2-6
Installation
GDC 048R154-000
Table 2-2
Option Application Notes — Switchbank S14, Network
Characteristics
(Continued on next page)
Option
Selection
Switch
Position
Description
Network
Coding
B8ZS*
S14-1
Off*
Selects Bipolar with 8 Zero Substi-
tution (B8ZS) encoding for the
network side
AMI
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.
Network ESF
Mode
ANSI
T1.403*
S14-2
Off*
Selects compliance with ANSI
network performance messages
(per Bellcore TR-TSY-000194),
available only with ESF framing.
TR 54016
S14-2
On
Selects compliance with network
maintenance messages per PUB
54016, available only with ESF
framing.
Network TX
Timing
Receive*
S14-3
S14-4
Off* or On
Off*
On
The DSU recovers receive T1
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.
DTE
S14-3
S14-4
Off
On
The DSU translates the clock taken
from the Ext Clk signal provided
by the DTE and uses it as the send
timing source for T1 data output to
the network.
Internal
S14-3
S14-4
On
Off
The DSU provides the send timing
source for T1 data output to the
network.
* Factory default selection.
