Paradyne Hotwire 7975 - Manual (Page 84)

Configuration Option Tables
A-4 7975-A2-GB20-40 December 1998
Synchronous Data Port Options Menu
For Synchronous Data Port Options, refer to Table A-2. To access the
Synchronous Data Port Options screen, follow this menu selection sequence:
Main Menu
→
Configuration
→
Load Configuration From
→
SYNC Ports
Table A-2. Synchronous Data Port Options (1 of 3)
Port Type
Possible Settings: E530A, V.35, RS449, X.21
Default Setting: E530A
Determines the port type for the data port.
E530A – The port is configured as an EIA-530A compatible DCE. An EIA-530
compatible DTE can be connected directly to the DB25 Port connector on the rear panel
of the unit.
V.35 – The port is configured as a V.35 compatible DCE. A V.35 compatible DTE can be
connected using an MS34 to DB25 adaptor cable to connect to the DB25 Port
connector on the rear panel of the unit.
E530A – The port is configured as an RS449 compatible DCE. An RS449 compatible
DTE can be connected using a DB37 to DB25 adaptor cable to connect to the DB25
Port connector on the rear panel of the unit.
X.21 – The port is configured as an X.21 compatible DCE. An X.21 compatible DTE can
be connected using a DB15 to DB25 adaptor cable to connect to the DB25 Port
connector on the rear panel of the unit.
Payload Rate
Possible Settings: 64, 128, 192, 256, 320, 384, 448, 512, 576, 640, 704, 768, 832, 896,
960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728, 1792,
1856, 1920, 1984, 2048
Default Setting: 128
NOTE: Payload rates of 1088 kbps and higher pertain only to the 2 Mbps
termination unit.
Specifies the payload rate of the port. This option is not displayed on the unit when
AutoRate is enabled or the unit is configured as an NTU. The LTU configures the
payload rate for the NTU when AutoRate is disabled.
64 to 2048 – Sets the payload rate in kbps when AutoRate is disabled (unit is
configured as fixed rate).
Transmit Clock Source
Possible Settings: Internal, External
Default Setting: Internal
Specifies whether the transmitted data for the synchronous data port is clocked using
an internal clock provided by the LTU (synchronized to the clock source specified by the
clock source configuration option) or an external clock provided by the DTE connected
to the synchronous data port. If an external clock is used, it must be synchronized to the
same clock source as the LTU.
Internal – Indicates the clock is provided internally by the 7975 Termination Unit on the
TXC interchange circuit DB (CCITT 114).
External – Indicates the clock is provided externally by the DTE on the XTXC
interchange circuit DA (CCITT 113). Use this selection if the clock source is set to the
data port.