Chap Challenge Interval (secs)

Default = 0 (disabled). Range = 0 to 99999 seconds. The period between CHAP challenges. Blank or 0 disables repeated challenges.

Bi-Directional Chap

Default =Off.

Header Compression

Default = None selected

Enables the negotiation and use of IP Header Compression. Supported modes are IPHC and VJ. IPHC should be used on WAN links.

PPP Compression Mode

Default = MPPC

Enables the negotiate and use of compression. Do not use on VoIP WAN links. The options are:

• Disable Do not use or attempt to use compression.

• StacLZS Attempt to use STAC compression (Mode 3, sequence check mode).

• MPPC Attempt to use MPPC compression. Useful for NT Servers.

PPP Callback Mode

Default = Disabled.

The options are:

• Disable Callback is not enabled

• LCP (Link Control Protocol) After authentication the incoming call is dropped and an outgoing call to the number configured in the Service is made to re-establish the link.

• Callback CP (Microsoft's Callback Control Protocol) After acceptance from both ends the incoming call is dropped and an outgoing call to the number configured in the Service is made to re-establish the link.

• Extended CBCP (Extended Callback Control Protocol) Similar to Callback CP except the Microsoft application at the remote end prompts for a telephone number. An outgoing call is then made to that number to re-establish the link.

PPP Access Mode

Default = Digital64

Sets the protocol, line speed and connection request type used when making outgoing calls. Incoming calls are automatically handled (see RAS services). The options are:

• Digital64 Protocol set to Sync PPP, rate 64000 bps, call presented to local exchange as a "Data Call".

• Digital56 As above but rate 56000 bps.

• Voice56 As above but call is presented to local exchange as a "Voice Call".

• V120 Protocol set to Async PPP, rate V.120, call presented to local exchange as a "Data Call". This mode runs at up to 64K per channel but has a higher Protocol overhead than pure 64K operation. Used for some bulletin board systems as it allows the destination end to run at a different asynchronous speed to the calling end.

• V110 Protocol is set to Async PPP, rate V.110. This runs at 9600 bps, call is presented to local exchange as a "Data Call". It is ideal for some bulletin boards.

• Modem Allows Asynchronous PPP to run over an auto-adapting Modem to a service provider (requires a Modem2 card in the main unit)

Data Pkt. Size

Default = 0. Range = 0 to 2048.

Sets the size limit for the Maximum Transmissible Unit.

BACP

Default = Off.

Enables the negotiation and use of BACP/BCP protocols. These are used to control the addition of B channels to increase bandwidth.

Incoming traffic does not keep link up

Default = On.

When enabled, the link is not kept up for incoming traffic only.

Multilink/QoS

Default = Off.

Enables the negotiation and use of Multilink protocol (MPPC) on links into this Service. Multilink must be enabled if there is more than one channel that is allowed to be Bundled/Multilinked to this RAS Service.