Unit installation

Appendix D Command Language Installation and Operation Manual D-8 Front Panel Parameters FCD-E1
The channel parameters are independently selected for each user data channel.
Table D-4. Data Channel Configuration Parameters
Designation Function Values Configuration Guidelines MULTIPLIER
Selects the basic data rate supported by each timeslot. All user data rates are multiples of the selected rates.
64K – Data channel rate is a multiple of 64 kbps 56K – Data channel rate is a multiple of 56 kbps Default: 64
Select the basic rate that suits the operating mode of the equipment connected to the corresponding data channel, 56 kbps or 64 kbps. For channel 2 of an FCD-E1 with Ethernet interface, this selection applies to the throughput; therefore it is not recommended to select 56 kbps.
SPEED
Indicates user channel data rate (for Ethernet LAN interface: indicates the throughput)
Available data rates are multiples of the basic rate (56 or 64 kbps). The multiples are in the range of 1 to 31, resulting in rates of 56, 112, ..., 1736 kbps or 64, 128, 192, ..., 1984 kbps, respectively. In the unframed mode, you can select 32 (2048 kbps) for channel 1 To disconnect the channel, select NC Default: NC
Select the data rate used by the equipment connected to the corresponding data channel. The speed is a multiple n, of the basic rate. n, in the range of 1 through 31, actually indicates the number of main link timeslots that are needed to carry the data stream connected to the channel. This is true even when multiples of 56 kbps are used, because stuffing is used to ensure the minimum “1” density. A “1” density compatible with transmission over E1 links is obtained by adding one bit, which is always a “1”, after each group of seven bits; this effectively increases the data rate from 56 kbps to 64 kbps.
FIFO SIZE
Selects the size of the user FIFO buffer used in the data channel
AUTO – Automatic size selection in accordance with the jitter that must be tolerated at each data rate. 32, 60, 104, 144 – Buffer size, in bits (corresponds to FIFO lengths of ±16, ±24, ±52 and ±72 bits).
Default: AUTO
In the DCE and DTE1 clock modes, it is not necessary to increase the FIFO size because the buffer size is automatically set by FCD-E1. If the DTE2 mode is used and the jitter expected in a specific application is higher than what can be tolerated when using the automatically selected size, you can manually select a FIFO size greater than the AUTO size.