MTP configuration reference

Parameter

Default

Valid values

Description

PC_FORMAT

DEFAULT

DFLT

INTL

JNTT

Point code format.

DFLT = Point codes are interpreted and displayed as 24-bit 8.8.8 values.

INTL = Point codes are interpreted and displayed as 14-bit 3.8.3 values.

JNTT = Use for both Japan NTT and TTC networks. Point codes are interpreted and displayed as 16-bit mcode.scode.ucode values with the U-code in the most significant 7 bits, the S-code in the next 4 bits, and the M-code in the least significant 5 bits.

POINT_CODE

None

N/A

Point code of this node, specified in dotted notation (such as 2.45.76) or a hexadecimal number (such as 0x101). This parameter is required.

NODE_TYPE

STP

STP

SP

Mode of operation.

STP = transfer functionality

SP = no transfer functionality

POINT_CODE2

None

N/A

Alternate point code for this node when supporting both ANSI and ITU-T networks from the same board. Specify the ITU-T point code in the POINT_CODE parameter and the ANSI point code here.

MTP3_TIMER_RES

SECONDS

SECONDS

TENTHS

Whether timer values in the configuration file are specified in seconds or tenths of a second.

RESTART_REQUIRED

TRUE

TRUE/YES

FALSE/NO

If TRUE, full restart procedure is required whenever node becomes accessible.

VALIDATE_SSF

TRUE

TRUE/YES

FALSE/NO

If TRUE, MTP 3 validates incoming MTP 3 signaling network management (SNM) and test (SLTM/SLTA) messages. Messages with an SSF that does not match the value configured for the link on which the message was received are rejected.

If FALSE, the SSF is not checked on incoming MTP 3 management or test messages (any SSF value is accepted). MTP 3 does not validate the SSF in any incoming or outgoing user part messages.

DISABLE_UPU

FALSE

TRUE/YES

FALSE/NO

If TRUE, MTP never sends a User Part Unavailable message.

MAX_LINKS

4

1 through 128

Maximum number of physical links (actual maximum depends on TX board model and hardware configuration).

MAX_USERS

2

1 through 64

Maximum number of MTP 3 users (user parts).

MAX_ROUTES

32

1 through 32767

Maximum number of routes.

MAX_ROUTE_ENTRIES

1024

1 through 32767

Maximum number of route instances. Logical maximum is MAX_ROUTES * number of SLS values (16 - ITU, 32 - ANSI), but this number can be decreased.

MAX_LINK_SETS

1

1 through 16

Maximum number of supported linksets.

MAX_ROUTE_MASKS

0

0 through 8

Maximum number of routing masks. If zero, all destination point codes in outgoing messages must exactly match a point code in a route entry.

ROUTE_MASK

None

0x00 through
0xFFFFFFFF

Routing mask to be applied to destination point code before matching against routing table entries. Use to reduce the number of routes that must be configured or use if remote destination point codes are not known at configuration time (a database server).

You can specify multiple ROUTE_MASKs. They are applied in the order in which they appear in the configuration file.

TIMER_T15

30

0 through 65535

Time to wait to start or repeat route set congestion test.

TIMER_T16

20

0 through 65535

Time to wait for route set congestion status update.

TIMER_T18_ITU

300

1 through 65535

ITU restart timer for an STP during which links are restarted and TFA, TFR, and TFP messages are received.

TIMER_T20_ITU

600

1 through 65535

ITU overall restart timer.

TIMER_T22_ANSI

300

1 through 65535

ANSI restart timer at restarting SP waiting for links to become available.

TIMER_T23_ANSI

300

1 through 65535

ANSI restart timer at restarting SP waiting for TRA messages.

TIMER_T26_ANSI

130

1 through 65535

ANSI restart timer at restarting SP waiting to repeat TRW message.

TIMER_T27_ANSI

30

1 through 65535

Minimum duration of unavailability for full restart.

TIMER_TRTEINST

18000

0 through 65535

Internal route instance timer (how long a route instance is valid). Not ANSI T30.

MTP3_TRACE_DATA

FALSE

TRUE

FALSE

If TRUE, start tracing of all data between MTP 2 and MTP 3.

OPC_ROUTING

FALSE

TRUE

FALSE

If TRUE, outbound routing takes into account OPC values, as well as DPC and SLS values. If FALSE, outbound routing takes into account only DPC and SLS values. Refer to Configuring multiple OPC emulation for more information.

