Toshiba Perfecptione Installation And Maintenance Manual page 39

INSTALLATION INSTRUCTIONS
SECTION 200-255-204
FEBRUARY1992
as follows:
ELEMENT POSITION MORE
Sl
ON *
12 Multi (Robbed bit signaling)
Sl
OFF 24 Multi (Common channel
signaling)
s2
ON Zero Code Suppression (ZCS)
I
s2
I
OFF* Binary Eight Zero Suppression
(B8ZS)
s4
1 Not used 1
NOTE:
Digital Multiplexed Interface BOS.
2)
Determine the proper transmit equalizer set-
ting; either short (0 w 150 feet), medium (150
w 450 feet), or long (450 * 655 feet); then
select the appropriate setting using transmit
equalizer setting switch S2 (8-element DIP
switch) as follows:
I s8
I
Not used
I
3) The NDTU is installed in the TOO slot. A
second NDTU may be installed in the TO8 slot.
Each NDTU provides a maximum of 24 chan-
nels, divided into groups consisting of four
channels each. The first group would fill trunk
slot TOO, the second TO1 with the remaining
four groups occupying trunk slots TO2 m TO5
for a total of six groups. For example, if eight
channels are active on the NDTU then slots
TOO and TO1 are active i.e., no PCB may be
installed in slot TO1 . However, PCBs may be
installed in slots TO2 w T05. Enable the appro-
priate channels using slot enable/disable
switch S3 (6-element DIP switch) as follows:
NOTE:
Set switch element to ON to enable associ-
ated digital trunk channels; OFF to disable
channels.
4)
Signaling modes are individually selectable
for each active channel. Determine the appro-
priate signaling mode for each channel; either
CO (Loop Start) mode, CO (Ground Start)
mode, DID (2-wire loop signaling), or TIE
trunk (Type II 4-wire E&M) mode; then assign
the selected signaling modes using signaling
type selection switches S4 w Sll (6-element
DIP switches) see Loop/Ground Start Mode.
5)
Configure the NDTU for the appropriate ROM
type, either 64 Kbit or 256 Kbit, using
strappings shown below.
the
6)
When configured for normal operation, the
NDTU is in the slave mode, and the central
office serves as the master clock. For CO
testing purposes, the NDTU may be config-
ured as the master. Configure the NDTU for
the appropriate operating mode using the
strapping options shown below.
STRAPS
OPERATING MODE LOOPBACK OPTION
SLAVE 1 MASTER MASTER ( SLAVE
TB3andTB4 l-2'
I
2-3
ITB~ and TB6l 1 1-2 1 2-3' 1
4-17