CopperOptics 150-1218-02 Посібник - Сторінка 2
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Друкувати сторінкуSection 150-612-100
Revision 02
A. PRODUCT OVERVIEW
1. DESCRIPTION AND FEATURES
1.01
PairGain's HiGain-2 Remote Unit Model
HRU-612, Issue 1, List 1, Figure 1, is the
remote end of a single pair repeaterless T1
transmission system. When used in conjunction
with a HiGain-2 Line Unit HLU-611 the system
provides 1.544 Mb/s transmission on one
unconditioned copper pair over the cable ranges
shown in Table 1. The HiGain-2 system utilizes
2B1Q VHDSL (Very High-bit-rate Digital Subscriber
Line) transmission technology. HiGain-2 complies
with the ANSI T1E1.4, T1.403-1989 and T1E1.4/92-
002R2 technical standards & recommendations.
The HRU-612 List 1 mounts in a single slot of any
industry standard 400 mechanics shelf or in
equivalent enclosures manufactured by PairGain
Technologies. The system also complies with TR-
TSY-000063 (Network Equipment Building System
(NEBS) Generic Equipment requirements) and TR-
TSY-000499 (Transport System Generic
Requirements - TSGR) common requirements.
1.02
Revision History of this practice.
Revision 02 — August 21, 1996
a) Extended temperature ratings from 0° to
+50° C to -40° to +65° C.
b) Extended the PPM offset range from
±64PPM to ±100PPM.
1.03
Features of the HRU-612 Issue 1 List 1
HiGain-2 Remote Unit are as follows:
• ANSI T1.403 DS1 Customer Interface
• VHDSL Line Powered operation - no local
power required
• Front Panel DS1 and VHDSL Status
Display
• Generic & addressable repeater Loopback
activation codes.
• Metallic smart-jack loopback. Conforms to
TR-TSY-000312.
• RS-232 front panel terminal access for
craft
Cable Gauge
Loss @ 392
kHz dB/kft
26/0.4 mm
24/051mm
22/0.61mm
19/0.91mm
Page 2
TABLE 1. HIGAIN-2 VHDSL LOOP LIMITS
Ohms per kft
4.97
83.3
3.87
51.9
3.01
32.4
2.17
16.1
• Provisioning switches for CPE current,
RCV LBO and XMT LOS initiated
loopback or AIS.
• Front panel jacks for test access
• CPE current monitor test points
• Front panel VHDSL margin threshold
indicator.
• Lightning and power cross protection on
VHDSL and DS1 interfaces
• 1568 kb/s full-duplex 2B1Q VHDSL
Transmission on 1 pair
• DS0 blocking.
2. APPLICATIONS
2.01
The primary application of the HiGain-2
System is to provide a quick and cost-
effective way of delivering T1 High Capacity Digital
Service (HCDS) to customers over a metallic cable
pair. The HiGain-2 system can be deployed on 1
unconditioned, non-loaded pair of wires without
repeaters, and without the need for either bridged
tap removal or binder group separation.
2.02
The general guidelines, on which the range
deployment rules in Table 1 are based,
require that the VHDSL HiGain-2 loop (which
operates at twice the line rate of standard HiGain
HDSL products) have less than 35 dB of loss at the
2B1Q line rate of 392 kHz, @ 135 ohm source and
load impedances.
2.03
The HiGain-2 system operates with any
number of other T1, POTS, Digital Data
Service (DDS) or other HiGain-2 Systems sharing the
same cable binder group. HiGain-2 systems can be
used with customers requiring DS1 service on a
temporary or permanent basis. HiGain-2 also provides
a means of quickly deploying service in advance of
fiber-optic transmission systems. Using HiGain-2 T1
service can be connected within a few days or even a
few hours. Fiber optic systems can be installed at a
leisurely pace and cut-over from HiGain-2 when the
time allows. The HiGain-2 system can then be easily
removed and utilized elsewhere.
Maximum Loop For
35 dB Loss
7.0 kft / 2.13 km
9 kft / 2.74 km
12 kft / 3.66 km
16 kft / 4.87 km
Ohms @ Maximum
Loop Length
583
467
389
258