121
Interface LEDs
Figure 144 FIC-4T1-F panel
Table 196 LED description
LINK/ACT
• On means the carrier signal has been received.
• Off means no carrier signal has been received.
• Flashing means data is being transmitted or/and received.
LP/AL
• On means the interface is in a loopback.
• Flashing means an AIS, LFA, or RAI alarm signal is present.
• Off means no loopback or alarm is present.
Note:
AIS = Alarm indication signal; LFA = loss of frame alignment; RAI = Remote alarm indication
Interface cables and connection methods
For more information about T1 interface cables, see "T1 interface."
E3/T3 interface module
• FIC-1CE3
• FIC-1CT3
FIC-1CE3
Introduction
The 1-port channelized E3/fractional E3 interface module FIC-1CE3) provides the following features:
• In E3 mode, transmits, receives, and processes one channel of E3 fast traffic; providing E3
traffic access.
• In CE3 mode, provides the subscribers with N × 64 kbps low-speed access, where N is smaller
than or equal to 128.
E3 represents the tertiary group rate
(34.368 Mbps)
of E system in the TDM system. Through E23
and E12 demultiplexing, an E3 channel can be channelized into 16 E1 lines
. Each line supports
both
the E1 and CE1 modes. E23 means either E2
-to-E3 multiplex or E3-to-E2 demultiplex, and E12
-to-E2 multiplex or E2-to-E1 demultiplex. "E23" and "E12" discussed here represent the
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