Hardware manual

Electra Elite Issue 8
System Hardware Manual 5 - 51
4.9.5 Alarm Conditions
A brief description of each alarm condition is given below.
Alarm Indication Signal (AIS) Detection
On red when the system is receiving an Alarm
Indication Signal from an FT1 trunk.
Controlled Slip Event Detection (SLIP)
On red when the timing difference between a
synchronous receiving terminal and the received
signal exceeds the buffering ability of the terminal.
Cyclic Redundancy Check (CRC) Error Event
Detection
On red when a CRC Error occurs.
Excessive Bipolar Violation (BPV) Detection
On red when excessive BPV is detected.
Line Synchronization Alarm (LSA) Detection
On red when an FT1 trunk loses frame
synchronization.
Out-of-Frame (OOF) Condition Detection
On red when two of the four or five framing data bits
received are in error.
Remote Alarm Indication (RAI) Detection
On red when RAl is received.
4.9.6 Connectors
The DTI-U( ) ETU has one connector:
CN1 Connects to the backboard
4.9.7 Connections
Figure 5-29 DTI-U( ) ETU Connector
TELCO
T1
Provider
CSU/DSU
4 Wire
MDF
TA
TB
RA
RB