Sw1-8: Enable/Disable Loop Tests From Dte; Switch Sw2-1 Line Coding: Hdb3 (Default) - Patton electronics 2701/B User Manual

SW1-8: Enable/Disable Loop Tests from DTE

Use Switch SW1-8 to allow Model 2701 to enter loopback tests when the
DTE raises the appropriate loop request pin.
S1-8
Off
On
Position
SW2-1
SW2-2 CRC-4 multiframe
SW2-3 Data Inversion
SW2-4 V.54/CSU select
SW2-5 FPS enabled
SW2-6 V.54 Response
SW2-7
SW2-8

Switch SW2-1 Line Coding: HDB3 (default)

Use Switch SW2-1 to control the Network Line Coding options. Set these
options to be the same as the Line Coding given to you by your Service
Provider. If you are using two Model 2701s together as short range
modems, set both units to HDB3.
Options: HDB3, AMI
HDB3 In this line coding, the transmitter substitutes a deliberate bipo-
lar violation when excessive zeros in the data stream are
detected. The receiver recognizes these special violations and
decodes them as zeros. This method enables the network to
meet minimum pulse density requirements. Unless AMI is
required in your application, HDB3 should be used whenever
possible.
AMI Alternate Mark Inversion defines a pulse as a "mark," a binary
one, as opposed to a zero. In an E1 network connection, signals
are transmitted as a sequence of ones and zeros. Ones are
sent as pulses, and zeros are sent as spaces, i.e., no pulse.
Response to DTE Loopback Request Enabled
Response to DTE Loopback Request Disabled
Function
Line Coding
Not Used
Not Used
SW2-1
Off
On
Setting
Factory Default
Off
Off
Off
Off
Off
On
N/A
N/A
Line Encoding
HDB3
AMI
10
Selected Option
HDB3
Disabled
Data Not Inverted
V.54 RDL loop
Enabled
Disabled
N/A
N/A