Alarm Conditions; Connectors; Connections; Figure 5-26 Dti-U( ) Etu Connector - NEC ElectraElite 48 System Hardware Manual

Issue 6
5 - 42
4.8.5

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
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.
4.8.6

Connectors

The DTI-U( ) ETU has one connector:
CN1
4.8.7

Connections

TELCO
Provider
when an FT1
Connects to the backboard
T1
CSU/DSU

Figure 5-26 DTI-U( ) ETU Connector

Installing Electronic Telephone Units
Electra Elite
trunk loses frame
MDF
TA
4 Wire TB
RA
RB