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Setup Command Menu 77
Model 2160 Series User Manual 5 • Console and Telnet configuration
Mode
There are two types of Line mode:
• STU-C: Central Office (CO) terminal
• STU-R: Customer Premise Equipment (CPE)
Link
Select the line type for your model. Line type means how many wires you want to use on the CopperLink con-
nection. For example, you can select 2-wire, 4-wire or 8-wire line type for the 8-wire model.
Annex Type
Enter the appropriate Annex type. Annex AF describes the transmission and performance requirements for
North America. Annex BG describes performance and transmission requirements for Europe.
TCPAM Type
TCPAM (Trellis Coded Pulse Amplitude Modulation) is the standard used for line coding. Select the TCPAM
type. Auto is the default option for TCPAM.
Maximum Main Rate
Select the line rate for your model. The main rate is the multiple of 64kbps, 128kbps, or 256kbps- depending
on your model type. Use Table 17 to determine the best main rate for your model.
SNR Margin
SNR margin is an index of line connection quality. Generally, you won’t need to change the SNR Margin. You
can view the actual SNR margin in status command menu.You will experience better line connection quality
for larger SNR margin values.
For example, if you set the SNR margin ias 5, the line connection will drop and reconnect when the SNR mar-
gin is lower than 5. On the other hand, the device will reduce the line rate and reconnect for better line con-
nection quality. You may select the SNR margin from the range -10 to 21.
Table 16. Line Type Chart
Line Type
2-wire 4-wire 8-wire
Model
Type
2-wire model
•
4-wire model
• •
8-wire model
• • •
Table 17. Main Rate Table
Model Type Multiple
TCPAM-16
= 3–60
TCPAM-32
= 12–89
TCPAM-128
= 2–239
2160 2-wire model 64 192–3840 768–5696 128–15296
2161 4-wire model 128 384–7680 1536–11392 256–30592
2162 8-wire model 256 768–15360 3072–22784 512–61184