BOTC TEG 6720 Symmetric Om TS3500

BOTC-TEG-6720

Example Transport Engineering Guide (TEG): Symmetricom TS3500 BITS GPS source (Stratum 2 internal, traceable to Stratum 1).

Section Table of Contents Page

DS Data Sheet (weight, footprint, power, heat, timing, alarms/rm, DF blocks, CLEI) 2

1 Overview 3

2 Equipment requirements 3

3 Timing distribution methods 4

4 Historical overview of Stratum 1 source 4-5

5 System connection details 5-7

Issue Revisions Date

1 Original release of Bill Oakes Engineering Guide for Symmetricom TS3500. November 4, 2002

13 Revise into Word format. August 29, 2007

Acronyms: American Wire Gauge (AWG), Building Integrated Timing Supply (BITS), Central Office (CO), Digital

System Cross connect-manual (DSX), Distributing Frame (DF), Enclosed Network Extension-RT/CEV/Hut/Prem

(ENE), Global Positioning System (GPS), Long Range Navigation (LORAN), Network Element (NE), Receive (RX),

Support Engineering Guide (SEG), Transmit (TX).

Bill Oakes Telecom Consultants (BOTC)

[email protected], 831-476-0453

Copyright 2002. All rights reserved.

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BOTC-TEG-6720

Data Sheet:

The preface section of all BOTC-TEGs is a data sheet that provides quick view information for weight, relay rack

footprint, peak (LIST 2)/nominal (LIST 1) power amperage, heat dissipation wattage, timing, alarms/remote

management, DF block and CLEI code requirements. The data shown is an ultimate condition (relay rack fully

loaded with equipment as designed in associated BOTC-TEG). Even though many relay rack deployments are

partially equipped, BOTC recommends basing initial space/engineering planning on ultimate data since existing

rack layouts typically grow to conclusion without follow-up involvement by planning personnel.

Category Requirement

Weight 23 pounds

Timing (BITS) N/A

Alarms None

Remote

management

1 Ethernet or

RS232 TL1

DF blocks N/A

D0MTMT04RA

Symmetricom TS3500

TS3500 is normally mounted in a BITS equipment rack (BOTC-TEG-6760

TH5500 for example) and included in that rack's overall heat total.

Does not apply since TS3500 is the source unit for CO BITS equipment

(BOTC-TEG-6760 TH5500 for example) that distributes timing to NEs.

TS3500 has three (CR, MJ, MN) discrete alarms but connection is not

required since alarms are integrated into TL1 remote management.

No DF connection for TS3500.

TS3500 Ethernet is first choice method. RS232 is alternate second choice.

Peak/LIST 2

amperage at

42.6V

0.75 amps


TH5500 for example) and included in that rack's overall LIST 2 total.

Data sheet for Symmetricom TS3500 BITS GPS source

Footprint

Remarks

13 pounds for TS3500. 10 pounds for ADC MINI-DSX panel equipped with

one module. TS3500 and MINI-DSX are normally mounted in BITS

equipment rack (BOTC-TEG-6760 TH5500 for example) and included in

that rack's overall weight total.

12 inches deep

TS3500 is 12 inches deep with mounting ears adjustable for flush or 5

inch front set out. ADC MINI-DSX is 9 inches deep with flush mounting

ears. TS3500 and MINI-DSX are normally mounted in BITS equipment rack

(BOTC-TEG-6760 TH5500 for example) and included in that rack's footprint

calculation.

CLEI codes (see

BOTC-SEG-0600

section 4)

Nominal/LIST 1

amperage at

52V

0.58 amps


TH5500 for example) and included in that rack's overall LIST 1 total.