TRANSPARENT_MODE

FALSE

TRUE

FALSE

If TRUE, all inbound traffic is passed up to the SIO matching bound application regardless of DPC or OPC values. All outbound traffic is shared across all links regardless of DPC or OPC values. If FALSE, normal routing is in effect.

END

N/A

N/A

Marks the end of the general parameters section. This parameter is required.

Parameter

Default

Valid values

Description

PORT

None

T1 through 128 (TDM)

R (remote)

Tn for T1, E1, H.100, and H.110 (actual maximum depends on TX board model and hardware configuration).

R for remote links (links on the other board in a redundant system).

LINK

None

0 through 127

Zero-based link number. Use this number to refer to the link in MTPMGR commands.

LINK_TYPE

ANSI

ANSI

ITU

JNTT

JTTC

MTP 3 protocol variant used on link.

ADJACENT_DPC

None

N/A

Point code of the node on the other end of the link. Use dotted notation (such as 2.45.76) or a hexadecimal number (such as 0x101).

OPC

None

N/A

Originating point code. Use for multiple OPC emulation and OPC routing. Refer to Configuring multiple OPC emulation for more information.

LINK_SET

1

1 through 16

Linkset to which this link belongs.

SSF

NATIONAL (ANSI)

INTERNATIONAL (ITU-T)

NATIONAL

INTERNATIONAL

Value used in the subservice field (SSF) of the SIO.

SUB_SERVICE

2

0 through 3

Overrides SSF parameter. Use either SUB_SERVICE or the SSF parameter.

LINK_PRIORITY

0

0 through 3

Priority of this link within the link set.

MESSAGE_SIZE

272

64 through 1024

Maximum message length for this link.

DISABLED

FALSE

TRUE

FALSE

If TRUE, link is initially disabled. No attempt is made to align with the remote side without manual intervention.

If FALSE, link is initially enabled. It tries to align with the remote side immediately.

USE_PRIORITY

TRUE

TRUE

FALSE

If TRUE, message priorities generated by user parts are inserted into the SIO octet (spare bits) of outgoing messages.

If FALSE, the SIO spare bits are set to zero. Usually set to TRUE in ANSI networks and FALSE in ITU-T networks.

MGNT_MSG_PRIORITY

3

0 through 3

Priority to use for MTP3 management messages.

DPC_LENGTH

24 (ANSI)

14 (ITU)

16 (JNTT/JTTC)

14

16

24

Number of bits in a point code.

MAX_SLTM_RETRY

2

0 through 255

Maximum times to retry signaling link test messages (SLTM) before disabling the link. A value of zero results in infinite retries.

HS_LINK

FALSE

TRUE

FALSE

Setting this parameter to TRUE, notifies MTP that high speed links are in effect and automatically sets HS_EXT_SEQ to TRUE.

Set HS_EXT_SEQ to FALSE for high speed links with normal sequence numbers.

Note: Layers 2 and 3 use this parameter.

HS_EXT_SEQ

FALSE

TRUE

FALSE

Setting this parameter to TRUE, notifies MTP that extended sequence numbers are in effect and changes the size of:

• FSN, BSN, and LI fields in MTP 2 packets

• The last FSN field of COO and COA messages at layer 3

Sequence numbers increase from 7 to 12 bits and the length indicator increases from 6 to 8 bits.

Setting HS_EXT_SEQ to TRUE automatically sets HS_LINK to TRUE. Normal speed links with extended sequence numbers are not supported.

Note: Layers 2 and 3 use this parameter.

P0QUE_LENGTH

16

2 through 1024

Transmit queue length threshold at which the congestion priority is raised to level 0.

P1QUE_LENGTH

32

(p0Qlen + 2) through 1024

Transmit queue length threshold at which the congestion priority is raised to level 1.

P2QUE_LENGTH

64

(p1Qlen + 2) through 1024

Transmit queue length threshold at which the congestion priority is raised to level 2.

P3QUE_LENGTH

128

(p2Qlen + 2) through 1024

Transmit queue length threshold at which the congestion priority is raised to level 3.

DISCARD_PRIORITY

0

0 through 3

Congestion priority at which messages with priority below the current threshold are discarded rather than being queued and risking further congestion escalation.

