARAMETERS]
rx_freq = 1213000000
rx_acqrange = 100000
rx_bitrate = 4097132
rx_mode = 2
rx_modtype = 1
rx_fecrate = 20
rx_scram = 1
rx_diff = 0
rx_specinv = 0
tx_freq = 1000000000
tx_bitrate = 2048075
tx_mode = 0
tx_modtype = 1
tx_clksource = 0
tx_fecrate = 15
tx_scram = 1
tx_diff = 0
tx_specinv = 0
tx_power_in_dbm = -15.000000
rx_fsd = 156929
tx_spreading_factor = 1
rx_spreading_factor = 1
tx_spread_enable = 0
rx_spread_enable = 0
is_demod2_active = 0
rx_symrate = 3841999.238095
tx_symrate = 1291000

Rx_bitrate sets the units data rate in bits per second. That value reflects the payload's coded rate.
BitRate = (Desired Symbol Rate) x (Modulation Factor) x (Coding Rate)
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tech-vsat
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Reply #2 - Mar 29th, 2009 at 1:51pm  
Hi Mike

As per below example. Let say I want point or track it by Horizon satellite meter. How should I put freq and symbol rate on it.

[MODEM_PARAMETERS]
rx_freq = 1213000000
rx_acqrange = 100000
rx_bitrate = 4097132

Thanks in advance
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Eric Johnston
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Reply #3 - Mar 29th, 2009 at 5:44pm  
The long [MODEM PARAMETERS] listing above is interesting as is also shows the calculated rx and tx symbol rates.

I would guess that rx_modtype = 1 means QPSK or 2 bits per symbol

But what does rx_fecrate = 20 mean ?

Well 1 / ( 3841999 x 2 /4097132 ) = 0.533 which is one of the listed FEC rates. So rx_fecrate = 20 means 0.533 FEC.

Look for a carrier with 3.842 Msps symbol rate with a Horizon meter. The receive frequency in the cable will be 1213 MHz.  On a spectrum analyser the top of the carrier will about 3.842 MHz wide and the width overall about 1.35 to 1.4 times this or about 5.2 MHz occupied transponder bandwidth.

I've not seen options file examples before which include the rx_symrate and tx_symrate shown.

Best regards, Eric.
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Reply #4 - Mar 29th, 2009 at 9:23pm  
QPSK is correct.

rx_modtype:

0 = BPSK
1 = QPSK
2 = 8PSK
3 = 16 PSK
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Reply #5 - Mar 30th, 2009 at 8:17am  
Mike has told me:

8.2.2 and above options files specify the symbol rates on the tail end of the [MODEM PARAMETERS]

I have edited the above messages to make the number of zeros in the frequency correct.

Best regards, Eric.
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tech-vsat
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Reply #6 - Mar 30th, 2009 at 11:36am  
Hi,

Lets give us the Example of below  Option file, which I am looking for........

[OPTIONS_FILE]
     modem_sn = 108714
     modem_type = Remote
     modem_hardware = 3100
     did = 5089450
     generated_by = NMS version $Name: NetModem-7_0_2 $
     is_mesh = 0

[SECURITY]
     password = $
     admin_password = $

[NMS]
     timeout = 20000
     server_ip = XXXXXXXXXX
     broadcast_ip = XXXXXXXXXX
     keep_alive_port_number = 2860
     NRD_server_ip = 192.168.204.132
     NRD_remote_status_port_number = 2859
     service_monitor_interval = 1000
     download_monitor_group = 239.192.0.0
     download_monitor_port = 9000
     download_monitor_credentials = 1
     is_nms_managed = 1

[VLAN]
     mode = 0
     vid = 1

[ETH0_1]
     address = XXXXXXXXXXX
     netmask = 255.255.255.248
     rip_enabled = 1

[DNS]
     dns_enable = 1
     dns_cache_enable = 1
     dns_cache_size = 100
     dns_cache_ttl_min = 300
     dns_cache_ttl_max = 86400
     dns_forward_queue_size = 1000
     dns_forward_timeout = 2000
     dns_primary_server_name = ns1
     dns_primary_server_addr = 217.10.162.8
     dns_secondary_server_name = ns2
     dns_secondary_server_addr = 217.10.160.8

[ROUTE_1_0]
     interface = sat0
     network = 0.0.0.0
     netmask = 0.0.0.0
     gateway = 0.0.0.0
     metric = 1