Heat

dissipation27 watts

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BOTC-TEG-6720

1. Overview:

Symmetricom TS3500 is a rack mount GPS timing source (internally rated as stratum 2 but traceable to stratum 1

GPS network) that can be used as a reference for CO BITS distribution equipment. TS3500 and the associated ADC

MINI-DSX panel are normally mounted in a BITS equipment rack (for example, see BOTC-TEG-6760 Symmetricom

TH5500 rack layout for TS3500 mounting location). This TEG also supports MINI-DSX panel engineering in a non-

TS3500 CO per section 3 part C.

Prior to engineering each TS3500 job, vendors should consult with Service Provider/Telco personnel about the

antenna type, placement location, building entry method (new or existing entry, conduit, sleeving, resealing of

entry hole, etc) and lightning protection routine. Roof and outside wall antenna choices are shown in section 2. If a

roof antenna is used, lightning suppressor items must be discussed (placement, far end ground for conductor in

section 5 part K). Outside wall antennas normally do not need a lightning suppressor but optional methods are

included (section 2 part C, section 5 part G) to support all potential CO conditions. Since GPS L-band signals are

relatively weak when they finally reach the CO antenna, an Intermediate Frequency (IF) circuit is required to

convert and boost signal strength (allows location flexibility for rack mount TS3500 shelf, see section 5 part H or J,

K coax length). The roof antenna has a built-in IF circuit (no issue). If an outside wall antenna is used, a separate

Intermediate Frequency (IF) unit is required which raises an issue about the inside wall placement location.

2. Equipment requirements:

This section provides part number and mounting/usage details for Symmetricom TS3500 equipment and the

associated ADC MINI-DSX panel. Provide item B or D but not both on the same job.

A) TS3500 shelf kit: Symmetricom part number 990-72050-01 for version with two T1 outputs. Kit includes

090-72000-01 TS3500 shelf, 090-72050-01 TS3500 card, 093-72050-87 hardware kit and a software CD. Shelf is

3.5” high, 19” wide, 12” deep. Shelf mounting ears are reversible for 23” wide racks and adjustable for flush or 5”

front set out. Leave one rack mounting plate space (see BOTC-SEG-0600 section 6) open above shelf for ventilation.

B) TS3500 outside wall antenna kit: Two Symmetricom part number choices depending of the required length

(19’ or 6’) of coax stub that is factory attached to antenna (for connection to optional lightning suppressor or direct

to IF unit if suppressor not used). 990-72050-99 wall antenna kit includes 090-72050-71 IF converter unit with

associated mounting bracket, 112-00013-01 outside wall antenna with 19’ coax stub and 070-00383-02 mounting

bracket for antenna. 990-72050-95 wall antenna kit is same as -99 kit except antenna coax stub is 6’ instead of 19’.

C) Lightning suppressor kit for outside wall antenna: Optional per section 1 consultation items. Symmetricom

part number 093-72050-93. Kit includes 143-00018-02 lightning suppressor, 070-00300-03 suppressor mounting

bracket and 060-00062-01 coax (10’ long). The 093-72050-93 kit (designated by Symmetricom as “outdoor” but

can also be used on an inside wall) has dual SMA connectors which allows suppressor mounting between the IF

unit and antenna per section 5 part G). BOTC does not recommend the 093-72050-94 kit (designated “indoor”)

since it has dual TNC connectors and requires suppressor mounting between IF unit and TS3500 shelf.

D) TS3500 roof antenna kit: Symmetricom part number 990-72050-96. Kit includes 090-72010-97 roof

antenna with internal IF converter, 093-72010-71 antenna hardware, 070-72010-76 mast, 093-00001-01 antenna

cable bracket, 143-00018-01 lightning suppressor, 070-00300-02 suppressor bracket. This TS3500 kit is very

similar in appearance to the TP1100 roof antenna kit (BOTC-TEG-6700) but is not interchangeable with it since the

TP1100 antenna operates on -36VDC (TS3500 antenna operates on -24VDC).

