Comtech EF Data CIM-300L - Manual (Page 174)

CiM-300L IP Enabled Satellite Modem Rev. 1
CLI & Telnet CD/CIM300L.IOM
148
Menu Options/Fields Entry Description
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.
1. 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:
a. The CLI sums all routes' Min B/W (MINsuM) and
then calculates Excess Bandwidth = Total
Modem Tx Bandwidth - MINsuM
b. 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:
a. 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.
b. 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.
2. 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
Modem Data Rate is given in true 1 K blocks (56K
is truly 56Kbps).