Table
2-3
Network
Requirements
Facility interface Code
I
Network Jack
(Loop start line)
Ringer Equivalence
(PCOU)
(RCOU RCOS)
PEMU
(Type
I,
Tie line)
Universal Service
Order Code
N/A
N/A
M,
2 wire
TL31
M,
4 wire
(Type or Tie line)
(Off-premises station)
RGLU (Ground or
Loop Start Line)
RJ21
X
with
(ground)
CX
RDTU
(Note 2f)
1 M, 2 wire
TL31 M, 4 wire
2 wire
TL32-Type
4 wire
RDDU (DID
RJ21
X
N/A
N/A
AS.2
0.38
N/A
Notes:
1.
Only PESU circuits
1
and 2, and RDSU circuits
1
-
4
provide off-premises-station (OPS) capability. All circuits
on PSTU, RSTU, provide OPS.
must use OL 13A or equivalent line conditioning for OPS
connection. RSTU and RDSU must use
13A
or
13B if providing -24 volt loop voltage; or, if equipped
with the 4 8
volt
loop
option PCB
or OL 13C may
be
used for
OPS
connection,
2.
When ordering DS-
circuits, six items must be specified:
a.
The number of channels per
circuit, fractional increments are normally 8, 12, or
16
channels, full
service is 24 channels. Unused channels must be bit-stuffed.
b.
The type of
CO line assigned to each channel: Loop Start, Ground Start, tie (Wink or Immediate Start), DID
(Wink or Immediate).
c. Frame Format Type: Super Frame
or Extended Super Frame (ESF). The
provider normally
specifies the Frame Format to be used, either is adequate for
CO digital voice lines. ESF provides
a higher level of performance monitoring, but requires trained personnel and the ESF CSU normally costs
more than an
only CSU.
d. Line Code Type: Alternate Mark Inversion
or Bipolar
8
Zero Substitution
The
provider
normally specifies the Line Code to be used, either is adequate for
CO digital voice lines.
e. The customer must provide the Channel Service Unit
to interface the
circuit to the Telco
circuit.
are a Telco requirement.)
f. RDTU Network Channel Interface Codes:
ISN,
KN,
2-6
January
1996
Содержание Strata AirLink DK280
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