ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
Strata DK I&M 6/00
16-21
ISDN
Inte
rface
s
Figure 16-12 TBSU Switch Layout
Note
It is normal for sockets IC7 and IC8 to be empty.
Table 16-12 TBSU Option Switches, Jumpers, and Connectors
TBSU
Circuit
Option
Switch
Type
Circuit Type
Description
TE
NT
All
SW 1
Push-button
N/A
N/A
Resets firmware on all TBSU circuits. Drops calls off the
TBSU.
1
SW 100
Jumper
X
X
Causes the circuit
1
to operate as TE or NT.
1. Also requires Program *60 to set TE or NT.
1
SW 101
Slide
On
On
Switches a 100-ohm resistor in/out of the circuit.
2
SW 200
Jumper
X
X
Causes the circuit
2
to operate as TE or NT
1
.
2. SW2 is for factory use only
2
SW 201
Slide
On
On
Switches a 100-ohm resistor in/out of the circuit.
Switch
Type
Circuit
Description
Short
Cut (remove)
W2
Jumper
TBSU1A uses the internal
CPU ROM (IC20)
TBSU1A uses the external
ROM (IC6 and 7)
Future Use
SW2
Jumper
For factory loop back test.
Normal operation
Used for factory
inspection only. Do
not cut this jumper.
TBSU1A
3795
SW201
SW1
SW200
ON
OFF
ON
OFF
Cct2
Cct1
Cct2
Cct1
TB1 TB2
FS
LOS
TS
BSY
CD9
CD10
CD11
CD12
PFT contacts
Monitor
J1
SW101
100
SW100
NT TE
J3
SW2
Loop
Back
W2
IC7
IC6
CUT
ROM
CPU
SHORT
J2
Reset
NT TE
100
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