
Chapter 2 Installation and Setup Installation and Operation Manual
2-4 Installation and Setup ASM-40 Ver. 1.0
Table 2-1. ASM-40 Internal Jumpers and Switches
DIP Switch Function Possible Settings Factory
Setting
EX/R and INT
sections,
SW4/1, 2
Select the transmit clock INT – ON, internal clock.
EX/R section is disabled
EX/R – ON, INT – OFF, receive clock
EX/R – OFF, INT – OFF, external clock
INT – ON
EX/R – OFF
Note: When set to external clock, ASM-40 automatically configures itself to the DTE data rate, disabling SW3 (baud
rate).
B8ZS and AMI
sections,
SW4/3, 4
Select the line code B8ZS – OFF, AMI – ON, AMI line code
B8ZS – OFF, AMI – OFF, HDB3 or B8ZS line code,
depending on the selected data rate
B8ZS – OFF
AMI – OFF
Note: When setting data rate to 32, 64, 128, 256, 512, 1024, 1920 or 2048 kbps, the HDB3 line coding is
automatically selected. In this case the B8ZS and AMI section settings are irrelevant.
The B8ZS and AMI sections are in use only if the data rate is set to 192( B8ZS only), 384, 768, 1536 or 1544
kbps.
SWEN section,
SW3/1
Enables activation of the
loopbacks and internal BERT via
the front panel pushbuttons
ON – The diagnostic tests can be activated via
the front panel
OFF – The diagnostic tests cannot be activated
via the front panel
ON
V54E section,
SW3/2
Controls activation of the local
digital loopback when remote
digital loopback is initiated
from the remote unit
ON – Local digital loopback activation is enabled
OFF – Local digital loopback activation is
disabled
ON
CNTE section,
SW3/3
Selects the transmit carrier
mode
ON – Carrier follows the RTS line
OFF – Carrier is constantly ON
OFF
Note: For ASM-40 units with G.703 Codirectional DTE interface, the CNTE section (SW3/3) must be set to OFF.
B/UB section,
SW3/4
Selects the line impedance:
• Balanced: terminal block or
DB-15
• Unbalanced: BNC
ON – 75Ω (for 32, 64, 128, 256, 512, 1024,
1920 and 2048 kbps)
OFF – 120Ω (for 32, 64, 128, 256, 512, 1024,
1920 and 2048 kbps)
According to
the connector
type
Note: 100Ω line impedance is set by selecting one of the following data rates: 192, 384, 768, 1536 and 1544 kbps. In
this case, the settings of the SW3 B/UB section are ignored.
ALBE section,
SW3/5
Enables local analog loopback
activation from the DTE
(via pin 18 for V.24, RS-530,
V.36 or via pin “JJ” for V.35)
ON – The local analog loopback activation from
the DTE is enabled
OFF – The local analog loopback activation from
the DTE is disabled
OFF
Note
:
Set this section to DIS if the DTE interface does not support the local analog loopback activation via the
appropriate pin.
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