E) MINI-DSX panel: ADC part number MINI-DSX-1/W-1.75X19 provides one MINI-DSX-1-1.75X19 three slot

panel equipped with one MINI-DSX-1/WM-1.75X19 eight position jack module. Two additional jack modules can

be mounted on the panel. 1.75” high, 19” wide, 9” deep. Panel mounting ears are reversible for 23” wide racks and

designed for flush set out only. Required for test access and restoration capability between TS3500 T1 outputs and

BITS distribution equipment inputs (see section 5 part M).

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BOTC-TEG-6720

3. Timing distribution methods:

This section provides an overview of CO timing distribution methods. Part A was originally used (starting in late

1980s) by many Service Providers/Telcos but is no longer the standard in most cases. Part B and C are the current

methods.

A) Network: Bridging Office Repeater (BOR) shelf (ADC TBK-23R-28PNL for example) is added to isolate CO

timing problems from feeding back into the regional timing distribution network. One side of primary and

secondary BOR modules connects to DSX-1 jacks associated with incoming facility that transports timing signals

from an upstream regional stratum 1 rated source. The downstream side of BOR modules is cabled to a BITS

master shelf that distributes timing to CO NEs.

B) Stand alone: TS3500 GPS shelf placed in CO as stand alone stratum 2 with traceability to stratum 1 rated GPS

network (no connection to regional timing distribution network). Outputs are wired to a MINI-DSX panel for

test/restoration access. The MINI-DSX is wired to a BITS master shelf that distributes timing to CO NEs.

Symmetricom TC4500 cesium (BOTC-TEG-6740) and TP1100 GPS/Mini-distribution/Switch Retimer (BOTC-TEG-

6700) can also be used as stand alone units since their timing is internally stratum 1 rated (TC4500) or supported

by stratum 2 Rubidium/stratum 3 Quartz modules (TP1100) that can be traced to the stratum 1 rated GPS network

(see section 4).

C) Sonet rings: TS3500 GPS shelf placed in CO as original stratum 1 traceable source (no connection to regional

timing distribution network). Outputs are wired to a MINI-DSX panel for test/restoration access. The MINI-DSX is

wired to a BITS master shelf that distributes timing directly to CO NEs. Some of the NEs may be designated Sonet

nodes that use this timing for their own operation (typical NE function) and also place the signal on a clear

overhead channel. The overhead channel is common to all Sonet nodes (located in other COs) in the ring. Sonet

nodes in non-TS3500 COs only use the signal to activate their timing output pins (signal not used for their own

operation). The output pins are cabled to a MINI-DSX panel which connects to a BITS master shelf that distributes

timing to NEs in that CO (including a direct run to the timing ring Sonet node for it’s own operation). Symmetricom

TC4500 cesium (BOTC-TEG-6740) and TP1100 GPS/Mini-distribution/Switch Retimer (BOTC-TEG-6700) can also

be used as the original source for this Sonet ring method since their timing is internally stratum 1 rated (TC4500)

or supported by stratum 2 Rubidium/stratum 3 Quartz modules (TP1100) that can be traced to the stratum 1

rated GPS network (see section 4).

4. Historical overview of stratum 1 source (this section is informational only and does not contain any

engineering requirements):

Prior to the introduction of stratum 1 systems with extremely reliable internally generated timing (TC4500 cesium

unit or GPS satellite system as described below), many public/private synchronization networks in the United

States made use of external stratum 1 sources that were based on “Navy time”. To understand why “Navy time”

was used, we need to look back to the early 1700s. Who had the greatest need to know the exact time? It was

always the Naval/Maritime organizations since they had to determine their location without any landmarks to use

as a reference. To navigate on the ocean (without LORAN or GPS as described below), you need three things:

a) a sextant to determine sun/star angles; b) an accurate timing source; c) standard navigation tables that show

the relationship of sextant readings, latitude/longitude and time. Even though latitude calculations were well

understood by 300BC, the technology for longitude (you need to know the exact time) was not available in 1700.

