Verilink 1558D (34-00255) Product Manual - Manual (Page 5)

General 1-1 1558D APS CSU/DSU
1. General
The TxPORT 1558D APS CSU/DSU (Automatic Protection
Switch with integral V.35 DSU/CSU) provides the ideal
solution for mission-critical high speed data applications
requiring redundant path T1 access. The 1558D supports
both T1 and FT1 high speed applications and can automati-
cally restore your application when a problem arises on
either the primary or standby T1 facility. See the ‘Operation’
chapter for a typical APS application. Switching from the
failed T1 line (Path A or Path B) to the standby (Path A or
Path B) is based upon user definable switching alarm thresh-
olds (errored seconds, consecutively severely errored sec-
onds, loss of signal, loss of frame). The 1558D APS CSU/
DSU is fully compatible with AT&T 54017 T1 protection
standards, AT&T 54016 ESF performance standards and TR
62411 T1 standards.
Features
The APS CSU/DSU unit is designed so that it can be config-
ured to support a wide variety of user applications and
speeds. The key features and functions are:
• Mission-Critical Automatic Protection Switching from a Fail
or Impaired T1 Facility to a Standby T1 Facility
• AMI or B8ZS Line Coding
• Integral ESF CSUs (TR 54016 compliant)
• 24 Hour Performance History
• Revertive and Non-revertive Operation
• User-Definable Alarm Switching Thresholds
• Proactive Call-on-Alarm Reporting (requires manager)
• V.35 high speed interface (N x 56/64)
• Desk Top or Rack Mount
• Bantam Test Access Jacks
• Complies with AT&T 54017 Automatic Protection Switch-
ing, 1991
• FCC, IC, UL, and CSA Compliant
Specifications
T1 Network Interface
Line Rate: 1.544 Mbps
Framing: ESF
Line Code: AMI or B8ZS
DS1 Interface: +1 to -27 dB ALBO, 100
Ω
(
±
5%)
Connector: RJ-48 modular jack
Overvoltage Primary and Secondary lightning
Protection:fusing for line cross
V.35 CPE (Equipment Interface)
Standards: Complies with CCITT V.35
Data Rates: 56Kb to 1.536 Mbps (n x 56/64)
Clocking: Internal, External, Network
Looping: Local and Remote (per V.54)
Data Invert: Enable/Disable
Connector: Female, 34-pin
Diagnostics
Line Loop: Signal regeneration only (bidirectional)
Payload Loop: Signal regenerated with new frame syn-
chronization, CRC6, and data.
Loop Activation Industry standard formats and De-acti-
vation:(54016, 62411, T1-403)
Performance: Per AT&T TR54016, TR54017
SUPV Port: Local diagnostics and configuration in-
terface (RS-232/RJ-11)
Test Jacks
Network Side Bantam jacks Tx, Rx, and Bridging for
sides A and Side B
Alarms
Contacts: Normally Opened (NO) and Normally
Closed (NC)
Rating: 0.6A @ 125 VAC
2.0A @ 30 VDC
SUPV STATUS
A LOCKED B
A
B
ALM LOS LP
A
SELECT
AUTO
PATH
B
STATUS
PATH
RX BRDG
TX BRDG
N
E
T
A
RX BRDG
TX BRDG
N
E
T
B
TxPORT
Figure 1 -1 1558D Automatic Protection Switch CSU/DSU
1558D
SD RD TEST
STATUS
PATH
NORM
LOOP
LL RL
APS CSU/DSU
PWR