Chapter 4 - AT Commands, S-Registers, and Result Codes

 

 

 

S-register:

S63

 

Function:

Bandwidth-on-Demand Low Throughput Threshold

Unit:

Kbps

 

Range:

n=0–64 (Kbps)

Default:

26 (26 Kbps)

Description: Sets BOD Low Throughput Threshold, which determines whether second

 

channel should be disconnected due to low throughput. Refer to the BOD

 

description and how the Low Throughput Threshold (S63) and Low

 

Threshold Sampling Period (S62) determine when second channel should be

 

disconnected. By default, the average throughput during the Low Threshold

 

Sampling Period (S62) must be equal to or less than 26 Kbps.

S-register:

S64

 

Function:

Call Bumping (CB)

Unit:

Decimal ASCII code

Range:

n=0

Disable

 

n=1

Enable

Default:

1 (Enable)

Description: Enables the Call Bumping feature of Dynamic Bandwidth Allocation. With

 

Call Bumping disabled, incoming and outgoing calls are not possible if both

 

B-channels are already in use. With Call Bumping enabled, incoming and

 

outgoing analog calls through the POTS port are possible even if both B-

 

channels are in use. If the TA is acting as a host device, Call Bumping is

 

available to the host TA only if MP+ (S59=1) was negotiated by both the

 

client and the host. Also, Call Bumping is not available to the host TA if the

 

Dynamic Bandwidth Allocation scheme is MP+ (S59=1) and MP+ negotiation

 

fails. If MP+ negotiation was successful (meaning both client and host

 

support MP+), Call Bumping is available to the host TA. By default, Call

 

Bumping is enabled.

 

Note: If using the TA as a host for MultiLink PPP calls with the MP+ Dynamic

 

Bandwidth Allocation scheme (S59=1), Data DN/MSN 2 must be entered.

S-register:

S65

 

Function:

POTS Call Bump Forwarding Delay

Unit:

5 ms

 

Range:

n=0-255 (0 ms to 1275 ms)

Default:

20 (100 ms delay)

Description: Allows the forwarding delay time to be adjusted. Some central office switches are not able to accept another call immediately after tearing down a call (meaning the TA is able to tear down a call and initiate another call much faster than the central office). If the central office switch is too slow, then a Call Bump (due to an incoming or outgoing analog call) will not be recognized and the analog device will not ring (if incoming) or will not give a dial tone (if outgoing). A delay of 100 ms is the default, which should allow enough time for the central office switch to prepare for new calls.

S-register: S66

Function: Country Selections for POTS Ring Signal

Unit: Decimal ASCII code

Range: n=0–27

0Default

1Custom single

2Custom dual

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