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2-6
Table 2-2
Option Application Notes — Switchbank S14, Network
Characteristics
Option
Selection
Network
B8ZS*
Coding
AMI
Network ESF
ANSI
Mode
T1.403*
TR 54016
Network TX
Receive*
Timing
DTE
Internal
* Factory default selection.
GDC 048R154-000
Switch
Position
S14-1
Off*
Selects Bipolar with 8 Zero Substi-
tution (B8ZS) encoding for the
network side
S14-1
On
Selects Alternate Mark Inversion
(AMI) encoding for the network
side.
The DSU enforces an 8 x (N+1)
ones density requirement when
AMI is selected in combination
with framed N x 64k operation and
consecutive DS0s, or with un-
framed operation.
S14-2
Off*
Selects compliance with ANSI
network performance messages
(per Bellcore TR-TSY-000194),
available only with ESF framing.
S14-2
On
Selects compliance with network
maintenance messages per PUB
54016, available only with ESF
framing.
S14-3
Off* or On
The DSU recovers receive T1
S14-4
Off*
On
clock from the network receive T1
data and uses it as the send timing
source for T1 data output to the
network.
Note:
Both settings provide the same
result.
S14-3
Off
The DSU translates the clock taken
S14-4
On
from the Ext Clk signal provided
by the DTE and uses it as the send
timing source for T1 data output to
the network.
S14-3
On
The DSU provides the send timing
S14-4
Off
source for T1 data output to the
network.
(Continued on next page)
Installation
Description
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