[SAT0_1]
     address = 10.0.1.58
     netmask = 255.255.255.0
     rip_enabled = 1

[ETH0]
     interface = ixp0
     phy_count = 1

[LAN]
     lan_ip = 125.213.202.97
     lan_subnet_ip = 255.255.255.248
     lan_gw_ip = 0.0.0.0

[MODEM_PARAMETERS]
     data_port = 0
     loopback = 0
     interface_type = 0
     rx_freq = 1628059999
     rx_acqrange = 1800000
     rx_bitrate = 7923077
     rx_mode = 2
     rx_modtype = 1
     rx_fecrate = 15
     rx_scram = 1
     rx_diff = 0
     rx_specinv = 0
     tx_freq = 1000000000
     tx_bitrate = 1012759
     tx_mode = 0
     tx_modtype = 1
     tx_clksource = 0
     tx_fecrate = 15
     tx_scram = 1
     tx_diff = 0
     tx_specinv = 0
     tx_power_in_dbm = -9.000000
     rx_fsd = 4044
     is_demod2_active = 0

[ACQUISITION_PARAMETERS]
     fsd = 72828

[UCP]
     power_uplink_control_processing = 1
     max_power_level_in_db = -5.000000

[ODU]
     music_present = 0
     odu_rx_dc_power = 1
     odu_rx_10_mhz = 0
     odu_tx_dc_power = 1
     odu_tx_10_mhz = 1
     odu_disable_tx_pwm = 0

[TDMA]
     tx_watchdog_timeout_in_frames = 2

[TIMEPLAN]
     fec_blocks_per_outroute_frame = 305
     symbols_per_inroute_frame = 79847
     outroute_fec_block_len = 512
     outroute_fec_type = 793
     inroute_fec_block_len = 512
     inroute_fec_type = 793
     unique_word_len = 32
     symbols_per_outroute_frame = 624671
     num_acq_slots = 1
     aperture_traffic = 8
     aperture_acq = 1095
     num_traffic_slots = 36
     payload = 2048
     skip_slots = 2

[LL]
     ll_open_active = 1
     ll_tx_window = 1024
     ll_rx_window_backoff = 102
     ll_rx_window = 1024
     ll_t1_timeout = 4000
     ll_t2_timeout = 1000
     ll_t3_timeout = 5000
     ll_t4_timeout = 1500
     ll_t1_retry_limit = 5

[SPOOF]
     spoof_debug_level = 0
     spoof_passthru = 0
     spoof_timeout = 100
     spoof_oos_buffer_size = 64240
     spoof_keepalive_timeout_ms = 6000
     spoof_fwd_ack_ms_timeout = 200
     spoof_fade_timeout = 120000
     spoof_reap_timeout = 480000
     spoof_syn_timeout = 120000
     spoof_max_sessions = -1
     spoof_accel_connect = 1
     spoof_accel_port = 80
     spoof_retx_buffer_size = 105605
     spoof_peer_retx_buffer_size = 93087
     spoof_merge_on = 0
     spoof_compression_on = 0

[MODEM_INSTALLATION]
     hub_lat = 52.238000
     hub_long = 359.517000
     remote_lat = 34.320000
     remote_long = 69.100000
     spacecraft_long = 53.000000
     reflector_offset_angle = 22.600000

[FREQ_TRANS]
     down_translation = 10000.000000
     up_translation = 13050.000000

[DEBUG]
     cpu_util_test_enabled = 0

[GUI_SERVER_PROXY]
     port = 14599

[SAR]
     tx_segment_size = 70
     tx_passthru = 0
     rx_passthru = 1

[SERVICE_LEVEL_0]
     name = DEFAULT
     type = cost_based
     cost = 0.500000
     max_depth_packets = 564
     max_depth_bytes = 28206
     max_depth_ms = 250
     drop_oldest_uis_first = 1
     rt_weight = 0.000000
     cir_trigger = 1

[SERVICE_LEVEL_1]
     name = NMS_TCP
     type = priority
     priority_min = 76
     priority_max = 100
     priority_step = 1
     max_depth_packets = 250
     max_depth_bytes = 3004
     max_depth_ms = 20
     drop_oldest_uis_first = 1
     rt_weight = 0.000000
     cir_trigger = 0

