Nortel 1000 Description, Installation And Operation Manual page 250

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553-3001-363 Standard 2.00
Install and configure IP Trunk 3.01 (and later) node
Table 42 maps the unit number to the ISL channel number for a two
ITG-Pentium 24-port trunk cards with an eight channel gap between cards.
Nortel Networks recommends this configuration as it makes it easy to replace
an ITG-Pentium 24-port trunk card with a Media Card 32-port trunk card,
without affecting the other card.
If no gap is left in the numbering sequence between the cards, conversion to
a Media Card 32-port trunk becomes difficult. The ISL channel numbers on
the first card have no room to expand, making it necessary to fully
re-provision the second IP trunk card.
Table 42
Mapping of unit number to ISL Channel number – two cards in system
and expansion gap (Part 1 of 3)
Unit number (from TN)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
September 2004
ISL Channel number
Card 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14