That’s when Naval/Maritime organizations started pushing clock manufacturers to develop better shipboard

timing devices. Most of the credit for solving this problem goes to the English clockmakers James and John

Harrison for their development of the first accurate shipboard chronometers (1735-1760). These devices (called

Sea Clocks) gradually improved until they were superseded by the Long Range Navigation (LORAN) system

established in the 1940s to broadcast “Navy time” signals. The current version (LORAN-C) is still in used by

ships/planes to plot their position (triangulation of timing signals from multiple known broadcast points).

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BOTC-TEG-6720 In the late 1980s, most Service Provider/Telco networks established a timing architecture to support equipment

that requires synchronization (Lucent 5ESS or Nortel DMS-100 Class 5 switch, various Sonet NEs, Alcatel Litespan,

D4 channel banks, etc). Timing origination units were placed in centralized locations to feed stratum 2 or 3 CO

BITS distribution systems within a region. Many of the centralized units had roof antennas so timing could be

obtained from LORAN broadcasts. At the same time, the United States was establishing a new stratum 1 rated

Global Positioning System (GPS) to support navigation requirements. GPS is a network of 24 satellites (ground

based receivers can plot their position via timing signals) that is monitored by the Navy and corrected daily using a

transmitter at Falcon Air Force base in Colorado. As GPS matured, Service Providers/Telcos first started to use it

as a regional timing source (section 3 part A) and then for individual COs (section 3 part B, C) as the cost of rack

mount GPS units decreased. Symmetricom TS3500 and TP1100 (rack mount source, mini-distribution, switch

retimer unit with roof antenna, see BOTC-TEG-6700) are current examples of GPS systems. Symmetricom TC4500

(see BOTC-TEG-6740) has the advantage of full independence (generates it’s own stratum 1 rated signal) but the

internal cesium service life (about 11 to 12 years) may be an issue for some Service Providers/Telcos. TC4500 unit

cost is higher than GPS units but overall deployment costs are similar since GPS units require extra material and

installation labor (wall or roof antenna, lightning suppressor ground, coax run from antenna to rack mount unit).

5. System connection details:

A) Power for TS3500 shelf:

Step 1 (intra-rack wiring): Connect redundant load -48VA, RTNA (TB1) and -48VB, RTNB (TB2) screws to rack

fuse panel GMT output positions using 20 AWG Black/Red-Black wire pair (see BOTC-SEG-0700 section 8). Use

Red-Black for -48V and Black for RTN. Provide Thomas & Betts (or generic equivalent) RA18-6 ring terminals for

shelf end and RA484 for fuse panel end. TS3500 normally mounts in BITS equipment rack with Telect 0HPGMT

series fuse panel.

Step 2 (fuse panel fuses and designation pins): Maximum drain is 0.75 amps but there is a temporary surge to 2

amps during the power up stage (use 0.75 value on office record drain table). Fuse externally at 3 amps. See

BOTC-SEG-0500 section 14 for GMT fuse and designation pin part numbers.

B) Chassis ground for TS3500 shelf:

Step 1 (intra-rack wiring): Connect TB1 ground symbol screw to relay rack ground using spare 20 AWG Black

wire from part A. Provide Thomas & Betts (or generic equivalent) RA18-6 ring terminal for shelf end. No

connection required for TB2 ground symbol screw since internally common with TB1 ground screw.

C) Ethernet TL1 remote management for TS3500 shelf:

This is the first choice method for remote management (see part D for second choice RS232 method if Ethernet

hub equipment not available in CO).

Step 1 (external remote management cable): Run electrical Ethernet cable with straight pinning (see BOTC-

SEG-0100 section 10) from TS3500 shelf ETHERNET RJ45 port (pin 1 is TX+, pin 2 TX-, pin 3 RX+, pin 6 RX-) to CO

Remote management Ethernet hub equipment port.

D) RS232 TL1 remote management for TS3500 shelf:

This is an alternate second choice method for remote management (see part C for first choice Ethernet method).

