Lucent Technologies FT-2000 OC-48 User Manual

Circuit Pack Descriptions
7-26 Issue 8.0 July 2002
TOHCTL (LAA26) Circuit Pack Description 7
Purpose of Circuit 7
The Overhead Controller - Tributary (TOHCTL) circuit pack provides access to the
OC-3/OC-12 SONET overhead channel. The OC-3/OC-12 overhead channel
contains SONET section data communications channel (DCC) bytes (bytes
D1-D3).
One LAA26 TOHCTL circuit pack is optional for the FT-2000 OC-48
Add/Drop-Rings Terminal. The LAA26 TOHCTL circuit pack is required for
single-ended operations using the OC-3/OC-12 DCC (for example, CIT remote
login to a DDM-2000 Multiplexer). The LAA26 TOHCTL is compatible with
Release 6.0.0-ADR and later software. Release 7.1 supports only 0x1 OC-12
DCC. Release 7.2 and later releases support 0x1 and 1+1 OC-12 DCC.
Faceplate LED 7
The TOHCTL circuit pack has a red FAULT LED on its faceplate
(Figure 7-9). The red FAULT LED is lighted during a reset condition, when a circuit
pack failure is detected, or when the circuit pack loses power. If the circuit pack
loses power, a separate path is provided for power from the System Controller
(SYSCTL) circuit pack to light the FAULT LED on the TOHCTL circuit pack.
The sanity check circuitry detects hardware and software faults. When a fault
occurs, the microprocessor is reset and the FAULT LED on the circuit pack
faceplate is lighted.

Lucent Technologies FT-2000 OC-48 Specifications

General

Brand	Lucent Technologies
Model	FT-2000 OC-48
Category	Network Hardware
Language	English