DCP Configuration
4-53
3920-A2-GN31-30
November 1996
Leased Line — Singleport Mode
A
The Leased Line configuration options only appear when the Sync Leased factory preset template
is selected. They are used to configure the modem for operation over leased lines.
Table 4-11 shows each Leased Line configuration option as it appears on the LCD, with the Sync
Leased factory default setting (the default value if the modem is just being installed) shown
following the colon ( : ) on the first line and with all available selections listed on the second line.
Following this is a description of the configuration option. Factory default settings are listed in
Appendix F.
Table 4-11
(1 of 5)
Leased Line Configuration Options— Singleport Mode
A
LeaseModulation: V34
Nxt V34 V32_Family TMp V33 V29 V27b/V22b
Lease Modulation. Modulation reduces the amount of scrolling necessary to select Leased Line rates by limiting the
number of Leased Line Rate configuration options. Only one group of Leased Line rates is displayed depending on the
setting of the Lease Modulation configuration option (V.34, V.32bis, V.32terbo, TMp, V.33, V.29, V.27bis, V.22bis).
LeasedLine Rate: 28800(V34)
Nxt 33600 31200 28800(V34) 26400(V34) 24000(V34) 21600(V34) 19200(V34) 16800(V34) 14400(V34)
12000(V34) 9600(V34) 7200(V34) 4800(V34) 2400(V34) 19200(V32t) 16800(V32t) 14400(V32b)
12000(V32b) 9600(V32b) 7200(V32b) 4800(V32b) 19200(TMp), 14400(TMp) 9600(TMp) 7200(TMp)
4800(TMp) 2400(TMp) 2400(V22bis) 14400(V33) 12000(V33) 9600(V29) 7200(V29) 4800(V29) 4800(V27bis)
2400(V27bis)
Leased-Line Rate. Determines the modem’s data rate and modulation scheme for operation on leased lines.
NOTE: Certain changes to this configuration option will cause the modem to reset.
33600, 31200, 28800(V34), 26400(V34), 24000(V34), 21600(V34), 19200(V34), 16800(V34), 14400(V34) 12000(V34),
9600(V34), 7200(V34), 4800(V34), 2400(V34) – The modem operates using V.34 modulation at the data rate selected.
19200(V32t), 16800(V32t), 14400(V32b), 12000(V32b), 9600(V32b), 7200(V32b), 4800(V32b) – The modem operates
using V.32bis or V.32 terbo modulation at the data rate selected. These modulation schemes are available on 2-wire or
4-wire leased lines.
19200(TMp), 14400(TMp), 9600(TMp), 7200(TMp), 4800(TMp), 2400(TMp) – The modem operates in Trellis Multipoint
mode at the data rate selected. These modulation schemes are available on 4-wire leased lines. The 19200(TMp)
modulation does not appear on tributary modems.
NOTE: TMp control modems can accept mixed inbound rates from tributary modems. For example, one inbound link
may be configured for 14.4 kbps while another link experiencing line impairments may be configured for
9.6 kbps. The following control/tributary rate combinations are allowed: control at 19.2 kbps, tributaries at 14.4
or 9.6 kbps; control at 14.4 kbps, tributaries at 14.4 or 9.6 kbps; control at 9.6 kbps, tributaries at 9.6 or
7.2 kbps; control at 7.2 kbps, tributaries at 7.2 or 4.8 kbps; control at 4.8 kbps, tributaries at 4.8 or 2.4 kbps;
control at 2.4 kbps, tributaries at 2.4 kbps. Tributary rates will never exceed control rates. If tributary and
control rates are equal, reducing the control rate will automatically reduce the tributary rate.
2400(V22bis) – This modulation scheme is available on 2-wire and 4-wire leased lines.
14400(V33), 12000(V33) – These modulation schemes are only available on 4-wire leased lines.
9600(V29), 7200(V29), 4800(V29) – These modulation schemes are only available on 4-wire leased lines.
