May 2001
System Hardware Manual 5 - 127
A6-324000-642-01 – Release 4.0
May 2001
4.2.5 Connectors
CN1 Connects to backboard
CN2 Debug Port
CN3 Log Port
CN4 Expansion Header
CN5 Expansion Header
4.3 COI(8)-U( ) ETU
4.3.1 Description
The COI(8)-U13 (U19 for New Zealand) ETU provides an
interface with the Central Office. The COI ETU contains
circuitry for outside ring detection, holding, dialling and
control functions.
It also incorporates line reversal detection and busy tone
detection circuitry.
LED 8 Red CRC
Cyclic Redundant Check (CRC)
error in frame from network OR
channel busy
LED 9 Red Ch 0 Channel 0 busy indication
LED 10 Red Ch 1 Channel 1 busy indication
LED 11 Red Ch 0 Channel 2 busy indication
Table 5-5 LED Indications (Continued)
LED No. Colour
PCB
Marking
Description
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