MTP2 TXC Configuration Bytes (ITU/ANSI)

Byte

Description

Value

0x01

LSSU size

0x01 to 0x02
default = 0x01

0x02

Mode

0x00=Basic (default)

0x01=PCR

0x02=Japan TTC

0x03

RTB size in SUs

0x01–0x7F (127)
default is 0x38 for Japan variants
default=0x7F for non-Japan variants

0x04-0x05

N2 Parameter Value (RTB byte size limit)

0x0117 –0xFFFF (279–65535) default=0xFFFF

0x06

Additional Interframe Flags

0x00–0xFF (default=0x00)

0x07

TFISU Pacing Ticks (Japan TTC only)

0x01–0xFF (default=0x0C (24 ms))

0x08

TLSSU Pacing Ticks (Japan TTC only)

0x01–0xFF
(default=0x0C (24 ms))

0x0A-0x0B

Congestion Level 1 Onset Threshold

3200 octets (default)
Default value represents 400 ms of queued MSUs at 64 kbps (457 ms@56kbps)

Value must be less than or equal to the level 2 onset threshold.

Value must be greater than the level 1 abate threshold.

0x0C-0x0D

Congestion Level 2 Onset Threshold

4150 octets (default)
Default value represents 519 ms of queued MSUs at 64 kbps (593 ms @ 56 kbps)

This value must be less than or equal to the level 3 onset threshold.

This value must be greater than the level 2 abate threshold.

0x0E-0x0F

Congestion Level 3 Onset Threshold

5100 octets (default)
Default value represents 638 ms of queued MSUs at 64 kbps (729 ms @ kbps)

This value must be less than or equal to the level 4 onset threshold.

This value must be greater than the level 3 abate threshold.

0x10-0x11

Congestion Level 4 Onset Threshold

8000 octets (default)
Default value represents 1000 ms of queued MSUs at 64 kbps (1143 ms @ 56 kbps)

This value must be greater than the level 4 abate threshold.

0x12-0x13

Congestion Level 1 Abate Threshold

1900 octets (default)
Default value represents 238 ms of queued MSUs at 64 kbps (271 ms @ 56 kbps)

This value must be less than the level 1 onset threshold.

0x14-0x15

Congestion Level 2 Abate Threshold

3500 octets (default)
Default value represents 438 ms of queued MSUs at 64 kbps (500 ms @ 56 kbps)

This value must be greater or equal to the level 1 abate threshold.

This value must be less than the level 2 onset threshold.

0x16-0x17

Congestion Level 3 Abate Threshold

4500 octets (default)
Default value represents 563 ms of queued MSUs at 64 kbps (643 ms @ 56 kbps)

This value must be greater than or equal to the level 2 abate threshold.

This value must be less than the level 3 onset threshold.

0x18-0x19

Congestion Level 4 Abate Threshold

5500 octets (default)
Default value represents 688 ms of queued MSU at 64 kbps (786 ms @ 56 kbps)

This value must be greater than or equal to the level 3 abate threshold.

This value must be less than the level 4 onset threshold.