[SERVICE_LEVEL_1_RULE_1]
     PROTOCOL = EQUAL 6
     DEST_IP_ADDR = EQUAL 192.168.204.132

[SERVICE_LEVEL_2]
     name = NMS_UDP
     type = priority
     priority_min = 76
     priority_max = 100
     priority_step = 1
     max_depth_packets = 564
     max_depth_bytes = 28206
     max_depth_ms = 250
     drop_oldest_uis_first = 1
     rt_weight = 0.000000
     cir_trigger = 0

[SERVICE_LEVEL_2_RULE_1]
     PROTOCOL = EQUAL 17
     DEST_IP_ADDR = EQUAL 192.168.204.132

[SERVICE_LEVEL_3]
     name = NMS_ICMP
     type = priority
     priority_min = 76
     priority_max = 100
     priority_step = 1
     max_depth_packets = 564
     max_depth_bytes = 28206
     max_depth_ms = 250
     drop_oldest_uis_first = 1
     rt_weight = 0.000000
     cir_trigger = 0

[SERVICE_LEVEL_3_RULE_1]
     PROTOCOL = EQUAL 1
     DEST_IP_ADDR = EQUAL 192.168.204.132

[SERVICE_LEVEL_4]
     name = UDP
     type = cost_based
     cost = 0.100000
     max_depth_packets = 564
     max_depth_bytes = 28206
     max_depth_ms = 250
     drop_oldest_uis_first = 1
     rt_weight = 0.000000
     cir_trigger = 1

[SERVICE_LEVEL_4_RULE_1]
     PROTOCOL = EQUAL 17

[SERVICE_LEVEL_5]
     name = TCP
     type = cost_based
     cost = 0.500000
     max_depth_packets = 250
     max_depth_bytes = 3004
     max_depth_ms = 20
     drop_oldest_uis_first = 1
     rt_weight = 0.000000
     cir_trigger = 1

[SERVICE_LEVEL_5_RULE_1]
     PROTOCOL = EQUAL 6

[ENC]
     id = 5089450
     is_encrypted = 0
     enc_algorithm = dynamic
     enc_algorithm_mode = dynamic

[NET_ENC]
     id = 1
     is_encrypted = 0

[UDP]
     passthru = 1
     force_udp_fullheader = 1
     force_rtp_fullheader = 1
     payload_comp = 0
     max_hdr_comp_packet_size = 180

[COMPRESSION]
     Threshold = 90

[PAD]
     partial_passthru = 0

[OOB]
     mem_low_percent = 75
     mem_high_percent = 90

[TX]
     device_path = /dev
     device_mode = tdma
     device_name = tx

[RX1]
     device_path = /dev
     device_mode = scpc
     device_name = rx1

[BTP]
     device_path = /dev
     device_mode = tdma
     device_name = btp

[SOF]
     device_path = /dev
     device_mode = tdma
     device_name = sof

[SATELLITE]
     min_look_angle = 0.000000

[SYSTEM_TRAY]
     mode = 1
     server = 192.168.204.132
     port = 2859
     interval = 5000
     service_monitor_group = 239.255.255.1
     service_monitor_port = 9001

Thanks in Advance  for Helping  

[ edited by form admin: passwords removed ]


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Reply #7 - Mar 30th, 2009 at 11:46am  
We need to find out what fecrate = 15 means.

Does anyone with an 8.2.2 have an options file and fecrate = 15.  If so what are your rx_bitrate, rx_modtype, and rx_symrate ?  

From that we can work out what fecrate = 15 means and from that what the symbol rate is for a pre 8.2.2 options file with fecrate = 15.

Best regards, Eric.
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Reply #8 - Mar 30th, 2009 at 12:09pm  
15 is normally indicative of long block 3249/4096. Possibly .495.....Give me some time and I will run it to ground.

M
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tech-vsat
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Reply #9 - Apr 1st, 2009 at 9:09am  

Hi Mike,


Still waiting for the Positive answer. Hope to get it soon
.

Appreciate you’re Cooperation in Advance


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Eric Johnston
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Reply #10 - Apr 2nd, 2009 at 2:59pm  
I've solved it.  Just seen someones option file and screen display.

FEC code 15 means 3249/4096 = 0.793

So anyone can now work out symbol rate is they are less than 8.2.2 using:

rx_modtype:
0 = BPSK
1 = QPSK
2 = 8PSK
3 = 16 PSK

rx_fecrate
15 = 0.793
20 = 0.533

Best regards, Eric.
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« Last Edit: Apr 2nd, 2009 at 7:12pm by Eric Johnston »  
 
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