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SAT>IP URL Builder & T2-MI / MPS Decapsulation

Quick reference guide to SAT>IP URL construction, multistream parameters, and T2-MI configuration

2026-03-19 14:57
2026-07-21 11:42

SATLINE · Documentation

Quick reference — URL construction, multistream parameters, and automatic T2-MI / MPS decapsulation.

Published 2026-03-19 · Updated 2026-07-18 · Applies to SAT>IP Server Pro v3.0.0+

New

T2-MI and MPS are now decapsulated server-side. Add t2mi_pid=auto (or mps_pid=…) and the server returns a ready-to-play inner TS over HTTP/RTSP/SRT. The old workflow (raw stream → external Astra-SM) is no longer required.

Basic SAT>IP Parameters

Essential parameters for standard DVB-S/S2 transponders.

Parameter	Description	Example values
`freq`	Frequency in MHz	10700–12750 (Ku-band)
`pol`	Polarization	v (vertical) / h (horizontal)
`sr`	Symbol rate in kSym/s	22000, 27500, 30000
`msys`	Delivery system	dvbs, dvbs2, dvbt, dvbt2
`mtype`	Modulation	qpsk, 8psk, 16apsk, 32apsk
`fec`	Forward error correction	12, 23, 34, 45, 56, 89, 910

Basic URL

http://SERVER:8875/?src=1&freq=11727&pol=v&sr=30000&msys=dvbs2&mtype=8psk&fec=34&pids=all

FEC notation

Two digits = numerator/denominator: 34 = 3/4, 910 = 9/10. Higher (8/9, 9/10) = more usable bandwidth but needs a stronger signal; lower (1/2, 2/3) = more error protection.

Multistream Parameters

ISI & PLS codes for DVB-S2/S2X multistream.

ISI — Input Stream Identifier

Range 0–255
Selects one stream from a multistream carrier
Example: isi=9

PLS — Physical Layer Scrambling

plsc range 0–262143
plsm = gold / root / combo
Example: plsm=gold&plsc=131070
Gold ≡ root (e.g. gold 131070 = root 16416)

Multistream (ISI)

http://SERVER:8875/?src=1&freq=12536&pol=h&sr=35300&msys=dvbs2&mtype=8psk&fec=23&isi=9&pids=all

Parameter is plsm (not pls). Check LyngSat/KingOfSat for the correct ISI/PLS per transponder.

T2-MI Configuration

DVB-T2 encapsulated in DVB-S2 — decapsulated automatically.

Parameter	Description	Values
`t2mi_pid`	Outer PID carrying T2-MI	`auto` (tries 4096→4095) or a PID
`t2mi_plp`	Inner DVB-T2 PLP to extract	`0` (default), `auto` (first data PLP), `all` (merge every PLP)
`t2mi_pids`	PID filter on the inner TS	`all` (default) or CSV
`bbframe`	Raw BBFrame mode (STiD135 chipset) for MIS T2-MI the demod drops in hardware	`1` to enable (needs the raw-bbframe driver patch; use with `pids=all` + `t2mi_pid`)

How it works

The server decapsulates T2-MI and outputs the inner DVB-T2 TS — ready to play. Works over HTTP, RTSP and SRT.
Use t2mi_plp=all if the picture is present but the channel list (PSI) is missing — it merges the common PSI PLP with the data PLPs.
Only add T2-MI parameters for feeds that actually use T2-MI.
If a multistream (MIS) T2-MI feed is glitchy or undecodable despite a good signal on STiD135-based hardware, add bbframe=1 (with plsm=gold&plsc=<code>). The demod then emits raw DVB-S2 BBFrames and the server rebuilds the stream losslessly before decapsulating — fixing feeds the demod otherwise drops ~9% of.

T2-MI — fully automatic

http://SERVER:8875/?src=1&freq=11727&pol=v&sr=30000&msys=dvbs2&mtype=8psk&fec=34&pids=all&t2mi_pid=auto&t2mi_plp=auto

T2-MI — raw BBFrame mode (RAI 4K, 5°W)

http://SERVER:8875/?src=1&freq=12606&pol=v&msys=dvbs2&mtype=8psk&sr=35300&fec=23&ro=0.35&isi=5&plsm=gold&plsc=131070&bbframe=1&pids=all&t2mi_pid=4096&t2mi_plp=0

mps_pid

mps_sid

inner_sid

inner_pids

MPS — nested TS

http://SERVER:8875/?src=1&freq=12226&pol=v&sr=30000&msys=dvbs2&mtype=8psk&fec=56&isi=20&pids=all&mps_pid=8001&inner_sid=1

Encrypted Feeds

Decapsulation is not decryption.

Scrambled content needs keys

The server unwraps the container, but a scrambled inner stream still needs the correct keys — a BISS key (biss=) or an authorized CAM/subscription. Without keys, a perfectly-locked channel stays blank.

Complete URL Examples

Standard DVB-S2 · Astra 19.2°E 11.954 H

http://SERVER:8875/?src=1&freq=11954&pol=h&sr=27500&msys=dvbs2&mtype=8psk&fec=34&pids=all

Multistream ISI · Eutelsat 5°W 12.536 H

http://SERVER:8875/?src=1&freq=12536&pol=h&sr=35300&msys=dvbs2&mtype=8psk&fec=23&isi=9&pids=all

Multistream PLS · gold 131070

http://SERVER:8875/?src=1&freq=11470&pol=v&sr=27500&msys=dvbs2&mtype=8psk&fec=34&plsm=gold&plsc=131070&pids=all

T2-MI · automatic

http://SERVER:8875/?src=1&freq=11727&pol=v&sr=30000&msys=dvbs2&mtype=8psk&fec=34&pids=all&t2mi_pid=auto&t2mi_plp=auto

Troubleshooting

Common mistakes

Wrong frequency (check LyngSat)
Wrong polarization (V vs H)
Symbol-rate typo (27500 vs 2750)
FEC mismatch (34 vs 23)
T2-MI syntax: use t2mi_pid= query params, not a # fragment
Scrambling: plsm, not pls; gold vs root

Diagnostic steps

Verify against LyngSat / KingOfSat
Start basic, add parameters one at a time
For T2-MI use t2mi_pid=auto + t2mi_plp=auto
Picture but no channels → t2mi_plp=all
Nothing plays → check SNR in the dashboard

Signal quality

Advanced modulation (16/32/256APSK) and high FEC (8/9, 9/10) need excellent signal. Check SNR / strength in the SATLINE dashboard.

Gleb Sazanov

Chief Technology Officer at SATLINE

Gleb Sazanov is an accomplished Chief Technology Officer (CTO) with over 20 years of experience in software development, system architecture, and cloud-based solutions. As the CTO of SATLINE, a leading provider of virtual and colocation services tailored to SATCOM businesses, Gleb drives the company’s technological strategy, fostering innovation and efficiency in data center services. His expertise spans various domains, including DevOps, system scaling, and high-performance infrastructure management. With a deep passion for cutting-edge technologies, Gleb plays a pivotal role in shaping the future of the SATCOM industry.

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