Variable-length Global Title Translation Feature

A translation type or GTT set can contain global title addresses of varying length. If the Variable-length Global Title Translation (VGTT) feature is turned on with the chg-feat command, a translation type or GTT set contain up to 10 different length global title addresses. If the Support for 16 GTT Lengths in VGTT feature is enabled and turned on with the enable-ctrl-feat and chg-ctrl-feat commands, a translation type or GTT set can contain up to 16 different length global title addresses. The Support for 16 GTT Lengths in VGTT feature cannot be enabled and turned on unless the VGTT feature is turned on.

The length of the global title address is only limited by the range of values for the gta and egta parameters of either the ent-gtt and chg-gtt commands, if only the GTT feature is turned on, or the ent-gta and chg-gta commands, if the EGTT feature is turned on, and by the global title addresses already assigned to the translation type or GTT set. The length of a global title address is from 1 to 21 digits, or 1 to 21 hexadecimal digits if the Hex Digit Support for GTT feature is enabled. The ndgt parameter of the ent-tt or ent-gttset command has no effect on the length of the global title address and cannot be used. If the ndgt parameter is specified with the ent-tt or ent-gttset command and the VGTT feature is on or the Support for 16 GTT Lengths in VGTT feature is enabled and turned on, the ent-tt or ent-gttset command is rejected with this message.

E4011 Cmd Rej: NDGT parameter is invalid for VGTT

As global title addresses of different lengths are assigned to a specific translation type, these lengths are displayed in the NDGT field of the rtrv-tt command output, as shown in the following example.

rlghncxa03w 09-05-25 09:57:31 GMT  EAGLE5 41.0.0
TYPEA      TTN        NDGT
1          lidb       6, 12, 15
2          c800       10
3          d700       6

ALIAS      TYPEA
50         3
65         3

TYPEI      TTN        NDGT
105        itudb      8

ALIAS      TYPEI
7          105

TYPEN      TTN        NDGT
120        dbitu      7

ALIAS      TYPEN
8          120

If the global title addresses are assigned to a GTT set, these lengths are displayed in the NDGT field of the rtrv-gttset command output, as shown in the following example.

rlghncxa03w 09-07-07 00:30:31 GMT EAGLE5 41.1.0
GTTSN     NETDOM  NDGT
lidb      ansi    3, 7, 10
t800      ansi    6
si000     itu     15
imsi      itu     15
abcd1234  itu     12

GTT-SET table is (5 of 2000) 1% full.

In the rtrv-tt output example, the ANSI translation type 1 contains three different length global title addresses; global title addresses containing 6 digits, 12 digits, and 15 digits.

In the rtrv-gttset example, the GTT set lidb contains three different length global title addresses; global title addresses containing 3 digits, 7 digits, and 10 digits.

When the VGTT feature is on, and the last global title address of a particular length is deleted for the specified translation type or GTT set, then that length is no longer supported. That length is not displayed in the NDGT field of the rtrv-tt or the rtrv-gttset output. For example, if the last 6-digit global title address is deleted from ANSI translation type 1 (from the previous example), the NDGT field of the rtrv-tt command shows only the numbers 12 and 15 in the NDGT field indicating that ANSI translation type 1 contains only 12- and 15-digit global title addresses. If the last 7-digit global title address is deleted from GTT set lidb (from the previous example), the NDGT field of the rtrv-gttset command shows only the numbers three and 10 in the NDGT field indicating that GTT set lidb contains only 3- and 10-digit global title addresses.

If the translation type has the maximum number of different length global title addresses assigned to it, and another global title address is specified for the translation type, the length of the global title address being added to the translation type must be the same as one of the lengths already assigned to the translation type. If the length of the global title address is not one of the lengths shown in the rtrv-tt output, the ent-gtt command is rejected with this message.

E4007 Cmd Rej: Exceeding max GTA Lengths supported per TT

If the GTT set has the maximum number of different length global title addresses assigned to it, and another global title address is specified for the GTT set, the length of the global title address being added to the GTT set must be the same as one of the lengths already assigned to the GTT set. If the length of the global title address is not one of the lengths shown in the rtrv-gttset output, the ent-gta command is rejected with this message.

E4008 Cmd Rej: Exceeding max GTA Lengths supported per GTTSET

If the translation type or GTT set has less than the maximum number of different length global title addresses assigned to it, and another global title address is specified for the translation type or GTT set, the length of the global title address can be from one to 21 digits and does not have to match the length of the other global title addresses assigned to the translation type or the GTT set.

If the VGTT feature is off, shown the entry VGTT = off in the rtrv-feat output, the global title address length must be equal to the number of digits specified by the given translation type or GTT set. The length of the global title address can be verified with the rtrv-tt or rtrv-gttset command.

The VGTT and the Support for 16 GTT Lengths in VGTT features require that a service module is installed in the EAGLE. Adding a Service Module shows the type of service modules that can be used depending on which features are on or enabled.