Verilink C100 (880-502893-001) Product Manual - Manual (Page 70)

Configuring the C100/C150 Using the Console Port
6-8 Verilink C100 and C150 T1/FT1 CSU/DSU 6/15/99
Synchronous channel invert data
This selection determines whether data to and from the Synchronous
Channel is normal or inverted. When Disabled is displayed, data on
the Synchronous Channel passes normally. When Enabled is
displayed, both the transmit and receive data signals at the local
Synchronous Channel are inverted. By inverting the data, this feature
permits certain protocols such as HDLC, SDLC, and so forth, to pass
over the T-1 facility at multiples of 64000 bps and meet ones-density
requirements of the Network. When using this mode, usually both the
local and remote units have this option selected.
Synchronous Channel Invert External Transmit Clock
The External Transmit Clock field determines whether External
Transmit Clock from the Synchronous Channel is normal or inverted.
When Disable is selected, the External Transmit Clock on the
Synchronous Channel passes normally. With Enable selected, External
Transmit Clock from the local Synchronous Channel is the inverted
Synchronous Channel signal.
This feature is used when the round trip delay of the Transmit Clock
exceeds one half bit time (due to cable length and higher frequencies).
This feature should be tried if sporadic errors are noticed on the
Synchronous Channel.
Internal or external transmit clock
This field determines whether Internal Clock or External Transmit
Clock is used. With Internal selected, Internal Transmit Clock from the
T-1 CSU/DSU is provided to the Synchronous Channel. With External
selected, External Transmit Clock from the terminal equipment to the
Synchronous Channel. When using this mode, External Transmit
Clock coming from the terminal equipment must be frequency-locked
to the Receive Clock provided by the T-1 CSU/DSU
Pressing the SPACE bar when on the Transmit Clock field advances the
blinking cursor to the DS01 selection.