Enterasys Networks CSX7000 User Manual download pdf (Page 192)

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USER’S GUIDE

192 CyberSWITCH

• IP Host (RFC 1294)

RFC 1294 provides a simple security exchange at connection time, along with an encapsulation

method for IP datagrams.

ASE DATA RATE

Only used for Dial-Out. This value represents the throughput on a B-channel or pre-ISDN link

connecting the CyberSWITCH to a device. The data rate can be specified as either 56,000 or 64,000

bps. The default configuration for the base data rate is 64,000 bps. If 64,000-bps connections to the

device are not possible, this value should be set at 56,000 bps.

NITIAL DATA RATE

Only used for Dial-Out. The initial data rate determines the bandwidth that will be attempted when

opening the first wide area connection. This provides you with a mechanism to request that a group

of parallel connections be made to a remote device rather than a single connection. This will allow

data to begin to flow at greater rates without waiting for the Throughput Monitor to detect an

overload condition. Calls will be made until an additional call would exceed the configured value.

The value is configured as a number from 2,400 to 1,024,000. For example, if you have configured

the Base Data Rate at 64 Kbps, and the Initial Data Rate at 256,000, the system would attempt to

initially use four calls (connections) running in parallel (256,000 / 64,000 = 4). The default

configuration for the Initial Data Rate is 64,000 bps.

AXIMUM DATA RATE

The Maximum Data Rate is used to limit the total number of channels that can be committed to a

single device (logical connection). This sets an upper boundary for line and capacity utilization.

This upper boundary allows you to keep one remote device from crowding out other devices and

using an unfair share of available resources. This parameter is enforced on inbound and outbound

calls. The system will not accept or make a call when the added bandwidth will exceed the

configured maximum. The value is configured as a number from 2,400 bps to 3,072,000 bps. You

may configure any value in this range. For example, if you have configured the base data rate at

64,000 bps, and the maximum data rate at 512,000 bps, the system would use a maximum of eight

calls (connections) running in parallel to open up bandwidth (512,000 / 64,000 = 8). The value need

not be a multiple of the Base Data Rate. The default configuration for the maximum data rate is

128,000 bps.

Note: A condition may occur in which the number of connections has reached the point where

the maximum data rate will be exceeded with the next additional connection, and yet the

remote device may initiate another call to the system. This inbound call causes the

maximum data rate to be exceeded and the system will drop a connection. If the remote

device is auto-dialing, this flip-flop condition will continue until you manually correct the

problem. To correct this problem, configure the Throughput Monitor information to be

identical on the CyberSWITCH and the remote device, or disable Throughput Monitoring

on one of the devices. The Internet Engineering Task Force (IETF) is working on a standard

solution to this problem.

If you are using multiple connections running in parallel (i.e., to the same device), the

maximum number of connections that can be aggregated is 32. For maximum performance,

however, we recommend aggregating no more than eight connections at a time.

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Enterasys Networks CSX7000 User Manual Page 192

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