LINK_SLC

0

0 through 15

Link selection code for signaling link testing.

LINK_TEST_PATTERN

TST

1 through 15 ASCII characters

Link test pattern for SLTM messages.

TIMER_T1

10

0 through 65535

Time delay to avoid an out-of-sequence condition on changeover.

TIMER_T2

10

0 through 65535

Time to wait for changeover acknowledgment.

TIMER_T3

10

0 through 65535

Time delay to avoid an out-of-sequence condition on changeback.

TIMER_T4

10

0 through 65535

Time to wait for first changeback acknowledgment (first attempt).

TIMER_T5

10

0 through 65535

Time to wait for first changeback acknowledgment (second attempt).

TIMER_T6

10

0 through 65535

Time delay to avoid an out-of-sequence condition on controlled rerouting.

TIMER_T7

20

0 through 65535

Time to wait for data link connection acknowledgment.

TIMER_T11

600

0 through 65535

Transfer restricted timer.

TIMER_T12

12

0 through 65535

Time to wait for uninhibit acknowledgment.

TIMER_T13

10

0 through 65535

Time to wait for forced uninhibit.

TIMER_T14

30

0 through 65535

Time to wait for inhibit acknowledgment.

TIMER_T17

10

0 through 65535

Time delay to avoid oscillation of initial alignment failure and link restart.

TIMER_T22

1100

0 through 65535

Time to wait to repeat local inhibit test (ANSI T20 value).

TIMER_T23

1100

0 through 65535

Time to wait to repeat remote inhibit test (ANSI T21 value).

TIMER_T24

40

0 through 65535

Reserved for future use (not ANSI T24).

TIMER_T31

50

0 through 65535

Internal BSN requested timer (not ANSI T31).

TIMER_T32

100

0 through 65535

Time to wait for response to SLTM timer (ANSI T1.111.7 timer T1, not ANSI T32).

TIMER_T33

200

0 through 65535

Signaling link connection timer (not ANSI T33).

TIMER_T34

600

0 through 65535

Periodic signaling link test timer (ANSI T1.111.7 timer T2, not ANSI T34).

TIMER_T40

30

1 through 65535

Time to wait for a bind confirmation from MTP 2 before sending another bind request.

TIMER_T41

30

1 through 65535

Time to wait for a disconnect confirmation from MTP 2 before sending another disconnect request.

TIMER_T42

30

1 through 65535

Time to wait for a flow control confirmation from MTP 2 before sending another flow control request.

TIMER_T43

30

1 through 65535

Time to wait for a status confirmation from MTP 2 before sending another status request.

TIMER_T44

30

1 through 65535

Time to wait for an unbind confirmation from MTP 2 before sending another unbind request.

LINK_TRACE_DATA

FALSE

TRUE

FALSE

If TRUE, starts tracing of all data between MTP 2 and MTP 3 on this link.

END

N/A

N/A

Marks the end of this link definition. This parameter is required.

Parameter

Default

Valid values

Description

ERR_TYPE

NORMAL

NORMAL

PCR

Error correction method.

NORMAL = normal

PCR = preventive cyclic retransmission

HS_LINK

False

TRUE

FALSE

Setting this parameter to TRUE, notifies MTP that high speed links are in effect and automatically sets HS_EXT_SEQ to TRUE.

Set HS_EXT_SEQ to FALSE for high speed links with normal sequence numbers.

Note: Layers 2 and 3 use this parameter.

HS-EXT_SEQ

False

TRUE

FALSE

Setting this parameter to TRUE, notifies MTP that extended sequence numbers are in effect and changes the size of:

• FSN, BSN, and LI fields in MTP 2 packets

• The last FSN field of COO and COA messages at layer 3

Sequence numbers increase from 7 to 12 bits and the length indicator increases from 6 to 8 bits.

Setting HS_EXT_SEQ to TRUE automatically sets HS_LINK to TRUE. Normal speed links with extended sequence numbers are not supported.

Note: Layers 2 and 3 use this parameter.

L2_T1

130 (ANSI)

400 (ITU-T)

1 through 65535

Timer aligned and ready.

L2_T2

115 (ANSI)

100 (ITU-T)

1 through 65535

Timer not aligned.

L2_T3

115 (ANSI)

15 (ITU-T)

1 through 65535

Timer aligned.

