MX2800 STS-1 User Manual Configuration, Section 3
VT Interface
61204659L1-1A 3-15
VT2 Mode
When the system is provisioned for VT2 (E1) mode, each of the seven VT groups is configured to carry
three VT2s (2.304 Mbps each), for a total of 21 VT2s. Any VT2 may be mapped to any physical E1 port
designated 1-21 that is not already mapped. Physical E1 ports 22-28 are unequipped (not used) when the
product is configured for VT2 mode. The diagram below illustrates how the VT2s are associated with the
physical E1 ports for VT2 mapping both by VT group and sequentially.
Table 3-2 illustrates VT2 (E1) Mode.
Table 3-2. VT2 Mode Cross-Connect Mapping
Physical Port
Sequential-mapping
(TR-253)
Physical Port
Group-mapping
(M13)
VT 1.5 # VTG-VT
1111-1VTG #1
8281-2
15 3 15 1-3
2422-1VTG #2
9592-2
16 6 16 2-3
3733-1VTG #3
10 8 10 3-2
17 9 17 3-3
41044-1VTG #4
11 11 11 4-2
18 12 18 4-3
51355-1VTG #5
12 14 12 5-2
19 15 19 5-3
61666-1VTG #6
13 17 13 6-2
20 18 20 6-3
71977-1VTG #7
14 20 14 7-2
21 21 21 7-3
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