NETGEAR RT210, RT211 Subaddressing and Multiple Subscriber Numbering (MSN)

Reference Guide for the Model RT210/RT211 ISDN Routers

Configuring the Router 3-15

When you set the MinBandwidth parameter to a multiple of 64,000 bps, ISDN calls are made as

soon as the path is set up and until the bandwidth requirement is met.

The DemandThreshold parameter speciﬁes the percentage of current path usage when an

additional demand call must be made. To prevent calls from being made for short bursts of trafﬁc,

the percentage must be met for the period speciﬁed by ThresholdPd (Threshold Period).

For Bandwidth on Demand, the IdleThreshold parameter speciﬁes the percentage of usage below

which a demand call should be closed. The IdleThreshold must be met for the ThresholdPd.

Because of the packet splitting feature of the NETGEAR Model RT210 and Model RT211 ISDN

routers, there is always a small amount of data sent on the additional channel while data is being

sent on the original channel. To allow the path to fall back to only one channel, an IdleThreshold

value should be entered at which the channel is classed as unused. The original call is closed only

when no real data has been sent or received for the ThresholdPd.

You can conﬁgure MaxBandwidth in multiples of 64,000 bps. However, setting MaxBandwidth to

64,000 bps limits the path to only of the two ISDN ports.

If possible, these parameters should be set at one end only to avoid call collisions if both ends of

the path try to make calls at the same time.

Subaddressing and Multiple Subscriber Numbering (MSN)

If your NETGEAR Model RT210 ISDN router shares an ISDN line with other ISDN devices, the

router must identify where the incoming calls belong. Subaddressing and MSN are the two

methods for doing this and must be enabled by your ISDN provider. All ports must be conﬁgured

with the same values or the ports might answer calls that are not intended for the router.

The subaddress appears as a sufﬁx to an incoming ISDN number. In order for the router to

recognize the subaddress, it must be conﬁgured in the ISDN PORT form. The subaddress is

usually a single digit. Many ISDN providers preﬁx the subaddress with a zero. Check with your

supplier and enter the value in the correct format in the subaddress conﬁguration ﬁeld.

If the router has no subaddress conﬁgured, it answers any incoming subaddressed call. To make a

call to a router that has a subaddress conﬁgured, use the ISDN number followed by the * symbol

and the subaddress number. Do not include any extra digits that the ISDN service adds to the

subaddress.

NGRRT210.BK Page 15 Friday, October 17, 1997 2:37 PM