L2_T4_N

23 (ANSI)

82 (ITU-T)

1 through 65535

Normal proving period.

L2_T4_E

6 (ANSI)

5 (ITU-T)

1 through 65535

Emergency proving period.

L2_T5

1

1 through 65535

Timer sending busy indications (SIBs).

L2_T6

60

1 through 65535

Timer remote congestion.

L2_T7

20

1 through 65535

Timer excessive delay of acknowledgement.

L2_T10

30

1 through 65535

Amount of time MTP 2 can be isolated from a remote MTP 3 before sending processor outage (SIPO).

L2_T11

20

1 through 65535

Time to wait for a flow control acknowledgement from MTP 3 before sending another flow control indication.

L2_T12

20

1 through 65535

Time to wait for a status confirmation from MTP 3 before sending another status indication.

L2_T13

20

1 through 65535

Time to wait for a disconnect confirmation from MTP 3 before sending another disconnect indication.

LSSU_LEN

2

1 through 2

LSSU length.

MAX_FRAME

272

64 through 1024

Maximum frame length for MSU.

SUERM_THRESH

64

1 through 255

Signal unit error rate monitor threshold (bad frames).

SUERM_D_RATE

256

1 through 65535

Signal unit error rate monitor decrement rate (frames).

AERM_THRESH_E

1

1 through 255

Alignment error rate monitor threshold (emergency alignment).

AERM_THRESH_N

4

1 through 255

Alignment error rate monitor threshold (normal alignment).

MAX_RTB_MSGS

127

1 through 255

Maximum number of MSUs for retransmission (only when using PCR error correction).

MAX_RTB_OCTETS

34544

1 through 65535

Maximum number of MSU octets for retransmission (only when using PCR error correction).

MAX_PROV_ABORT

5

1 through 255

Maximum number of proving failures.

DATA_ENC

NRZ

NRZ

NRZI

Data encoding.

SHARE_FLAGS

TRUE

TRUE

FALSE

If TRUE, allow a single flag to be shared between frames.

USE_FLAGS

TRUE

TRUE

FALSE

If TRUE, use flags between frames.

If FALSE, idle between frames.

MIN_FLAGS

0

0 through 15

Minimum number of additional flags between frames (in addition to shared flag).

ISO_THRESH

1000

1 through 65535

Number of messages queued to MTP 3 while isolated that cause MTP 2 to begin processor outage (SIPOs).

L2_TXQ_THRESH1

50

1 through 65535

Transmission queue length at which the outbound flow control level is raised to one.

L2_TXQ_THRESH1_A

20

1 through 65535

Transmission queue length at which the outbound flow control level is lowered to zero.

L2_TXQ_THRESH2

200

1 through 65535

Transmission queue length at which the outbound flow control level is raised to two. The subsequent indication causes MTP 3 to cease all transmission to MTP 2 until the flow control level returns to one or zero.

L2_TXQ_THRESH2_A

100

1 through 65535

Transmission queue length at which the outbound flow control level is lowered to one.

L2_SAP_THRESH

500

1 through 65535

Number of messages queued to MTP 3 while inbound flow control is in effect that cause MTP 2 to send busy indications (SIBs).

L2_SAP_THRESH_A

100

1 through 65535

Number of messages queued to MTP 3 while inbound flow control is in effect that cause MTP 2 to stop sending busy indications (SIBs).

IDLE_FREQ

0

1 through 65535

Frequency at which FISUs are sent by the software (in ms). Zero indicates that hardware constantly retransmits duplicate FISUs as is the norm.

Switches that process all FISUs in the software (including duplicate FISUs) can use non-zero frequencies.

RT_FREQ

0

1 through 65535

Frequency at which other retransmitted SUs (LSSUs) are sent by the software (in ms). Zero indicates that hardware constantly retransmits duplicate LSSUs as is the norm.

Switches that process all FISUs in the software (including duplicate FISUs) can use non-zero frequencies.

END

N/A

N/A

Marks the end of this link definition. This parameter is required.

Parameter

Default

Valid values

Description

NSAP

None

0 through MAX_USERS - 1

NSAP number. This parameter is required.

LINK_TYPE

ANSI

ANSI

ITU

JNTT

JTTC

MTP 3 protocol variant used by this MTP 3 user part.