Step 1 (external remote management cable): Run Applied Innovation (www.appliedinnovation.com) CAB469-

XXX cable (-XXX denotes footage) from TS3500 shelf COM1 RS232 port (DB25 female, DTE rated, pin 2 is TXD, pin

3 RXD, pin 4 RTS, pin 5 CTS, pin 7 SIG GND, pin 20 DTR) to CO Remote management AI Switch DP232-23 (asynch)

port. See BOTC-SEG-0100 section 11.

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http://www.appliedinnovation.com/

BOTC-TEG-6720 E) Timing outputs for TS3500 shelf:

Step 1 ( external timing cables): See BOTC-SEG-0100 section 9 for methods. Run two single pair timing cables

from shelf T1 OUT wire wrap pins to MINI-DSX panel (see item M connection detail) in same rack. Connect

primary pair to A-T (Tip lead), A-R (Ring lead) pins and secondary pair to B-T, B-R pins. Connect drain wire for

each cable to associated A-S or B-S pin (cables are hard grounded at TS3500 end). The total length of these timing

circuits (TS3500 to MINI-DSX to BITS master shelf input) is limited to 655’.

Part F, G and H are the wall antenna method. If a roof antenna is used, skip to part J.

F) Wall antenna:

Step 1 (consult with Service Provider/Telco): Engineering vendors should consult with Service Provider/Telco

personnel about antenna placement location on outside CO wall and building entry methods (hole size, location)

for the antenna coax stub.

Step 2 (mount antenna): Mount 070-00383-02 bracket and 112-00013-01 antenna on outside CO wall per

manufacturer instructions.

Step 3 (route coax stub): Route 19’ or 6’ (see section 2 part B) coax stub through hole in CO wall to optional

lightning suppressor (part G) or IF unit (part H). Leave drip loop in coax stub between antenna and outside wall

hole entry (prevents moisture from entering CO).

G) Optional lightning suppressor for wall antenna:


personnel about the need for this lightning suppressor (normally not required for wall antenna). If required,

mounting location and far end ground point (for step 3 wire) must be determined.

Step 2 (mount lightning suppressor): Mount 070-00300-03 bracket and 143-00018-02 lightning suppressor.

Step 3 (ground wire): Provide 1 two hole lug (No.10 studs on .625” centers) for ground wire connection to

suppressor. Run one 6 AWG wire (see BOTC-SEG-0700 section 9) from suppressor to far end ground point.

Step 4 (coax from wall antenna): Connect coax stub (from part F step 3) to one of the two SMA connectors on

suppressor.

Step 5 (coax to IF unit): Factory formed coax assembly (10’ long RG316 with SMA connectors on both ends) is

provided with suppressor kit per section 2 part C. Connect one end to remaining SMA connector on suppressor

and route coax to IF unit location (part H).

H) IF unit for wall antenna:


personnel about IF unit placement location.

Step 2 (mount IF unit): Mount associated bracket and 090-72050-71 IF unit.

Step 3 (coax from lightning suppressor): Connect coax (from part G step 5) to SMA connector on IF unit.

Step 4 (coax to TS3500 shelf): Run single conductor RG59/U coax (with TNC connectors on both ends) from IF

unit TNC connector to TS3500 shelf (part L step 1). Length limit is 1000’. BOTC recommends Talley

Communications (www.talleycom.com) part number G59G-XXX (plenum rated RG59/U coax with factory formed

TNC connectors on both ends, XXX denotes footage). Symmetricom factory formed version not recommended due

to high cost, length availability and shipping interval issues. For long term reliability, use a TNC tightener tool

(ADC TT-1000 for example) instead of hand tightening.

Part J and K are the roof antenna method. If a wall antenna is used, skip to part L.

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http://www.talleycom.com/

BOTC-TEG-6720 J) Roof antenna:


personnel about antenna placement location on CO roof and building entry methods (hole size, location) for the

step 3 antenna coax run.

