
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
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
6.3.2 SWITCHES
S1 - Reset
Normally open, press to reset. Momentary switch used to reset the module.
6.4 ALIGNMENT SPECIFICATIONSThe 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.
TableJumpers |
| 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 |
27256 | |||
(normal) | |||
27128 | |||
| |||
| 2764 | ||
| |||
J26 - Not used, jumper is placed on
DCB/CSB Data Bus Select | Data Bus | |
J33 | pin 1 to pin 2 | Switch CSB (nor- |
|
| mal) |
| pin 2 to pin 3 | ACS |