Verilink NCC 2020 (880-503284-001) Product Manual - Manual (Page 27)

Configuration
Verilink NCC 2020 User Manual 3-5
Table 3-4 CSU Configuration Options
Menu Option Description Instructions
W) framing 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).
F) format 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.
Larger buffers are
more resistant to a
jittery signal; smaller
buffers introduce
less delay.
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.
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.