Step 2 (mount antenna): Mount 070-72010-76 mast and 090-72010-97 antenna on CO roof per manufacturer

instructions.

Step 3 (coax to lightning suppressor): Run single conductor RG59/U coax (with TNC connectors on both ends)

from antenna pigtail TNC connector to lightning suppressor (part K). Overall length limit (antenna to suppressor

to TS3500 shelf) is 1000’. BOTC recommends Talley Communications (www.talleycom.com) part number G59G-

XXX (plenum rated RG59/U coax with factory formed TNC connectors on both ends, XXX denotes footage).

Symmetricom factory formed version not recommended due to high cost, length availability and shipping interval

issues. For long term reliability, use a TNC tightener tool (ADC TT-1000 for example) instead of hand tightening.

K) Lightning suppressor for roof antenna:


personnel about mounting location and far end ground point (for step 3 wire) for this lightning suppressor.

Step 2 (mount lightning suppressor): Mount 070-00300-02 bracket and 143-00018-01 lightning suppressor.

Step 3 (ground wire): Provide 1 two hole lug (No.10 studs on .625” centers) for ground wire connection to

suppressor. Run one 6 AWG wire (see BOTC-SEG-0700 section 9) from suppressor to far end ground point.

Step 4 (coax from roof antenna): Connect coax (from part J step 3) to one of the two TNC connectors on

suppressor. For long term reliability, use a TNC tightener tool (ADC TT-1000) instead of hand tightening.

Step 5 (coax to TS3500 shelf): Run single conductor RG59/U coax (with TNC connectors on both ends) from

remaining TNC connector on lightning suppressor to TS3500 shelf (part L step 1). Overall length limit (antenna to

suppressor to TS3500 shelf) is 1000’. BOTC recommends Talley Communications (www.talleycom.com) part

number G59G-XXX factory formed coax assembly.

L) Antenna input for TS3500 shelf:

Step 1 (coax connection): Connect coax from IF unit (part H step 4) or lightning suppressor (part K step 5) to

shelf GPS ANT connector. A 90 degree TNC adapter is included with the shelf to reduce rear projection. To ensure

long term reliability, use a TNC tightener tool (ADC TT-1000 for example) instead of hand tightening.

M) Timing connections for MINI-DSX panel: Each module on the MINI-DSX panel has eight columns of eight pins on the rear side associated with the eight front

side jack circuits. Four pins in each column are located on the CABLE TB and designated OUT A (T), OUT B (R), IN

D (T), IN E (R). The other four pins in each column are located on the CROSS CONNECT TB and designated OUT A

(TN), OUT B (RN), IN C (TN), IN D (RN). Pin column 1 is used for primary timing and pin column 2 is used for

secondary timing.

Step 1 (connect input cables): If TS3500 shelf is located in this CO, connect cables from part E to CABLE TB pins

OUT A (T) for Tip lead and OUT B (R) for Ring lead. If this is a non-TS3500 CO (see section 3 part C), connect cables

from Sonet node timing output circuit to same MINI-DSX pins. Do not ground cables at MINI-DSX end since they

are hard grounded at far end (part E if this is TS3500 CO or per Sonet timing circuit if this is non-TS3500 CO).

Step 2 (add straps): On CROSS CONNECT TB pin columns 1 and 2, add insulated strap wire from OUT A (TN) to IN

C (TN) and from OUT B (RN) to IN D (RN).

Step 3 (connect output cables): Two single pair cables will be run to pin column 1 (primary) and 2 (secondary)

on this MINI-DSX panel per the far end BITS master shelf timing input circuit (BOTC-TEG-6760 Symmetricom

TH5500 for example). For each cable, connect Tip lead to pin IN D (T) and Ring lead to pin IN E (R). Do not ground

cables at MINI-DSX end since they are hard grounded at far end (per BITS master shelf timing input circuit).

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BOTC TEG 6720 Symmetric Om TS3500

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