Avaya Definity SI Maintenance Manual page 1549

EXP-INTF (Expansion Interface Circuit Pack)
The abbreviations have the following meanings:
PROC The TN773 Processor circuit pack (the Active TN773 Processor
circuit pack in a High or Critical Reliability system)
NETCON The SW-CTL portion of the Network Control circuit pack (the
Active Network Control circuit pack in a High or Critical Reliability system)
TDM BUS The Time Division Multiplex Bus that connects circuit packs
within a cabinet
EXP-INTF The Expansion Interface (EXP-INTF) circuit pack
FIBER The optical fiber used to connect Expansion Interface circuit packs
MAINT EPN Maintenance (MAINT) circuit pack
PKT-BUS The Packet Bus used to carry ISDN-BRI signalling information
MGR 1 The local administration terminal
To determine which Expansion Interface Link is active and which is standby for
each Expansion Interface pair, the status system command can be used.
Alternately, visual inspection shows that the Active Expansion Interface circuit
packs have the yellow LED on solid or blink a pattern two seconds on, 200
milliseconds off. The Standby Expansion Interface circuit packs have the yellow
LEDs off.
Fiber Out-of-Frame (a)
In frame, No Neighbor (b)
Expansion Interface Active (c)
Expansion Interface Active (d)
Expansion Interface Standby (e)
Notes:
a. This flashing code corresponds to error codes 769 and 770 from the
Hardware Error Log and indicates a failure of Test #238. These error codes
are usually accompanied by error code 1281 (no Expansion Interface
detected on opposite end of fiber). This condition may be caused by the
absence of the opposite end Expansion Interface circuit pack, a broken or
missing fiber, or a missing lightwave transceiver on either Expansion
Interface circuit pack.
b. This flashing code corresponds to error code 1281 from the Hardware
Error Log and indicates a failure of Test #237. This condition is usually due
to a failed Expansion Interface circuit pack on the opposite end of the fiber.
c. This is the normal state for an EPN Active Expansion Interface circuit pack
that is also the bus master in the EPN.
555-233-123
Condition LED on LED off
0.1 second 0.1 second
0.5 second 0.5 second
2 second 0.2 second
solid on never off
never on solid off
Issue 4 May 2002 10-763