Verilink PRISM 41TDM (34-00275.4) Product Manual - Manual (Page 46)

38 C HAPTER 4: T ERMINAL I NTERFACE
DDS-I
DDS-I is a standard mode compliant with industry DDS-I standards allowing the
unit to be end -to- end compatible and operate with other-vendor, DDS-compliant
DSUs.
DDS-II
DDS-II is a standard mode that can operate with other standard DDS-II equipment.
TXP-I
TXP-I is a proprietary mode for DDS-I lines that require a 41TDM, PRISM
3030/3060, DSU-MP or DSU-DP unit at the other end of the line. This mode
allows async to sync format conversion, rate adaptation, two-port multiplexing, and
an in-band data link.
TXP-II
TXP-II mode is a proprietary mode for DDS-II lines that require a 41TDM,
PRISM 3030/3060, DSU-MP or DSU-DP unit at the other end of the line. This
mode allows async to sync format conversion, rate adaptation, two-port
multiplexing, and an in-band data link.
Rate
If the DDS Mode is set to DDS-I or TXP-I, the rate is automatically set at 56K. If
the DDS Mode is set to DDS-II or TXP-II, the rate is automatically set at 64K.
When the unit is in TXP-I or TXP-II mode, the DTE rate can be at a different
value than the value for this rate.
Timing
This field selects the bit rate clock source. NET uses the received network signal
as the clock source. INT uses the internal oscillator (25 ppm) for the clock source
and is available only in the DDS-I or TXP-I modes.
Circuit Assurance
When Circuit Assurance is set to Off, CTS follows RTS. When RTS changes to the
On state, CTS changes to the On state after the RTS/CTS delay. CTS changes to
the Off state within one bit time when RTS changes to the Off state.
When Circuit Assurance is set to On, CTS follows RTS if DCD is On. When RTS
changes to the On state, CTS changes to the On state after the RTS/CTS delay if
DCD is On. CTS changes to the Off state when RTS changes to the Off state. CTS
is Off if DCD is Off.
Set RTS to Normal on the DTE PORT parameters when Circuit Assurance is On.
The Force DCD option changes to Normal.
Antistreaming Timer
The Antistreaming Timer is controlled by RTS. If RTS remains enabled long
enough for a timeout to occur, the unit drops CTS and stops sending DTE data.
The Antistreaming Timer is reset when RTS changes to the Off state. The choices
are Off, 10, 30, and 60 seconds.