Mike's PBX Cookbook

DTI/PRI Maintenance

DTI Startup

LD 60
STAT
ENLL x
STAT x
LCNT x
RCNT x
SSCK x (0&1)
TRCK PCK

PRI Startup

*LD 96
*ENL TMDI x
**STAT MSDL x
**SLFT MSDL x
**ENL MSDL x FDL
**STAT MSDL x

LD 60
STAT
ENLL x
STAT x
LCNT x
RCNT x
SSCK x (0 & 1)
TRCK PCK
SSCK x (0 & 1)

*Use TMDI commands only on the Option 11C TMDI cards.
** Use MSDL commands only when the MSDL card or DDCH daughterboards are used.

Loop-back
Pin-outs

DB15F
Short pin 1 to pin 3
and pin 9 to pin 11

RJ48C, 8 pin modular
Short pin 1 to pin 4
and pin 2 to pin 5

Remote loop-back test

Perform each command in the order listed. Start at system “B”, Step 1 and so on. Move to System ”A” to perform step 4, and so on. This procedure assumes that PRI is used. Do not use LD 96 commands when testing a DTI.

System “A” - Testing
4. LD 96, DIS DCH x
5. LD 60, DISL x
6. RMST x

8. Enable Loop
System “B” – Looping back
1. LD 96, DIS DCH x
2. LD 60, DISL x
3. RLBK X
7. DLBK x
9. Enable Loop

Red and Yellow alarms

Red = local, “Right Here”
Yellow = Distant, “Out Younder”

Alarms from cable faults

Red Alarm:
• Receive pair open
• Receive and transmit pairs open
• Corrupted data on receive pair

Yellow Alarm:
• Transmit pair open

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