TSAT 3000 - Telemetry and data transfer via SATellite
TSAT 3000 Configuration Parameter Description, January 2013 Page 27 of 124
• HUB Ù RT Leased Line
HUB:
PORT_STREAM_RT = RT, BROADCAST, GROUP or CLUSTER.
PORT_STREAM_RT_PORT = PORT(s) at RT.
RT: PORT_STREAM_RT = HUB.
PORT_STREAM_RT_PORT = Don’t care.
Ver <= 30.1.1: Leased Line to GROUP or CLUSTER doesn’t work correctly. USER_DATA
will be sent from HUB to the indicated GROUP or CLUSTER, but USER_DATA from
RTs will not
be sent back to this PORT. They will be sent to all SERVICE PORTs (i.e.
NMS).
Ver >= 30.2.0: All RTs will signal GROUP membership (i.e. NET_GROUPS [1…5]) and
CLUSTER address (i.e.
NET_FIRST_POLL_RT) back to HUB in POLL_ACK packets.
HUB will save this information and use it to decide to which PORT data from RT
shall be transmitted (based on RT address and
PORT_STREAM_RT [n]).
You can see when this information is changed on the HUB by enable bit 27
(0x0800.0000 –
DEBUG_ADDR) in UTL_DEBUG_MASK.
Note 1: Minimum PKT_INBOUND_SIZE is increased from 16 to 24 bytes, because
size of
POLL_ACK packet is increased.
Note 2: In large networks, it could take long time from RT is configured with GROUP
membership until this information is signalled back to HUB.
POLL_ACK packet is
returned to HUB when RT is polled (HUB is requesting RT in
SYNC packet), and
it doesn’t have any
USER_DATA to send. RTs Ver <= 30.1.1 would never reply
with POLL_ACK if they always
had USER_DATA to send. RTs Ver >= 30.2.0 will
reply with
POLL_ACK at least each 10
th
time it’s polled.
Example: 100 RTs, 16 Slots-in-Frame, 64 kbps, 100 bytes (Slot 13.6 ms).
Max Time: 13.6 x (16+1) x 100 x 10 = 231200 ms = 3 min 51 sec.
Normal Average: 13.6 x (16+1) x 50 = 11560 ms = 12 sec.
• HUB Ù RT – IP Routed Line
PORT_STREAM_RT value –1 will have different interpretation on the HUB, depending on
Version and
PORT_TYPE [n]:
HUB Ver <= 30.3.1 or PORT_TYPE <> NETWORK.
Local Leased Line
– Loop data within the HUB Main-Unit.
HUB Ver >= 30.4.0 and PORT_TYPE = NETWORK.
IP Routed Line
– Send IP-packet directly to the RT indicated by the IP-packet’s
destination MAC-Address. The MAC-Address is actually the 16 lower bits of RT’s
IP_ADDRESS_SAT
, and HUB know about these addresses since RT Ver >= 30.4.0 will
signal its own MAC address back to HUB in
POLL_ACK packets. If HUB for some reason
doesn’t know the RT’s MAC-Address (I.e. RT Ver <= 30.3.1), the IP-packet will be
BROADCAST to all RTs.
When “IP Routed Line” is enabled, it’s also possible to enable the “Secure Link Facility”
for Outbound
IP-packets. See PORT_MAX_APPL_RETRIES [n].
Note 1: Minimum PKT_INBOUND_SIZE is increased from 24 to 26 bytes, because size of
POLL_ACK packet is increased.
Note 2: In large networks … (see Note 2 in section above).
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