Juniper JUNOSE 11.1.X - COMMAND REFERENCE A TO M 4-9-2010 Command Reference Manual page 109

Fallback format for serial interfaces:
systemName (up to 4 bytes) slot (1 byte) adapter (1 byte) port (1 byte)
0 (8 bytes)
For E120 routers and E320 routers, adapter is the number of the bay in
which the I/O adapter (IOA) resides, either 0 (representing the right IOA bay
on the E120 router and the upper IOA bay on the E320 router) or 1
(representing the left IOA bay on the E120 router or the lower IOA bay on
the E320 router). For ERX7xx models, ERX14xx models, and ERX310 routers,
which do not use IOAs, adapter is always shown as 0.
Slot numbers 0 through 16 are shown as ASCII characters in the 1-byte slot
field.
fixed-adapter-new-field Configures the fallback format in a fixed format of up
to 17 characters consisting of all ASCII fields with a 2-byte slot field, 1-byte
adapter field, and 2-byte port field:
Fallback format for ATM interfaces:
systemName (up to 4 bytes) slot (2 bytes) adapter (1 byte) port (2 bytes)
VPI (3 bytes) VCI (5 bytes)
Fallback format for Ethernet interfaces:
systemName (up to 4 bytes) slot (2 bytes) adapter (1 byte) port (2 bytes) VLAN
(8 bytes)
Fallback format for serial interfaces:
systemName (up to 4 bytes) slot (2 bytes) adapter (1 byte) port (2 bytes)
0 (8 bytes)
For E120 routers and E320 routers, adapter is the number of the bay in
which the IOA resides, either 0 or 1. For ERX7xx models, ERX14xx models,
and ERX310 routers, which do not use IOAs, adapter is always shown as 0.
Slot numbers 0 through 16 are shown as integers in the 2-byte slot field.
stacked Includes a 4-byte stacked VLAN (S-VLAN) ID in the fixed,
fixed-adapter-embedded, and fixed-adapter-new-field fallback formats for Ethernet
interfaces; by default, these formats do not include the S-VLAN ID unless you
specify the optional stacked keyword:
Fallback format for Ethernet interfaces that use fixed:
systemName (up to 4 bytes) slot (2 bytes) port (1 byte) S-VLAN (4 bytes) VLAN
(4 bytes)
Fallback format for Ethernet interfaces that use fixed-adapter-embedded:
systemName (up to 4 bytes) slot (1 byte) adapter (1 byte) port (1 byte) S-VLAN
(4 bytes) VLAN (4 bytes)
Fallback format for Ethernet interfaces that use fixed-adapter-new-field:
systemName (up to 4 bytes) slot (2 bytes) adapter (1 byte) port (2 bytes)
S-VLAN (4 bytes) VLAN (4 bytes)
Global Configuration
Mode
Chapter 2: A Commands
aaa tunnel calling-number-format-fallback
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