CSU Configuration Options
Selects T1 framing
mode for both DSX-1 equipment port and T1 network port.
Selection for the Equipment side must match the configuration of the DSX-1 equipment.
Selection for the T1 network side must match the type of T1 installed by the network service provider.
First value = DSX-1 equipment, second value = T1 circuit. 1(SF,SF) — D4 equipment and a D4 T1. 2(ESF,SF) — ESF equipment and a D4 T1. 3(SF,ESF) — D4 equipment and an ESF T1. 4(ESF,ESF) — ESF equipment and an ESF T1.
5(UF,UF) — unframed equipment on an unframed T1 (never use this option on a T1 circuit provided by a telephone company).
6(SF,ZBT) — D4 equipment on a Zero Bit Time Slot Insertion T1 (there are no ZBTSI T1 circuits, do not use this option).
7(ESF,ZBT) — ESF equipment on a ZBTSI T1 (there are no ZBTSI T1 circuits, do not use this option).
Selects AMI or B8ZS for the DSX-1 equipment and T1 network line codes, must match T1 and equipment settings.
In Mux mode (where no DSX-1 equipment is used), only the second parameter is meaningful.
First value = DSX-1 equipment, second value = T1 circuit. 1(AMI,AMI) — AMI coded DSX-1 equipment on an AMI T1. 2(AMI,B8ZS) — AMI DSX-1 equipment on a B8ZS T1.
3(B8ZS,AMI) — B8ZS DSX-1 equipment on an AMI T1 (this selection is problematic unless the equipment is configured to use only 56K of each DS0 instead of 64K per DS0).
4(B8ZS,B8ZS) — B8ZS DSX-1 equipment on a B8ZS T1.
J) jitt buf
Jitter Buffer selects the size of the jitter buffer, in bits, on the DSX-1 and Network sides of the CSU.
1(16,16) — Sets both buffers to 16 bit depth, less resilience to jitter and less delay.
2(40,16) — Sets DSX-1 side to 40 bits and network side to 16 bits.
Larger buffers are more resistant to a jittery signal; smaller buffers introduce less delay.
3(16,40) — Sets the DSX-1 side to 16 bits and the network side to 40 bits.
4(40,40) — Sets the default value of 40-bit jitter buffer on both sides of the CSU.
R) eq crc
Selects whether or not the CSU will regenerate the CRC-6 error checking used in ESF framing on both, one, or no sides.
1(PASS) — same type framing on both sides. 2(NET TO EQ) — ESF equipment on a non-ESF T1. 3(EQ TO NET) — non-ESF equipment on an ESF T1.
4(BOTH) — use in Drop and Insert mode if equipment and T1 are both ESF.
Y) xcode yel
Selects whether yellow alarms will be translated from the D4 bit 2 method to the ESF FDL method.
1(OFF) — use for same type framing on both sides or to have the CSU drop yellow alarms with dissimilar framing.
2(NET TO EQ) — ESF equipment and D4 T1. 3(EQ TO NET) — D4 equipment on an ESF T1. 4(BOTH) — not used.
Verilink NCC 2020 User Manual