P0QUE_LENGTH

0

2 through 1024

Receive queue length threshold at which the congestion priority is raised to level 0.

P1QUE_LENGTH

512

(p0Qlen + 2) through 1024

Receive queue length threshold at which the congestion priority is raised to level 1.

P2QUE_LENGTH

768

(p1Qlen + 2) through 1024

Receive queue length threshold at which the congestion priority is raised to level 2.

P3QUE_LENGTH

896

(p2Qlen + 2) through 1024

Receive queue length threshold at which the congestion priority is raised to level 3.

DPC_LENGTH

24 (ANSI)

14 (ITU-T)

16 (JNTT/JTTC)

14

16

24

Number of bits in a point code.

END

N/A

N/A

Marks the end of this NSAP definition. This parameter is required.

Parameter

Default

Valid values

Description

ROUTE

None

0 through MAX_ROUTES

Route identifier number. This parameter is required.

DPC

None

N/A

Point code that is the target of the route entry. Use dotted notation (such as 2.45.76) or a hexadecimal number (such as 0x101).

OPC

None

N/A

Originating point code. Use for multiple OPC emulation and OPC routing. Refer to Configuring multiple OPC emulation for more information.

SPTYPE

STP

SP

STP

Destination signaling point type.

LINK_TYPE

ANSI

ANSI

ITU

JNTT

JTTC

MTP 3 protocol variant associated with this route.

SSF

NATIONAL (ANSI)

INTERNATIONAL (ITU-T)

NATIONAL

INTERNATIONAL

Value for the sub-service field (SSF) to be used in route management messages for this route.

SUB_SERVICE

2

0 through 3

Overrides SSF parameter. Use either SUB_SERVICE or the SSF parameter.

DIRECTION

DOWN

UP

DOWN

Route direction. Up routes result in messages being routed to user parts or applications on this node; Down routes are routes to remote signaling points.

ADJACENT_ROUTE

TRUE

TRUE|YES

FALSE|NO

If TRUE, this is a route to an adjacent signaling point (a signaling point that is directly connected to this node).

ADJACENT_CLUSTER

FALSE

TRUE|YES

FALSE|NO

If TRUE, this is a route to any cluster, enabling use of the cluster variant of route management messages (ANSI only).

TIMER_T8

10

0 through 65535

Transfer prohibited inhibition timer.

TIMER_T10

450

0 through 65535

Time to wait to start or repeat periodic route set test.

TIMER_T19_ITU

680

1 through 65535

ITU restart timer to avoid ping-pong of TFP, TFR, or TRA messages.

TIMER_T21_ITU

640

1 through 65535

Overall ITU restart timer at adjacent SP.

TIMER_T25_ANSI

320

1 through 65535

ANSI restart timer at adjacent SP waiting for a TRA message.

TIMER_T28_ANSI

300

1 through 65535

ANSI restart timer at adjacent SP waiting for a TRW message.

TIMER_T29_ANSI

630

1 through 65535

ANSI restart timer started when a TRA is sent in response to an unexpected TRA or TRW.

TIMER_T30_ANSI

320

1 through 65535

ANSI restart timer to limit sending of TFPs and TFRs in response to an unexpected TRA or TRW.

END

N/A

N/A

Marks the end of this route definition. This parameter is required.

Parameter

Default

Valid values

Description

LINK_SET_DESCRIPTOR

None

1 through MAX_LINKSETS

Linkset identifier number; referenced in LINK_SET parameter of each individual link.

ADJACENT_DPC

None

N/A

Point code of the adjacent SP that terminates this linkset. Use dotted notation (such as 2.45.76) or a hexadecimal number (such as 0x101).

OPC

None

N/A

Originating point code. Use for multiple OPC emulation and OPC routing. Refer to Configuring multiple OPC emulation for more information.

MAX_ACTIVE_LINKS

16

1 through 32

Target number of links in this linkset to keep active at any given time.

ROUTE_NUMBER

None (priority for a route
defaults to zero)

0 through MAX_ROUTES

Route number and optional priority associated with a destination that can be reached through this linkset. As many as 256 route numbers can be specified per linkset. The same route number can be assigned to multiple linksets.

The optional priority associated with the route number is relative to other linksets that also contain this route number.

END

N/A

N/A

Marks the end of this linkset definition. This parameter is required.