Specifications

UHP-1000 SATELLITE ROUTER

INSTALLATION AND OPERATION MANUAL, V. 2.5

(SW VERSION 2.5.X)

2.9 Automatic Transmission Level Control (TLC) for SCPC

The level of transmission of point-to-point SCPC links can be automatically adjusted to ensure proper reception of

the receiving side of the link. The predefined level set on receiving station is continuously compared with current

level and transmitting site in notified about such difference. Is TLC feature is activated on transmitting site it will

try to adjust the level to ensure optimal level of reception on the receiving site. TLC can be activated for both or

just one direction of duplex SCPC link.

In contrast to TLC in the TDM/TDMA networks and HUBLESS TDMA, SCPC TLC parameters are transmitted between

stations over UDP, which allows you to send them both via satellite and by terrestrial networks.

SCPC TLC configuration commands:

---------- SCPC TLC mode

tlc mode off|on - Mode control

Activation of TLC mode.

tlc peer IP_ADDR 0-1020 STRING - Peer IP address, VLAN, password

Remote IP address, local VLAN and password (use the same password on both ends).

tlc nominal 20-200 - Desired local receive level (x 0.1dB)

Desired (target) reception level.

“show tlc” command retrieves actual settings and statistics:

UHP# show tlc

TX_Mode: OFF TX_Peer: 0.0.0.0 VLAN: 0 Nom.: 8.0 TX_Cor: 0.0

RX_pkts: 0 RX_Peer: 0.0.0.0 Last: +00:21:18 RX_Cor: N/A

Link statistics represent status of exchange between the stations and suggested correction of the level.

2.10 IP traffic processing and routing

2.10.1 SVLAN overview

UHP-1000 routers make use of a special protocol to transmit information via the satellite. Requirements to such

protocol are minimal overhead and a possibility to split and group data streams. With the UHP-1000 routers, this

protocol is named SVLAN.

SVLAN channels are similar to the VLAN notion in Ethernet but it is simpler – it is just ”pipes” with numbers. If you

send traffic into such a pipe (SVLAN) at the modulator, then at the other link end you will receive these packets to

be dealt with by the IP-router, provided you set the same SVLAN number for reception.

SVLAN with number 0 differs from others by that traffic through it is transmitted without additional headers at all,

thus providing the highest transmission efficiency. The rest SVLAN (1-1020) add two bytes to each packet.

Into one SVLAN one can, using router facilities, route the required number of networks, each of them having its

own priority level.

2.10.2 IP-router

UHP-1000 routers implement a standard IP-router supporting static routing. The routing table can contain the

following records:

 IP-address on LAN

 Statistical route in the LAN direction

 IP-map – a route to the modulator in SVLAN

 SVLAN Receive – a command to receive SVLAN from one of the demodulators

Records in the Table are arranged according to the network mask. The first ones are records with mask /32. Any of

the records can contain VLAN and then it is referred to the Table of the relevant VLAN and will work only in it.