Technical Product Manual - DCT1900

Installation Instructions, Central Processing Unit (CPU) – REX-BRD0004 or 2/ROFNB 157 19/2

Connectors

The CPU has the following front connectors (see Figure 5–4):

zSync in

zSync out (3x)

zPrinter port

zPC port

zGA port

The Sync In and Sync Out ports on the CPU are connected via two methods.

Method 1: Refer to Chapter 18, Synchronization Distribution Board and Chapter 20, Modular Cabinet CPU Cabling. This method is the older method which incorporates an internally mounted, inside the modular cabinet, Synch Distribution board and cables.

Method 2: Refer to Chapter 20, Modular Cabinet CPU Cabling, a newer method of connecting sync cables directly between master and slave CPUs without using internally mounted sync board and cables.

Note: The Sync Distribution Boad (SDB) and cables mentioned in method 1 are no longer availabe or included in new systems. Method 2 must be used for any new installations or if the SDB and cables must be replaced on an existing installation.

The SMS/printer, PC and general alarm ports are connected to the MCCB via factory installed cables.

Interface characteristics of the printer and PC ports are:

zasynchronous, 2400-115200 bit/s

z8 data bits, 1 stop bit, no parity

zX–on/X–off

LEDs

The following LEDs are located on the front of the CPU board:

LED1

Green

: Normally on. Power On LED

LED2

Red

: Normally off. Watch–dog LED

LED3

Red

: Normally lit very weak. Communication with backplane LED

 

 

(not significant)

LED4

Red

: Normally off. Board Error LED

LED5

Red

: Normally off. Info, error or service message received, but not

 

 

read yet

LED6

Green

: Test and Maintenance active. On during actual testing, or

 

 

during RS232 activity on the PC port.

Reset Button

The CPU is provided with a reset button. If this button is pressed, the CPU and the rest of the RE are reset and perform a cold start as if the RE was switched off and on again.

Note:

Resetting the CPU may cause the synchronization slave CPUs, connected to this CPU, to lose their synchronization. Immediate synchronization can be enforced by resetting the slave CPUs after the synchronization master CPU has been reset. Bear in mind that a synchronization slave CPU can be a clock provider to other slave CPUs.

5-4

Install-DCT1900/R8/mw

 

© 2000-2005

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Nortel Networks DCT1900 manual Connectors, LEDs, Reset Button