NETWORK INTERFACE MODULE (NetNIM)

6.2.1 LEDS

1. Clock A and B LED

Clock A/B LED is on for clock A and off for clock B.

2. Companion Clock LED

The companion clock LED is on if the companion card indicates a malfunction or if the companion card is not installed. Otherwise, the clock(s) are functioning and the LED is off.

3. Comm to SMM LED

The Comm to SMM LED is on if the NIM is the selected unit to communicate to the SMM. Otherwise, the LED is off.

4. Alarm LED

The Alarm LED is on if there is a NIM failure. This is presently done on power-up if there is a RAM or ROM malfunction.

6.3 SETUP PROCEDURE

6.3.1 JUMPERS

J11 and J12 select the Tx/Rx direction of the SSB lines. J13 and J14 select the Tx/Rx direction of the SMB lines. (See Figure 6-3.)

6.3.2 SWITCHES

S1 - Reset

Normally open, press to reset. Momentary switch used to reset the module.

6.4 ALIGNMENT SPECIFICATIONS

The NetNIM alignment ensures the correct PCM Clock and Sync frequencies and sets the frequency detectors.

1.Measure the frequency of clock "A" at TP31 with a 10 MHz counter.

2.Adjust C62 for 4.096 MHz ±200 Hz at TP31.

3.Measure the frequency of U30, pin 1 for 4 kHz ±0.25 Hz.

4.Measure the frequency of clock "B" at J32 with a 10 MHz counter.

5.Adjust C65 for 4.096 MHz ±200 Hz at TP32.

6.Measure the frequency of U29, pin 1 for 4 kHz ±0.25 Hz.

Table 6-1 NIM JUMPERS

Jumpers

 

Pins

Bus

J11

 

1 to 2

NetCSB Rx

J12

 

1 to 2

NetCSB Tx

J13

 

1 to 2

NetIDB Rx

J14

 

1 to 2

NetIDB Tx

NetCSB

 

Pins

Baud Rate

J15

 

1 to 2

19200

 

 

3 to 4

9600 (normal)

 

 

5 to 6

4800

 

 

7 to 8

2400

 

 

9 to 10

1200

NetIDB

 

Pins

Baud Rate

J16

 

1 to 2

19200

 

 

3 to 4

9600 (normal)

 

 

5 to 6

4800

 

 

7 to 8

2400

 

 

9 to 10

1200

PROM Addressing

 

 

Addressing

J24-pin 1 to J25-pin 1

27256

J24-pin 2 to J25-pin 2

(normal)

J24-pin 1 to J25-pin 1

27128

J24-pin 3 to J25-pin 3

 

J24-pin 1 only

 

2764

J24-pin 3 to J25-pin 3

 

Watch-Dog Timer Operation

J26 - Not used, jumper is placed on J26-pin 1 only for normal operation.

DCB/CSB Data Bus Select

Data Bus

J33

pin 1 to pin 2

Switch CSB (nor-

 

 

mal)

 

pin 2 to pin 3

ACS

6-2