CiM-550 IP Enabled Satellite Modem

Rev. 2

CLI and Telnet Interface

CD/CIM550.IOM

Menu Options/Fields

Entry

Description

 

 

packets for a route because of a lack in carrier

 

 

bandwidth. The Min Bandwidth is entered in multiples

 

 

of 8 Kbps.

 

 

 

Max Bandwidth

#

The Max bandwidth field establishes a hard maximum

 

 

traffic rate that can be processed by the CiM before it

 

 

starts to silently discard traffic. A value of 0 for this field

 

 

implies that no maximum limit is assigned to a route.

 

 

This value is entered in multiples of 8 Kbps.

Priority

#

Priority allows the user to specify a specific route to be

 

 

prioritized as either Priority 1 or Priority 2. Priority 1

 

 

was intended to be used when the route is servicing

 

 

traffic that requires as much latency and jitter

 

 

suppression as possible, for example RTP (voice)

 

 

traffic. All other traffic should be given Priority 2, to

 

 

ensure that mission critical traffic using Priority 1 will

 

 

have no performance degradation. Default value for

 

 

Prioity is 1.

 

 

NOTES on QoS and QoS Prioritization:

 

 

On input of Min B/W per route, please ensure SUM of

 

 

Min B/Ws do not exceed total modem Transmit

 

 

bandwidth. This is not automatically checked by CLI.

 

 

When a Min B/W is specified for any Priority 1 or

 

 

Priority 2 Route, All Priority 1 Max B/Ws are

 

 

automatically calculated and filled in based on the

 

 

following explanation:

 

 

The CLI sums all routes’ Min B/W (MINSUM) and then

 

 

calculates Excess Bandwidth = Total Modem Tx

 

 

Bandwidth - MINSUM

 

 

The Excess Bandwidth is then equally distributed

 

 

across the number of Priority 1 streams. That means

 

 

the Max B/W per Priority 1 stream is automatically filled

 

 

in as that specific route’s MIN plus the divided up

 

 

Excess Bandwidth.

 

 

This is done for two reasons:

 

 

If a Priority 1 route does not have a Max B/W limit, it

 

 

will take all excess bandwidth, starving any Priority 2

 

 

from its guaranteed MIN B/W. This ensures Priority 2

 

 

MIN B/W settings are honored.

 

 

To calculate for the administrator -- given all configured

 

 

Min B/Ws, total bandwidth of modem, and equally

 

 

distributed excess bandwidth across all Priority 1

 

 

routes -- what the Max B/W would be for each Priority 1

 

 

specific route.

 

 

Please note that when no MINs are specified the MAXs

 

 

are left at zero, meaning QoS is handled on a pure

 

 

priority basis.

 

 

Max/Min B/W settings are given in 1024 blocks. To

 

 

calculate the actual B/W setting simply multiple the

 

 

number shown by 1024. Alternatively note, that Tx

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