BBC2 ACCESS
BBC2 boards control VCCs used to transport the narrow band signaling and voice channels.

• Compressed voice channels are transported in ATM cells on AAL2 and are multiplexed or not,
• Narrow band signaling is transported through the ATM network by using the AAL5 services in a VCC.

The rate is 2 Mbit/s.

T0/T2 Access No.
Access identification No. (always 0).

Part
Selection via a menu:

• User
• Network No

This parameter shows if the BBC2 board is in User or Network mode with respect to the ATM switch. The parameter to be used is Network. User is used for testing.

Synchronisation Priority
YES: synchronization priority for the BBC2 board. Synchronization can be taken on the ATM link. The ATM cannot transport the synchronization (between 4400s).

ILMI Negotiation
This attribute must be set to NO.
YES: the ATM is built with the ILMI protocol.

Signalization Setting
YES: this attribute shows broadband signaling is established
NO: position to be used only for test requirements.

Flow Re-Negotiation
YES: the network provides rate re-negotiation, which allows rate to be optimized in the network by reusing silence cells (introduced by the VAD). Rate re-negotiation also allows the number of communications to be increased per VCC dynamically.
It is recommended to set to YES if there are several communications per VCC and to NO if there is only one.
This parameter must be set to NO (up to R4.1). Then, decision to be made.

SCR Sig/ATM (Kbit/s)
SCR Sig/Trunk Group (Kbit/s)
SCR Voice (Kbit/s)
PCR Sig/ATM (Kbit/s)
PCR Sig/Trunk Group (Kbit/s)
PCR Sig/Hyb. Link (Kbit/s)
Selection of medium and max. rate to be allocated per type of channels.
Modification of default values can only be performed by specialists.

MBS Sig ATM (cell number)
MBS TG (cell number)
MBS Link (cell number)
MBS Voice (cell number)
Number of max. cells per type of voice channel and signaling emitted during time slots to PCR via VpVc.
Modification of default values can only be performed by specialists.

End To End Transit Delay (ms)
Unused

Peak To Peak Cell Delay Var. (ms)
Unused
(Time when the traffic is max.)

Max PDU Control
Max PDU Data
Modification of default values can only be performed by specialists.

CC Timer
POLL Timer
NO RESPONSE Timer
KEEP ALIVE Timer
Inactivity Timer
SSCOP UU Size
Information Size
These attributes are linked to SSCOP. Modification of default values can only performed by specialists.

ATM User
USER part of the ATM address on 7 bytes.
Type the bbc2 -mao command to know the expected format.

ATM Network
Network part of the ATM address on 13 bytes.
Type the bbc2 -mao command to know the expected format.

ILMI Polling Timer
Active time-out if the ILMI Negotiation attribute is set to YES,

Scanning period of the MIB ILMI by the system.
Modification of default values can only be performed by specialists.
Setting is performed per number of units of 100 ms.

Comm. VCC Number
This attribute is active if Flow Re-Negotiation is set to YES (Unused)