Follow these guidelines when configuring the MTP layer for Japan-TTC network operation:
Set the LINK_TYPE attribute for all links, NSAPs, and route entries to JTTC.
The point code length for links and NSAPs defaults to 16 when the LINK_TYPE is set to JTTC. If desired for documentation purposes, the point code length can be explicitly set to 16 (the only supported value for JTTC link type) in the link and NSAP configurations.
Specify the 16-bit point codes in either hexadecimal or x.y.z dotted notation. Specify hexadecimal point codes in the order in which they are transmitted on the link: the U-code in the most significant seven bits, the S-code in the next four bits, and the M-code in the least significant five bits. To specify J-NTT or J-TTC 16-bit point codes in x.y.z notation, set the PC_FORMAT parameter in the MTP 3 general configuration section to the value JNTT.
For example:
PC_FORMAT JNTT
...
LINK T1
LINK_TYPE JTTC
ADJACENT_DPC 1.1.2
...
is equivalent to:
...
LINK T1
LINK_TYPE JTTC
ADJACENT_DPC 0x421
...
Set the following general parameters:
RESTART_REQUIRED to FALSE.
DISABLE_UPU to TRUE.
Set the following parameters for each link definition:
LSSU_LEN to 1.
IDLE_FREQ to 24.
RT_FREQ to 24.
The following sample MTP 3 configuration file configures two T1/E1 links with the JTTC protocol variant. The required settings are shown in bold type.
#-----------------------------------------------------
# Sample MTP3 configuration for J-TTC protocol variant
#-----------------------------------------------------
#Overall MTP3 Parameters
#-----------------------
#
NODE_TYPE SP # choose STP [routing] or SP [non-routing]
PC_FORMAT JNTT # Note this is not JTTC
POINT_CODE 1.1.1
RESTART_REQUIRED FALSE
DISABLE_UPU TRUE
MAX_LINKS 4
MAX_USERS 2 # isup + 1 extra
MAX_ROUTES 64
MAX_ROUTE_ENTRIES 1024
MAX_LINK_SETS 2
MAX_ROUTE_MASKS 1
ROUTE_MASK 0xFFFFFFFF
END
#
#Link Parameters
#---------------
#
# Link 0
#
LINK T1 # TDM port 1
LINK_SET 1
LINK_TYPE JTTC
ADJACENT_DPC 1.1.2
LINK_SLC 0
LSSU_LEN 1
RT_FREQ 24
IDLE_FREQ 24
END
#
# Link 1
#
LINK T2 # TDM port 2
LINK_SET 1
LINK_TYPE JTTC
ADJACENT_DPC 1.1.2
LINK_SLC 1
LSSU_LEN 1
RT_FREQ 24
IDLE_FREQ 24
END
#
#User Parameters (NSAP definition)
#---------------------------------
#
NSAP 0 # isup
LINK_TYPE JTTC
END
#
NSAP 1 # spare
LINK_TYPE JTTC
END
#
#
#Routing Parameters
#------------------
#
# Route UP from network to applications on this node
#
ROUTE 0
LINK_TYPE JTTC
DPC 1.1.1 # this node
DIRECTION UP # default is DOWN
ADJACENT_ROUTE FALSE
END
#
# Route to Adjacent node
#
ROUTE 1
LINK_TYPE JTTC
DPC 1.1.2
END
#
#
# Linkset Parameters
#-------------------
LINK_SET_DESCRIPTOR 1
ADJACENT_DPC 1.1.2
MAX_ACTIVE_LINKS 4
ROUTE_NUMBER 1
END
#